JP2004129234A - Antenna device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna device capable of being reduced in size and thickness, and realizing a multi-resonance antenna with a simple structure. <P>SOLUTION: A ground plate 21 is a conductive circuit board. A feeding point 22 is provided on one side edge of the ground plate 21, and feeds power to an antenna element 23 connected to the feeding point 22. An antenna element 23 has a length of about 3/8 of an operation frequency band in electric length, is arranged along the external edge of the ground plate 21 from the feeding point 22 within the thickness of the ground plate 21, and is short-circuited to the other side edge different from the side edge where the feeding point 22 is provided. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to an antenna device incorporated in a mobile phone, a mobile radio, and the like.

FIG. 45 is a perspective view showing a configuration of an antenna device incorporated in a conventional mobile phone. In this figure, the antenna device includes a feed point 11, an antenna element 12 fed from the feed point 11, and a ground plane 13 which is a conductive circuit board.

The antenna element 12 mainly has a plate shape. The length of the base plate 13 (base plate length) varies depending on the frequency band of the system to be used, the model of each mobile phone, and the like, but in the 800 MHz band, it is about 3/8 wavelength in most cases. (For example, see Non-Patent Document 1)
Proceedings of the 1975 National Institute of Electrical and Communications Engineers, Optical and Radio Division National Convention, Paper No. 40

However, in the antenna device having the above configuration, it is necessary to provide a space between the ground plane 13 and the antenna element 12 due to structural restrictions, and the device scale of the antenna device has been increased. Further, there is a problem that the band of the antenna is determined by this interval. Furthermore, when realizing a two-resonance or multi-resonance antenna device, there is a problem that the shape of the antenna device must be complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an antenna device that can be reduced in size and thickness and that can realize a multi-resonant antenna with a simple structure.

In order to solve such a problem, the antenna device of the present invention includes a dielectric substrate, a feeding point provided on one side edge of the dielectric substrate, one end connected to the feeding point, and the other end connected to the feeding point. A substantially U-shaped antenna element that is short-circuited to the other side edge of the dielectric substrate, has two parallel sides, and has an electrical length equal to or more than ４ wavelength of the operating frequency band. The configuration provided is adopted.

According to this configuration, the antenna device operates as a transmission line antenna with a short-circuited tip, and can improve the gain and reduce the size and thickness of the antenna device with a simple configuration.

ア ン テ ナ The antenna device of the present invention employs a configuration in which the antenna element is accommodated in a range of the thickness of the dielectric substrate and provided along an outer edge of the dielectric substrate.

According to this configuration, the antenna device can be realized within the range of the thickness of the dielectric substrate, and the gain can be improved and the antenna device can be reduced in size and thickness with a simple configuration.

The antenna device of the present invention employs a configuration in which the antenna element is provided at two parallel sides at a predetermined distance from the dielectric substrate and parallel to the dielectric substrate.

According to this configuration, the gain can be improved and the antenna device can be reduced in size and thickness with a simple configuration.

The antenna device of the present invention is provided such that the dielectric substrate and the dielectric substrate are formed so as to penetrate the dielectric substrate in the thickness direction, and only one end of both ends communicates with the side edge of the dielectric substrate. And a substantially U-shaped slot having an electrical length equal to or longer than ４ wavelength of the operating frequency band, and a substantially U-shaped slot formed in the dielectric substrate by piercing the substantially U-shaped slot. A configuration including a U-shaped antenna element and a feeding point provided in the vicinity of the opening is adopted.

According to this configuration, since one end of the slot is open and the other end of the slot is closed, by supplying power from the opening, the slot is formed by piercing the dielectric substrate and the dielectric substrate is formed. The antenna device can be realized within the thickness range, and the size and thickness of the antenna device can be reduced.

Further, the antenna device of the present invention is characterized in that a dielectric substrate and a hole are formed so as to penetrate the dielectric substrate in a thickness direction, and only one end of both ends is a side edge or an end of the dielectric substrate. A slot which is opened to communicate with the portion, and whose electrical length is equal to or more than ４ wavelength of the second frequency band; an antenna element formed in the dielectric substrate by piercing the slot; A feed point provided in the vicinity of the opening; and a switching element provided in the slot at a position where the electrical length from the opening is equal to or more than ４ wavelength of the first frequency band and short-circuits or opens the antenna element. Is adopted.

According to this configuration, for example, a switching element that allows a current in the first frequency band and does not transmit a current in the second frequency band is provided in the slot, thereby realizing a two-resonance thin antenna device with a simple configuration. Can be.

Further, the antenna device of the present invention is characterized in that a dielectric substrate and a hole are formed so as to penetrate the dielectric substrate in a thickness direction, and only one end of both ends is a side edge or an end of the dielectric substrate. A slot which is opened to communicate with the portion, and whose electrical length is equal to or more than ４ wavelength of the second frequency band; an antenna element formed in the dielectric substrate by piercing the slot; A power supply point provided in the vicinity of the opening, and a position in the slot where the electrical length from the opening is １ ／ wavelength or more of the first frequency band, wherein the second frequency is higher than the first frequency band. And a series resonance circuit having a sufficiently large impedance in a band.

According to this configuration, a two-resonance thin antenna device with a simple configuration can be realized by providing a series resonance circuit in the slot that has a sufficiently large impedance in the second frequency band as compared to the first frequency band.

Further, the antenna device of the present invention is characterized in that a dielectric substrate and a hole are formed so as to penetrate the dielectric substrate in a thickness direction, and only one end of both ends is a side edge or an end of the dielectric substrate. A slot that is opened to communicate with the portion and has an electrical length that is equal to or more than １ ／ wavelength of the lowest frequency band among a plurality of frequency bands used, and that the dielectric substrate is formed by piercing the slot. The formed antenna element, a feeding point provided in the vicinity of the opening, and a position in the slot where the electrical length from the opening is 以上 wavelength or more for each used frequency band in the slot; And a switching element for short-circuiting or opening.

According to this configuration, by providing a plurality of switching elements in the slot, it is possible to realize a thin antenna device corresponding to multiple frequencies with a simple configuration.

Further, the antenna device of the present invention includes a dielectric substrate, which is accommodated in a thickness range of the dielectric substrate, is disposed along the dielectric substrate, and has an electrical length of 以上 wavelength or more of a used frequency band. And a switching element provided at the other end of the antenna element for short-circuiting or opening the antenna element to the dielectric substrate. Take.

According to this configuration, the antenna element is provided along the ground plane length direction on the same plane as the ground plane, and the switching of short-circuiting or opening one end of the antenna element to the ground plane is controlled by “ON” and “OFF” of the switching element. By doing so, it is possible to realize a thin antenna device that can radiate in different radiation patterns.

Further, the antenna device of the present invention is formed such that the dielectric substrate and the dielectric substrate are formed so as to penetrate the dielectric substrate in a thickness direction, and only one end of both ends communicates with a side edge of the dielectric substrate. A slot having an electrical length of not less than １ ／ wavelength of the first frequency band, an antenna element formed on the dielectric substrate by piercing the slot, and a plurality of frequency bands. And a plurality of feed points respectively connected to the corresponding radio circuits and feeding the antenna element, and provided at positions that are at least 1/4 wavelength of the corresponding frequency band from the plurality of feed points in the slot, A switching element for short-circuiting or opening the antenna element.

According to this configuration, by providing a plurality of feed points corresponding to a plurality of frequency bands, a multi-resonant thin antenna device with an arbitrary impedance in each frequency band can be provided even when there is a large difference between the respective frequency bands. Can be realized.

Further, the antenna device of the present invention is formed such that the dielectric substrate and the dielectric substrate are formed so as to penetrate the dielectric substrate in a thickness direction, and only one end of both ends communicates with a side edge of the dielectric substrate. A slot having an electrical length of not less than １ ／ wavelength of the first frequency band, an antenna element formed on the dielectric substrate by piercing the slot, and a plurality of frequency bands. And a plurality of feed points respectively connected to the corresponding radio circuits and feeding the antenna element, and provided at positions that are at least 1/4 wavelength of the corresponding frequency band from the plurality of feed points in the slot, A resonance circuit having a sufficiently low impedance in a predetermined frequency band.

According to this configuration, by providing a plurality of feed points corresponding to a plurality of frequency bands, a multi-resonant thin antenna device with an arbitrary impedance in each frequency band can be provided even when there is a large difference between the respective frequency bands. Can be realized. Further, by providing a resonance circuit having a sufficiently low impedance in a predetermined frequency band in the slot, a plurality of frequency bands can be easily switched, so that a simpler configuration can be achieved.

The antenna device of the present invention employs a configuration in which the antenna element is any one of a linear antenna element, an L-shaped antenna element, and a substantially U-shaped antenna element.

According to this configuration, when the antenna element is a linear antenna element, the simplest structure can be achieved. When the antenna element is an L-shaped antenna element, both horizontal and vertical polarization components can be radiated. When the antenna element is a substantially U-shaped antenna element, a two-element array antenna can be realized. In addition, among these antenna element shapes, any desired shape can be used.

Further, the antenna device of the present invention includes a dielectric substrate, a plurality of antenna elements that are accommodated within a thickness range of the dielectric substrate, and are arranged along the dielectric substrate, and a gap between each antenna element. A connected coil, a feed point provided at one end of the antenna element to which the coil is not connected, and a switching element provided at one end of each antenna element remote from the feed point, The coil is set so that the impedance is sufficiently large in a predetermined frequency band in each of the frequency bands to be used as compared with the other frequency bands, and each antenna element has an electrical length from a feeding point including the coil. , Each of which has a length that is equal to or more than １ ／ wavelength of a frequency band to be used, and wherein the switching element short-circuits or opens the antenna element to the dielectric substrate. The take.

According to this configuration, it is possible to realize a thin antenna device that can radiate radiation patterns different from each other for a plurality of frequency bands.

Further, the antenna device of the present invention includes a dielectric substrate, a plurality of antenna elements that are accommodated within a thickness range of the dielectric substrate, and are arranged along the dielectric substrate, and a gap between each antenna element. Connected to a coil set to have a sufficiently large impedance compared to other frequency bands in a predetermined frequency band, and connected to a radio circuit corresponding to each frequency band, and provided at one end of the antenna element. A plurality of feed points, and the antenna element and the coil are respectively provided at one end of the antenna element whose total length including the coil is １ ／ wavelength or more of the corresponding frequency band from the position of the feed point, and the antenna element is short-circuited or And a switching element to be opened.

According to this configuration, since one end of the antenna element is short-circuited or opened by switching the switching element, it is possible to realize a multi-resonant thin antenna device that can radiate in different radiation patterns.

The antenna device of the present invention employs a configuration in which the whole shape of the plurality of antenna elements and the coil connected is any one of a straight line, an L shape, and a substantially U shape.

According to this configuration, there is provided a thin antenna device that radiates radiation patterns having different radiation patterns in a plurality of frequency bands regardless of whether the overall shape of the antenna element and the coil is linear, L-shaped, or substantially U-shaped. Since it can be realized, a shape according to need can be used.

The antenna device of the present invention is provided such that the dielectric substrate and the dielectric substrate are formed so as to penetrate the dielectric substrate in the thickness direction, and only one end of both ends communicates with the side edge of the dielectric substrate. And an L-shaped, C-shaped, or U-shaped slot whose electric length is equal to or longer than ４ wavelength of the used frequency band, and the slot is formed by drilling the slot. A structure comprising: an antenna element formed on a dielectric substrate; a feeding point provided in the vicinity of the opening; and a changeover switch provided at an arbitrary position in the slot and short-circuiting or opening the antenna element. Take.

According to this configuration, by controlling the changeover switch for short-circuiting or opening the antenna element, the position where the antenna element is short-circuited to the dielectric substrate serving as the ground plane changes, so that a different radiation pattern can be formed.

The antenna device of the present invention employs a configuration including: a determination unit that determines a state of a radio wave received by the antenna element; and a control unit that controls the changeover switch based on a determination result of the determination unit. .

According to this configuration, by controlling the changeover switch based on the result of determining the state of the radio wave received by the antenna element, it is possible to form a radiation pattern with a good radio wave state.

The antenna device of the present invention is a dielectric film that is a film-shaped dielectric, and is provided so as to penetrate the dielectric film in the thickness direction, and only one end of both ends is on the side of the dielectric film. A substantially U-shaped slot which is opened so as to communicate with an edge portion and has an electrical length equal to or more than 使用 wavelength of a used frequency band; A configuration including a substantially U-shaped antenna element formed on a film and a feeding point provided near the opening is adopted.

According to this configuration, an antenna device that is reduced in size and thickness can be realized by a dielectric film, and if the dielectric film is attached to a housing of a mobile phone or the like, the antenna device can be more easily provided. can do.

The antenna device of the present invention is a dielectric film that is a film-shaped dielectric, and is provided so as to penetrate the dielectric film in the thickness direction, and only one end of both ends is on the side of the dielectric film. An L-shaped, C-shaped, or U-shaped slot that is opened to communicate with the edge and has an electrical length of 波長 wavelength or more of the operating frequency band; An antenna element formed on the dielectric film by being provided; a feeding point provided near the opening; and a changeover switch provided at an arbitrary position in the slot to short-circuit or open the antenna element. Are adopted.

According to this configuration, an antenna device that forms a different radiation pattern by controlling the changeover switch can be realized with a dielectric film, and this dielectric film can be more easily attached to a casing of a mobile phone or the like. The antenna device can be provided.

As described above, according to the present invention, a substantially U-shaped antenna element having an electric length equal to or more than １ ／ wavelength of the used frequency band and having element parts parallel to each other is disposed close to the dielectric substrate. By arranging and feeding power from one end of the antenna element and short-circuiting the other end, it is possible to realize a two-element array antenna. it can.

Further, the antenna element whose electric length is equal to or more than １ ／ wavelength of the operating frequency band is contained within the range of the thickness of the substrate serving as the ground plane, the antenna element is arranged along the substrate, and power is supplied from one end of the antenna element. By short-circuiting the other end, the antenna device can be realized within the range of the thickness of the substrate serving as the ground plate, and the size and thickness of the antenna device can be reduced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a plan view showing the configuration of the antenna device 20 according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing a configuration of antenna device 20 according to Embodiment 1 of the present invention. In these figures, the ground plane 21 is a conductive circuit board.

The feed point 22 is provided on one side edge of the base plate 21 and feeds a substantially U-shaped antenna element 23 connected to the feed point 22.

The substantially U-shaped antenna element 23 has an electrical length from the feeding point 22 (hereinafter, referred to as “electric length”) having a length of about ／ wavelength of a used frequency band. Within the range, it is arranged along the outer edge of the main plate 21 from the feeding point 22 and is short-circuited to the other side edge different from the side edge where the feeding point 22 is provided.

As described above, according to the present embodiment, the antenna element is arranged along the outer edge of the ground plane from the feeding point within the range of the thickness of the ground plane, and the side edge different from the side edge provided with the feeding point is provided. By short-circuiting the antenna device, the antenna device can be realized within the range of the thickness of the circuit board serving as the ground plane, and the gain can be improved and the antenna device can be reduced in size and thickness with a simple configuration.

In the present embodiment, the total length of the antenna element is set to about ／ wavelength of the used frequency band from the feed point, but any value may be used as long as it is not less than 以上 wavelength.

(Embodiment 2)
FIG. 3 is a perspective view showing a configuration of an antenna device 50 according to Embodiment 2 of the present invention. However, in this figure, parts common to FIGS. 1 and 2 are denoted by the same reference numerals as in FIG. 1, and detailed description thereof will be omitted.

The antenna element 51 has an electrical length from the feeding point 22 and a length of about ／ wavelength of the operating frequency band, extends a predetermined distance from the feeding point 22 in the thickness direction of the ground plane 21, and is separated from the ground plane 21 by a predetermined distance. And is short-circuited to the other side edge different from the side edge where the feeding point 22 is provided.

Next, the operation of the antenna device having the above configuration will be described. Since the antenna device 50 is a transmission line antenna having a short-circuited tip, the current is maximum at the short-circuited portion, and the current flows toward the feeding point 22. On the other hand, at a position where the electrical length is １ ／ wavelength away from the short-circuit portion in the operating frequency band, the direction of current flow is reversed, and current flows from the short-circuit portion toward the power supply point 22.

As described above, according to the present embodiment, by arranging the antenna elements in a substantially U-shape within a plane separated from the ground plane by a predetermined distance, the gain can be improved with a simple configuration, and the antenna device can be reduced in size and thickness. be able to.

In the present embodiment, the total length of the antenna element is set to about ／ wavelength of the used frequency band from the feed point, but any value may be used as long as it is not less than 以上 wavelength.

(Embodiment 3)
FIG. 4 is a plan view showing a configuration of the antenna device 100 according to Embodiment 3 of the present invention. FIG. 5 is a perspective view showing a configuration of antenna device 100 according to Embodiment 3 of the present invention. In these figures, the base plate 101 is a conductive circuit board, and has a substantially U-shaped slot 102 penetrating the base plate 101 in the thickness direction. The substantially U-shaped antenna element 104 is formed on the main plate 101 by piercing the slot 102.

At one end of the slot 102, an opening is formed in a part of the side surface of the base plate 101, and a feeding point 103 for feeding power to the antenna element 104 is provided near the opening. The entire length of the slot 102 from the opening is an electrical length, which is about 3/8 wavelength of the used frequency band. The other end of the slot 102 is closed (hereinafter, referred to as “closed end”).

略 Thus, the substantially U-shaped antenna element 104 formed by drilling the slot 102 in the base plate 101 operates as a transmission line antenna with a short-circuited tip.

Next, the operation of the antenna device 100 having the above configuration will be described. Since the antenna device 100 is a transmission line antenna with a short-circuited tip, the current is maximum at the short-circuited portion at the tip, that is, at the closed end, and the current flows toward the opening. On the other hand, at a position where the electrical length is １ ／ wavelength away from the used frequency band from the closed end, the direction of current flow is reversed, and current flows from the opening toward the closed end.

As described above, according to the present embodiment, by forming the substantially U-shaped slot, a substantially U-shaped antenna element is formed in the ground plane, and power is supplied to the antenna element through the opening of the slot, whereby the ground plane is formed. The antenna device can be realized within the range of the thickness of the circuit board to be formed, and the gain can be improved and the antenna device can be reduced in size and thickness with a simple configuration.

In the present embodiment, the entire length of the substantially U-shaped slot is set to about ／ wavelength of the used frequency band from the opening, but may take any value as long as it is between 以上 wavelength or more.

(Embodiment 4)
FIG. 6 is a plan view showing a configuration of an antenna device 200 according to Embodiment 4 of the present invention. FIG. 7 is a perspective view showing a configuration of an antenna device 200 according to Embodiment 4 of the present invention. In these figures, the base plate 201 is a conductive circuit board, and has a straight slot 202 penetrating in the thickness direction of the base plate 201. One end of the linear slot 202 has an opening formed at one end of the base plate 201, and a feed point 203 for feeding power to the base plate 201 is provided near the opening. The other end of the slot 202 is closed.

The linear slot 202 is provided in parallel with the main plate length direction. The electric length of the linear slot 202 from the opening is about ／ of the wavelength of the second frequency band (frequency band lower than the first frequency band). Further, the switching element 204 is provided at a position where the electrical length is about ／ of the wavelength of the first frequency band from the opening. Further, the linear antenna element 205 is formed on the main plate 201 by piercing the linear slot 202.

The switching element 204 is turned on in the first frequency band, short-circuits the linear antenna element 205, turned off in the second frequency band, and switches to cancel the short circuit of the linear antenna element 205. And

When the switching element 204 is "ON", the linear antenna element 205 is short-circuited at the position of the switching element 204, so that the antenna device 200 operates as a transmission line antenna having an electrical length corresponding to the first frequency band from the opening. , And emits a radio wave of a first frequency band. When the switching element 204 is “OFF”, the antenna device 200 operates as a transmission line antenna having an electrical length corresponding to the second frequency band from the opening, and emits a radio wave of the second frequency band.

As described above, according to the present embodiment, by providing the switching element in the linear slot, a two-resonance thin antenna device can be realized with a simple configuration.

In the present embodiment, the installation position of the switching element is set such that the electrical length from the opening is about 3/8 wavelength of the first frequency band, and the entire length of the linear slot is set to be 3/3 of the electrical length from the opening in the second frequency band. Although the wavelength is set at about / 8 wavelength, any value may be used as long as it is not less than 1/4 wavelength of the first frequency band and the second frequency band.

(Embodiment 5)
FIG. 8 is a plan view showing a configuration of an antenna device 300 according to Embodiment 5 of the present invention. FIG. 9 is a perspective view showing a configuration of an antenna device 300 according to Embodiment 5 of the present invention. In these figures, the ground plate 301 is a conductive circuit board, and has an L-shaped slot 302 penetrating in the thickness direction of the ground plate 301. In addition, one end of the L-shaped slot 302 has an opening formed on one side edge of the base plate 301, and a feed point 303 for feeding power to the base plate 301 is provided at the opening. The other end of the slot 302 is closed.

The straight portions of the L-shaped slot 302 are provided in parallel with the length direction and the width direction of the base plate, respectively. The electrical length of the L-shaped slot 302 from the opening is the second frequency band (from the first frequency band). (Low frequency band) is about 3/8 of the wavelength. The switching element 304 is provided at a position where the electrical length is about ／ of the wavelength of the first frequency band from the opening. Further, the L-shaped antenna element 305 is formed on the main plate 301 by piercing the L-shaped slot 302.

The switching element 304 is switched “ON” in the first frequency band, short-circuits the L-shaped antenna element 305, and is switched “OFF” in the second frequency band, to release the short-circuit of the L-shaped antenna element 305. Assumed to be performed.

When the switching element 304 is "ON", the L-shaped antenna element 305 is short-circuited at the position of the switching element 304, so that the antenna device 300 operates as a transmission line antenna having an electrical length corresponding to the first frequency band from the opening. Then, a radio wave of the first frequency band is radiated. When the switching element 304 is “OFF”, the antenna device 300 operates as a transmission line antenna having an electrical length corresponding to the second frequency band from the opening, and radiates radio waves in the second frequency band.

{Circle around (4)} Since the L-shaped antenna element 305 is formed in the length direction and width direction of the ground plane, the antenna device 300 radiates both vertical and horizontal polarization components.

As described above, according to the present embodiment, by forming the L-shaped slot, the L-shaped antenna element 305 is formed on the base plate, and the switching element is provided in the L-shaped slot, so that a simple configuration is provided. Thus, a two-resonance thin antenna device that emits both vertical and horizontal polarization components can be realized.

In the present embodiment, the installation position of the switching element is set such that the electrical length from the opening is about 波長 wavelength of the first frequency band, and the entire length of the L-shaped slot is the electrical length from the opening in the second frequency band. The wavelength is set to about wavelength, but any value may be used as long as it is between １ ／ wavelength or more of the first frequency band and the second frequency band.

(Embodiment 6)
FIG. 10 is a plan view showing a configuration of an antenna device 400 according to Embodiment 6 of the present invention. However, in this figure, portions common to FIG. 4 are denoted by the same reference numerals as in FIG. 4, and detailed description thereof will be omitted.

The electrical length of the slot 102 on the substantially U-shaped portion from the opening is about ／ of the wavelength of the second frequency band (frequency band lower than the first frequency band). The switching element 401 is provided at a position where the electrical length is about ／ of the wavelength of the first frequency band from the opening.

The switching element 401 is turned “ON” in the first frequency band, short-circuits the substantially U-shaped antenna element 104, is turned “OFF” in the second frequency band, and releases the short-circuit of the substantially U-shaped antenna element 104. Switching is performed.

When the switching element 401 is "ON", the substantially U-shaped antenna element 104 is short-circuited at the position of the switching element 401, so that the antenna device 400 is a transmission line antenna having an electrical length corresponding to the first frequency band from the opening. It operates and emits radio waves in the first frequency band. When the switching element 401 is “OFF”, the antenna device 400 operates as a transmission line antenna having an electrical length corresponding to the second frequency band from the opening, and emits a radio wave of the second frequency band.

According to the present embodiment, by providing the switching element in the substantially U-shaped slot, a two-resonance thin antenna device having a simple configuration can be realized.

In the present embodiment, the installation position of the switching element is set such that the electrical length from the opening is about 波長 wavelength of the first frequency band, and the entire length of the U-shaped slot is the electrical length from the opening in the second frequency band. The wavelength is set to about wavelength, but any value may be used as long as it is between １ ／ wavelength or more of the first frequency band and the second frequency band.

(Embodiment 7)
FIG. 11 is a plan view showing a configuration of an antenna device 500 according to Embodiment 7 of the present invention. However, in this figure, parts common to FIG. 6 are denoted by the same reference numerals as in FIG. 7, and detailed description thereof will be omitted.

直列 In the linear slot 202, the series resonance circuit 501 is provided at a position where the electrical length from the opening is about ／ of the wavelength of the first frequency band (frequency band higher than the second frequency band).

The series resonance circuit 501 is set so that the impedance becomes “0” in the first frequency band and becomes infinite in the second frequency band. Here, the impedance “0” does not need to be strictly “0”, but may be close to “0”. The infinite impedance is a sufficiently large impedance.

Here, a case where the antenna device 500 corresponds to the first frequency band or the second frequency band will be described. First, when corresponding to the first frequency band, the impedance of the series resonance circuit 501 becomes “0”, and the antenna device 500 has a position where the electrical length from the opening is about ／ of the wavelength of the first frequency band, that is, At the position of the series resonance circuit 501, the linear antenna element 205 operates as a short-circuited transmission line antenna. Next, when corresponding to the second frequency band, the impedance of the series resonance circuit 501 becomes infinite, and the antenna device 500 has a straight line from the opening at a position where the electrical length is about ／ of the wavelength of the second frequency band. The antenna element 205 operates as a short-circuited transmission line antenna.

Thereby, it is possible to automatically switch between the two frequencies without switching the switching element 204 used in the above-described second embodiment.

As described above, according to the present embodiment, by providing the series resonance circuit in the linear slot, a two-resonance thin antenna device with a simple configuration can be realized.

In the present embodiment, the installation position of the series resonance circuit is set such that the electrical length from the opening is about ／ wavelength of the first frequency band, and the entire length of the linear slot is the electrical length from the opening in the second frequency band. The wavelength is set to about wavelength, but any value may be used as long as it is between １ ／ wavelength or more of the first frequency band and the second frequency band.

(Embodiment 8)
FIG. 12 is a plan view showing a configuration of an antenna device 600 according to Embodiment 8 of the present invention. However, in this figure, the same reference numerals as in FIG. 8 denote the same parts as in FIG. 8, and a detailed description thereof will be omitted.

In the L-shaped slot 302, a series resonance circuit 601 is provided at a position where the electrical length from the opening is about ／ of the wavelength of the first frequency band (frequency band higher than the second frequency band).

The series resonance circuit 601 is set so that the impedance becomes “0” in the first frequency band and becomes infinite in the second frequency band. Here, the impedance “0” does not need to be strictly “0”, but may be close to “0”. The infinite impedance is a sufficiently large impedance.

Here, a case where the antenna device 600 corresponds to the first frequency band or the second frequency band will be described. First, when corresponding to the first frequency band, the impedance of the series resonance circuit 601 becomes “0”, and the antenna device 600 has a position where the electrical length from the opening is about ／ of the wavelength of the first frequency band, that is, At the position of the series resonance circuit 601, the L-shaped antenna element 305 operates as a short-circuited transmission line antenna. Next, when the antenna device 600 corresponds to the second frequency band, the impedance of the series resonance circuit 601 becomes infinite and the electric length from the opening is about 3/8 of the wavelength of the second frequency band. The letter-shaped antenna element 305 operates as a short-circuited transmission line antenna.

This makes it possible to automatically switch between the two frequencies without switching the switching element 304 used in the third embodiment described above.

In addition, since the L-shaped antenna element 305 of the antenna device 600 is formed in the length direction and the width direction of the ground plane, it radiates both vertical and horizontal polarization components.

As described above, according to the present embodiment, by providing a series resonance circuit in an L-shaped slot, a two-resonance thin antenna device that radiates both vertical and horizontal polarization components with a simple configuration is realized. Can be.

In the present embodiment, the installation position of the series resonance circuit is set such that the electrical length from the opening is about ／ wavelength of the first frequency band, and the entire length of the L-shaped slot is the electrical length from the opening to the second frequency band. Of the first frequency band and the second frequency band, respectively, may be any value as long as it is not less than 1/4 wavelength.

(Embodiment 9)
FIG. 13 is a plan view showing a configuration of an antenna device 700 according to Embodiment 9 of the present invention. However, in this figure, the same reference numerals as in FIG. 4 denote the same parts as in FIG. 4, and a detailed description thereof will be omitted.

ス ロ ッ ト A series resonance circuit 701 is provided in the substantially U-shaped slot 102 at a position where the electrical length from the opening is about ／ of the wavelength of the first frequency band (frequency band higher than the second frequency band).

The series resonance circuit 701 is set so that the impedance becomes “0” in the first frequency band and becomes infinite in the second frequency band. Here, the impedance “0” does not need to be strictly “0”, but may be close to “0”. The infinite impedance is a sufficiently large impedance.

Here, a case where the antenna device 700 corresponds to the first frequency band or the second frequency band will be described. First, when corresponding to the first frequency band, the impedance of the series resonance circuit 701 becomes “0”, and the antenna device 700 is approximately at a position where the electrical length from the opening is about ／ of the wavelength of the first frequency band. The U-shaped antenna element 104 operates as a short-circuited transmission line antenna. Next, when corresponding to the second frequency band, the impedance of the series resonance circuit 701 becomes infinite, and the antenna device 700 is substantially at a position where the electrical length from the opening is about ／ of the wavelength of the second frequency band. The U-shaped antenna element 104 operates as a short-circuited transmission line antenna.

This makes it possible to automatically switch between two frequencies without switching the switching element 401 used in the above-described sixth embodiment.

As described above, according to the present embodiment, by providing the series resonance circuit in the substantially U-shaped slot, it is possible to realize a two-resonance thin antenna device with a simple configuration.

In the present embodiment, the installation position of the series resonance circuit is set such that the electric length from the opening is about ／ wavelength of the first frequency band, and the entire length of the substantially U-shaped slot is the electric length from the opening to the second frequency. Although it is set to be about ／ wavelength of the band, any value may be used as long as it is not less than 以上 wavelength of the first frequency band and the second frequency band.

(Embodiment 10)
FIG. 14 is a plan view showing a configuration of an antenna device 800 according to Embodiment 10 of the present invention. However, in this figure, parts common to FIG. 6 are denoted by the same reference numerals as in FIG. 6, and detailed description thereof will be omitted.

The linear slot 202 has an electric length from the opening of about 3/8 wavelength of the n-th frequency band, and an electric length from the opening of 3 times the wavelength of the first frequency band (frequency band higher than the second frequency band). The first switching element 801-1 is provided at a position of about / 8. Further, the n-1st switching element 801-1 is located at a position where the electrical length is about ／ of the wavelength of the n−1th frequency band (frequency band higher than the nth frequency band: n = 2, 3,...) From the opening. (N-1) are provided.

The switching elements 801-1 to 801-(n−1) perform switching to short-circuit the linear antenna element 205 when “ON” and cancel short-circuiting the linear antenna element 205 when “OFF”.

When the first switching element 801-1 is “ON”, the antenna device 800 is configured such that the linear antenna element 205 is short-circuited at the position of the first switching element 801-1. It operates as a long transmission line antenna. That is, the antenna device 800 emits a radio wave in the first frequency band when power is supplied through the opening. Similarly, when the (n-1) th switching element 801- (n-1) is "ON", the antenna device 800 sets the linear antenna element 205 at the position of the (n-1) th switching element 801- (n-1). Since it is short-circuited, it operates as a transmission line antenna having an electrical length corresponding to the (n-1) th frequency band from the opening. When the (n-1) th switching element 801- (n-1) is "OFF", the antenna device 800 operates as a transmission line antenna having an electrical length corresponding to the nth frequency band from the opening. Note that only the switching element corresponding to the frequency band to be used among the switching elements 801-1 to 801- (n-1) may be turned "ON".

As described above, according to the present embodiment, by providing a plurality of switching elements in a linear slot, it is possible to realize a thin antenna device capable of supporting multiple frequencies with a simple configuration.

In the present embodiment, the total length of the linear slot is set so that the electrical length from the opening is about 3/8 wavelength of the n-th frequency band, and the installation position of the switching element is 3/3 of the electrical length from the opening in each frequency band. Although the wavelength is set to about 8 wavelengths, the total length of the linear slot may take any value as long as it is at least 1/4 wavelength of the nth frequency band, and the installation position of the switching element is 1/4 wavelength of each frequency band. Any value may be taken as long as it is between the above.

(Embodiment 11)
FIG. 15 is a plan view showing a configuration of an antenna device 900 according to Embodiment 11 of the present invention. However, in this figure, the same reference numerals as in FIG. 8 denote the same parts as in FIG. 8, and a detailed description thereof will be omitted.

The L-shaped slot 302 has an electrical length from the opening of about 3/8 wavelength of the n-th frequency band, and an electrical length from the opening of the wavelength of the first frequency band (frequency band higher than the second frequency band). The first switching element 901-1 is provided at a position of about ／. Further, the n-1st switching element 901 is located at a position where the electrical length is about ／ of the wavelength of the n-1th frequency band (frequency band higher than the nth frequency band: n = 2, 3,...) From the opening. (N-1) are provided.

The switching elements 901-1 to 901- (n-1) perform switching to short-circuit the L-shaped antenna element 305 when "ON" and to cancel short-circuiting the L-shaped antenna element 305 when "OFF". .

When the first switching element 901-1 is “ON”, the antenna device 900 corresponds to the first frequency band from the opening because the L-shaped antenna element 305 is short-circuited at the position of the first switching element 901-1. It operates as an electric length transmission line antenna. That is, the antenna device 900 emits a radio wave in the first frequency band when power is supplied through the opening. Similarly, when the (n-1) th switching element 901- (n-1) is "ON", the antenna device 900 moves the L-shaped antenna element 305 at the position of the (n-1) th switching element 901- (n-1). Are short-circuited, and thus operate as a transmission line antenna having an electrical length corresponding to the (n-1) th frequency band from the opening. When the (n-1) th switching element 901- (n-1) is "OFF", the antenna device 900 operates as a transmission line antenna having an electrical length corresponding to the nth frequency band from the opening. Only the switching element corresponding to the frequency band to be used among the switching elements 901-1 to 901- (n-1) may be turned "ON".

ア ン テ ナ Further, since the L-shaped antenna element 305 is formed in the length direction and the width direction of the ground plane, the antenna device 900 radiates both vertical and horizontal polarization components.

As described above, according to the present embodiment, by providing a plurality of switching elements in the L-shaped slot, a thin antenna device compatible with multiple frequencies that radiates both vertical and horizontal polarization components with a simple configuration. Can be realized.

In the present embodiment, the electrical length of the L-shaped slot from the opening is about ／ wavelength of the nth frequency band, and the installation position of the switching element is 3/8 of the electrical length from the opening in the frequency band. Although the wavelength is about the same, the total length of the L-shaped slot may take any value as long as it is at least 1/4 wavelength of the nth frequency band, and the installation position of the switching element is 1/4 wavelength of each frequency band. Any value may be taken as long as it is between the above.

(Embodiment 12)
FIG. 16 is a plan view showing a configuration of an antenna device 1000 according to Embodiment 12 of the present invention. However, in this figure, the same reference numerals as in FIG. 4 denote the same parts as in FIG. 4, and a detailed description thereof will be omitted.

The substantially U-shaped slot 102 has an electrical length from the opening of about ／ wavelength of the n-th frequency band, and an electrical length of the first frequency band (frequency band higher than the second frequency band) from the opening. The first switching element 1001-1 is provided at a position of about ／ of the wavelength. Further, the n-1st switching element 1001- is located at a position where the electrical length is about ／ of the wavelength of the n-1th frequency band (frequency band higher than the nth frequency band: n = 2, 3,...) From the opening. (N-1) are provided.

The switching elements 1001-1 to 1001- (n-1) perform switching to short-circuit the substantially U-shaped antenna element 104 when "ON" and release short-circuiting the substantially U-shaped antenna element 104 when "OFF". And

When the switching element 1001-1 is “ON”, the antenna device 1000 has the electrical length corresponding to the first frequency band from the opening because the substantially U-shaped antenna element 104 is short-circuited at the position of the switching element 1001-1. Operates as a transmission line antenna. That is, the antenna device 1000 emits a radio wave in the first frequency band when power is supplied through the opening. Similarly, when the (n-1) th switching element 1001- (n-1) is "ON", the antenna device 1000 moves the U-shaped antenna element at the position of the (n-1) th switching element 1001- (n-1). Since the short circuit 104 occurs, the antenna 104 operates as a transmission line antenna having an electrical length corresponding to the (n-1) th frequency band from the opening. When the (n−1) th switching element 1001- (n−1) is “OFF”, the antenna device 1000 operates as a transmission line antenna having an electrical length corresponding to the nth frequency band from the opening. Note that only the switching element corresponding to the frequency band to be used among the switching elements 1001-1 to 1001- (n-1) may be turned "ON".

According to the present embodiment, by providing a plurality of switching elements in a substantially U-shaped slot, it is possible to realize a thin antenna device having a simple configuration and supporting multiple frequencies.

In the present embodiment, the entire length of the substantially U-shaped slot is set such that the electrical length from the opening is about ／ wavelength of the n-th frequency band, and the installation position of the switching element is the electrical length from the opening in each frequency band. Although the wavelength is set to about ／ wavelength, the overall length of the substantially U-shaped slot may take any value as long as it is at least １ ／ wavelength of the n-th frequency band. Any value may be used as long as it is between 1/4 wavelength and longer.

(Embodiment 13)
FIG. 17 is a plan view showing a configuration of an antenna device 1100 according to Embodiment 13 of the present invention. In this figure, a ground plane 1101 is a conductive circuit board, and a linear antenna element 1102 is provided within the range of the thickness of the ground plane 1101 along the ground plane length direction.

The linear antenna element 1102 has an electrical length of about ／ wavelength of the used frequency band, has a feed point 1103 at one end, and a switching element 1104 at the other end, and a ground plane 1101 via the switching element 1104. Grounded.

The switching element 1104 performs switching to short-circuit the linear antenna element 1102 and the ground plane 1101 when “ON”, and cancel short-circuit between the linear antenna element 1102 and the ground plane 1101 when “OFF”.

When the switching element 1104 is “OFF”, the antenna device 1100 operates as an inverted L antenna having an open end. When the switching element 1104 is “ON”, the antenna device 1100 operates as a transmission line antenna whose tip is short-circuited.

As described above, according to the present embodiment, within the thickness range of the ground plane, an antenna element is provided along the ground plane length direction, and switching of short-circuiting or opening one end of the antenna element to the ground plane is performed by the switching element. By controlling ON and OFF, a thin antenna device that can radiate in different radiation patterns can be realized.

In the present embodiment, the linear antenna element has an electrical length of about ／ wavelength of the operating frequency band, but may take any value as long as it is between １ ／ wavelength or more.

(Embodiment 14)
FIG. 18 is a plan view showing a configuration of an antenna device 1200 according to Embodiment 14 of the present invention. In this figure, a ground plane 1201 is a conductive circuit board, and an L-shaped antenna element 1202 is provided within the range of the thickness of the ground plane 1201 along the length direction and width direction of the ground plane.

The L-shaped antenna element 1202 has an electric length of about ／ wavelength of the used frequency band, a feed point 1203 at one end and a switching element 1204 at the other end, and a ground plane via the switching element 1204. 1201 is grounded.

The switching element 1204 switches to short-circuit the L-shaped antenna element 1202 and the ground plane 1201 when turned “ON” and to cancel the short-circuit between the L-shaped antenna element 1202 and the ground plane 1201 when turned “OFF”.

場合 When the switching element 1204 is “OFF”, the antenna device 1200 operates as an L-shaped inverted L antenna with an open end. When the switching element 1204 is “ON”, the antenna device 1200 operates as an L-shaped transmission line antenna whose tip is short-circuited.

Note that the antenna device 1200 emits both vertical and horizontal polarized components because the L-shaped antenna element operates as an inverted L antenna or a transmission line antenna.

As described above, according to the present embodiment, an antenna element is provided along the length and width directions of the ground plate within the range of the thickness of the ground plate, and switching is performed such that one end of the antenna element is short-circuited or opened to the ground plate. This is performed by controlling “ON” and “OFF” of the element, whereby a thin antenna device that can radiate in different radiation patterns can be realized.

In the present embodiment, the L-shaped antenna element has an electrical length of about 程度 wavelength of the used frequency band, but may take any value as long as it is between １ ／ wavelength or more.

(Embodiment 15)
FIG. 19 is a plan view showing a configuration of an antenna device 1300 according to Embodiment 15 of the present invention. In this figure, a ground plane 1301 is a conductive circuit board, and is provided so that two sides of a substantially U-shaped antenna element 1302 are located within the thickness range of the ground plane 1301 along the ground plane length direction. I have.

The substantially U-shaped antenna element 1302 has an electric length of about ／ wavelength of the used frequency band, a feeding point 1303 is provided at one end, and a switching element 1304 is provided at the other end. The ground plate 1301 is grounded.

It is assumed that the switching element 1304 is switched to short-circuit the antenna element 1302 and the ground plane 1301 when “ON”, and to cancel the short-circuit between the antenna element 1302 and the ground plane 1301 when “OFF”.

When the switching element 1304 is “OFF”, the antenna device 1300 operates as an inverted-L antenna whose tip is open. When the switching element 1304 is “ON”, the antenna device 1300 operates as a transmission line antenna whose tip is short-circuited.

As described above, according to the present embodiment, a substantially U-shaped antenna element is provided within the range of the thickness of the main plate along the length direction and the width direction of the main plate, and one end of the antenna element is short-circuited or opened to the main plate. The switching of the switching is performed by controlling “ON” and “OFF” of the switching element, thereby realizing a thin antenna device that can radiate in different radiation patterns.

In this embodiment, the substantially U-shaped antenna element has an electrical length of about ３ wavelength of the used frequency band, but may take any value as long as it is not less than １ ／ wavelength.

(Embodiment 16)
FIG. 20 is a plan view showing a configuration of an antenna device 1400 according to Embodiment 16 of the present invention. However, in this figure, portions common to FIG. 17 are denoted by the same reference numerals as in FIG. 17, and detailed description thereof will be omitted. A linear first antenna element 1401 and a linear second antenna element 1402 are provided within the range of the thickness of the ground plane 1101 along the ground plane length direction by connecting a coil 1403 between them. .

The first antenna element 1401 has an electrical length of about ／ wavelength of the first frequency band, a feed point 1103 at one end of the linear first antenna element 1401, and a coil 1403 at the other end. A switching element 1404 is provided.

The coil 1403 is provided between the first antenna element 1401 and the second antenna element 1402, and is set so that the impedance becomes infinite in the first frequency band. Here, the impedance infinity is a sufficiently large impedance.

The second antenna element 1402 has a length whose electric length is about ／ wavelength of the second frequency band (frequency band lower than the first frequency band) including the electric length of the linear first antenna element 1401 and the coil 1403. A coil 1403 is connected to one end, and a switching element 1104 grounded to the ground plane 1101 is provided at the other end.

(4) The switching elements 1104 and 1404 are switched so that the connected antenna element and the ground plane are short-circuited by "ON" and released by "OFF".

When the antenna device 1400 corresponds to the first frequency band, the impedance of the coil 1403 becomes infinite, and the first antenna element 1401 operates. Here, when the switching element 1404 is turned “ON”, it operates as a straight-line short-circuited transmission line antenna, and when the switching element 1404 is turned “OFF”, it operates as a linear inverted L antenna.

When the antenna device 1400 corresponds to the second frequency band, the antenna device 1400, the coil 1403, and the second antenna element 1402 operate as a combined antenna element. Here, when the switching element 1104 is turned “ON”, it operates as a linear short-circuited transmission line antenna, and when the switching element 1104 is “OFF”, it operates as a linear inverted L antenna.

As described above, according to the present embodiment, a two-resonance antenna device can be realized by providing a coil having an infinite impedance in the first frequency band between the first antenna element and the second antenna element. The first antenna element and the second antenna element are each provided with a switching element that is grounded to the ground plane, and by controlling “ON” and “OFF” of the switching element, radiation is performed in a different radiation pattern for each frequency band. And a thin antenna device that can be realized.

In the present embodiment, the total length of the first antenna element is set to about ／ wavelength of the first frequency band, and the total length of the first antenna element and the second antenna element including the coil is set to 3/3 of the second frequency band. The number of wavelengths is about eight, but any value may be used as long as it is between one-quarter wavelength or more of each frequency band.

(Embodiment 17)
FIG. 21 is a plan view showing a configuration of an antenna device 1500 according to Embodiment 17 of the present invention. However, in this figure, portions common to FIG. 18 are denoted by the same reference numerals as in FIG. 18, and detailed description thereof will be omitted. An antenna element corresponding to one side of the L-shape is arranged along the width direction of the main plate within the range of the thickness of the main plate 1201, and an antenna element corresponding to another side is disposed along the length direction of the main plate. I have. The L-shaped antenna element is provided with a first antenna element 1501 and a second antenna element 1502 connected with a coil 1503 therebetween.

The first antenna element 1501 has an electrical length of about ／ wavelength of the first frequency band, a feeding point 1203 at one end of the first antenna element 1501, and a coil 1503 and a switching element at the other end. 1504 is provided.

The coil 1503 is provided between the first antenna element 1501 and the second antenna element 1502, and is set so that the impedance becomes infinite in the first frequency band. Here, the impedance infinity is a sufficiently large impedance.

The second antenna element 1502 has a length such that its electrical length is about ／ wavelength of the second frequency band (frequency band lower than the first frequency band) including the electrical lengths of the first antenna element 1501 and the coil 1503. A coil 1503 is connected to one end, and a switching element 1204 that is grounded to the ground plane 1201 is provided at the other end.

(4) The switching elements 1204 and 1504 perform switching such that the connected antenna element and the ground plane are short-circuited by “ON” and released by “OFF”.

When the antenna device 1500 corresponds to the first frequency band, the impedance of the coil 1503 becomes infinite, and the first antenna element 1501 operates. Here, when the switching element 1504 is turned “ON”, it operates as a short-circuited transmission line antenna, and when the switching element 1504 is “OFF”, it operates as an inverted L antenna.

場合 When the antenna device 1500 corresponds to the second frequency band, an antenna element including the first antenna element 1501, the coil 1503, and the second antenna element 1502 operates. Here, when the switching element 1204 is turned “ON”, it operates as a short-circuited transmission line antenna, and when the switching element 1204 is turned “OFF”, it operates as an L-shaped inverted L antenna.

As described above, according to the present embodiment, a two-resonance antenna device can be realized by providing a coil having an infinite impedance in the first frequency band between the first antenna element and the second antenna element. The first antenna element and the second antenna element are each provided with a switching element that is grounded to the ground plane, and by controlling “ON” and “OFF” of the switching element, radiation is performed in a different radiation pattern for each frequency band. And a thin antenna device that can be realized.

In this embodiment, the first antenna element has an electric length of about ３ wavelength of the first frequency band, and the electric length of the first antenna element including the coil and the second antenna element is equal to the second frequency band. Although the wavelength is set to about ／ wavelength, any value may be used as long as it is between １ ／ wavelength or more of each frequency band.

(Embodiment 18)
FIG. 22 is a plan view showing a configuration of an antenna device 1600 according to Embodiment 18 of the present invention. However, in this figure, parts common to FIG. 19 are denoted by the same reference numerals as in FIG. 19, and detailed description thereof will be omitted. Antenna elements corresponding to two parallel sides of a U-shape are arranged along the length direction of the base plate within the range of the thickness of the base plate 1301, and the other side is arranged along the width direction of the base plate. The antenna element having a substantially U shape as a whole is provided with a first antenna element 1601 and a second antenna element 1602 connected with a coil 1603 between them.

The first antenna element 1601 has an electrical length of about ／ wavelength of the first frequency band, a feed point 1303 at one end of the first antenna element 1601, and a coil 1603 and a switching element at the other end. 1604 is provided.

The coil 1603 is provided between the first antenna element 1601 and the second antenna element 1602, and is set so that the impedance becomes infinite in the first frequency band. Here, the impedance infinity is a sufficiently large impedance.

The second antenna element 1602 has a length such that the electrical length of the second antenna element 1602 including the electrical length of the first antenna element 1601 and the coil 1603 is about ／ wavelength of the second frequency band (frequency band lower than the first frequency band). A coil 1603 is connected to one end, and a switching element 1304 that is grounded to the ground plane 1301 is provided at the other end.

(4) The switching elements 1304 and 1604 are switched to short-circuit the connected antenna element and the ground plane by “ON” and to cancel the short-circuit by “OFF”.

When the antenna device 1600 corresponds to the first frequency band, the impedance of the coil 1603 becomes infinite, and the first antenna element 1601 operates. Here, when the switching element 1604 is turned “ON”, it operates as a short-circuited transmission line antenna, and when the switching element 1604 is turned “OFF”, it operates as an inverted L antenna.

When the antenna device 1600 corresponds to the second frequency band, an antenna element including the first antenna element 1601, the coil 1603, and the second antenna element 1602 operates. Here, when the switching element 1304 is turned “ON”, the antenna operates as a short-circuited transmission line antenna. When the switching element 1304 is turned “OFF”, the antenna operates as a substantially U-shaped inverted L antenna.

As described above, according to the present embodiment, a two-resonance antenna device can be realized by providing a coil having an infinite impedance in the first frequency band between the first antenna element and the second antenna element. The first antenna element and the second antenna element are each provided with a switching element that is grounded to the ground plane, and by controlling “ON” and “OFF” of the switching element, radiation is performed in a different radiation pattern for each frequency band. And a thin antenna device that can be realized.

In this embodiment, the first antenna element has an electric length of about ３ wavelength of the first frequency band, and the electric length of the first antenna element including the coil and the second antenna element is equal to the second frequency band. Although the wavelength is set to about ／ wavelength, any value may be used as long as it is between １ ／ wavelength or more of each frequency band.

(Embodiment 19)
FIG. 23 is a plan view showing a configuration of an antenna device 1700 according to Embodiment 19 of the present invention. However, in this figure, portions common to FIG. 17 are denoted by the same reference numerals as in FIG. 17, and detailed description thereof will be omitted. A coil is connected between the first antenna element 1701-1 to the n-th antenna element 1701-n (n = 2, 3,...) Along the length direction of the ground plate within the range of the thickness of the ground plate 1101. It is provided.

The first antenna element 1701-1 has an electrical length of about ／ wavelength of the first frequency band, a feed point 1103 at one end of the first antenna element 1701-1, and a feed point 1103 at the other end. One switching element 1702-1 and a first coil 1703-1 are provided.

The n-th antenna element 1701-n has an n-th frequency band (i.e., the electrical length of all elements including coils from the first antenna element to the (n-1) -th antenna element 1701- (n-1). (a frequency band lower than the (n-1) frequency band). One end of the n-th antenna element 1701-n closer to the feeding point 1103 is connected to the (n-1) -th coil 1703- (n-1), and the other end is connected to the n-th switching element 1702-n grounded to the ground plane. n is provided.

The first coil 1703-1 is provided between the first antenna element 1701-1 and the second antenna element 1701-2, and is set so that the impedance becomes infinite in the first frequency band. Similarly, the (n-1) th coil 1703-n is provided between the (n-1) th antenna element 1701- (n-1) and the nth antenna element 1701-n, and has an impedance in the (n-1) th frequency band. Is set to be infinite. Here, the impedance infinity is a sufficiently large impedance.

Each switching element performs switching such that the connected antenna element and the ground plane are short-circuited by “ON” and released by “OFF”.

When the antenna device 1700 corresponds to the first frequency band, the impedance of the first coil 1703-1 becomes infinite, and the first antenna element operates. Specifically, when the switching element 1702-1 is turned “ON”, it operates as a linear short-circuited transmission line antenna, and when the switching element 1702-1 is “OFF”, it operates as a linear inverted L antenna.

場合 When the antenna device 1700 corresponds to the n-th frequency band, all elements including the coils from the first antenna element 1701-1 to the n-th antenna element 1701-n operate. Here, when the switching element 1702-n is turned “ON”, it operates as a linear short-circuited transmission line antenna, and when the switching element 1702-n is turned “OFF”, it operates as a linear inverted L antenna.

As described above, according to the present embodiment, the first coil to the (n-1) th coil are connected between the first antenna element to the n-th antenna element, and the impedance in the (n-1) th frequency band is increased. By providing an infinitely large coil, an n-resonance antenna device can be realized. The first to nth antenna elements are respectively provided with switching elements that are grounded to the ground plane, and the switching elements are turned on and off. , It is possible to realize a thin antenna device that can radiate in different radiation patterns for each frequency band.

(Embodiment 20)
FIG. 24 is a plan view showing a configuration of an antenna device 1800 according to Embodiment 20 of the present invention. However, in this figure, portions common to FIG. 18 are denoted by the same reference numerals as in FIG. 18, and detailed description thereof will be omitted. From the first antenna element 1801-1 to the n-th antenna element 1801-n (n = 2, 3) so that the entire antenna element becomes L-shaped along the length direction and width direction of the ground plate in the same plane as ,...) Are provided by connecting coils between the respective elements.

The first antenna element 1801-1 has an electrical length of about ／ wavelength of the first frequency band, a feed point 1203 at one end of the first antenna element 1801-1 and a feed point 1203 at the other end. One switching element 1802-1 and a first coil 1803-1 are provided.

The n-th antenna element 1801-n has an electrical length equal to the electrical length of all the elements including the coils from the first antenna element 1801-1 to the (n-1) -th antenna element 1801- (n-1). It has a length that is about 3/8 wavelength of the band (frequency band lower than the (n-1) th frequency band). One end of the n-th antenna element 1801-n closer to the feeding point 1203 is connected to the (n-1) -th coil 1803- (n-1), and the other end is the n-th switching element 1802 grounded to the ground plane 1201. -N is provided.

The first coil 1803-1 is provided between the first antenna element 1801-1 and the second antenna element 1801-2, and is set so that the impedance becomes infinite in the first frequency band. Similarly, the (n-1) -th coil 1803- (n-1) is provided between the (n-1) -th antenna element 1801- (n-1) and the n-th antenna element 1801-n. The impedance is set to be infinite in the frequency band. Here, the impedance infinity is a sufficiently large impedance.

Each switching element performs switching such that the connected antenna element and the ground plane are short-circuited by “ON” and released by “OFF”.

When the antenna device 1800 corresponds to the first frequency band, the impedance of the first coil 1803-1 becomes infinite, and the first antenna element 1801-1 operates. Here, when the switching element 1802-1 is turned “ON”, the antenna operates as a short-circuited transmission line antenna. When the switching element 1802-1 is turned “OFF”, the antenna operates as an inverted L antenna.

When the antenna device 1800 supports the n-th frequency band, all the elements including the coils from the first antenna element 1801-1 to the n-th antenna element 1801-n operate. Here, when the switching element 1802-n is turned “ON”, the antenna operates as a short-circuited transmission line antenna. When the switching element 1802-n is turned “OFF”, the antenna operates as an inverted L antenna.

As described above, according to the present embodiment, the first coil to the (n-1) th coil are connected between the first antenna element to the n-th antenna element, and the impedance in the (n-1) th frequency band is increased. By providing an infinitely large coil, an n-resonance antenna device can be realized. The first to nth antenna elements are respectively provided with switching elements that are grounded to the ground plane, and the switching elements are turned on and off. , It is possible to realize a thin antenna device that can radiate in different radiation patterns for each frequency band.

(Embodiment 21)
FIG. 25 is a plan view showing a configuration of an antenna device 1900 according to Embodiment 21 of the present invention. However, in this figure, parts common to FIG. 19 are denoted by the same reference numerals as in FIG. 19, and detailed description thereof will be omitted. From the first antenna element to the n-th antenna element (n = 2, 3,...) In the same plane as the ground plane 1301 along the ground plane length direction and the width direction, so that the entire antenna element becomes substantially U-shaped. And a coil connected between the elements.

The first antenna element 1901-1 has an electrical length of about ／ wavelength of the first frequency band, a feed point 1303 at one end of the first antenna element 1901-1, and a feed point 1303 at the other end. One switching element 1902-1 and a first coil 1903-1 are provided.

The n-th antenna element 1901-n has an electrical length equal to the electrical length of all elements including the coil from the first antenna element 1901-1 to the (n-1) -th antenna element 1901- (n-1). It has a length that is about 3/8 wavelength of the band (frequency band lower than the (n-1) th frequency band). One end of the n-th antenna element 1901-n closer to the feeding point 1303 is connected to the (n-1) -th coil 1903- (n-1), and the other end is connected to the n-th switching element 1902- n is provided.

The first coil 1903-1 is provided between the first antenna element 1901-1 and the second antenna element 1901-2, and is set so that the impedance becomes infinite in the first frequency band. Similarly, the (n-1) th coil 1903- (n-1) is provided between the (n-1) th antenna element 1901- (n-1) and the n-th antenna element 1901-n. The impedance is set to be infinite in the frequency band. Here, the impedance infinity is a sufficiently large impedance.

Each switching element performs switching such that the connected antenna element and the ground plane are short-circuited by “ON” and released by “OFF”.

When the antenna device 1900 corresponds to the first frequency band, the impedance of the first coil 1903-1 becomes infinite, and the first antenna element 1901-1 operates. Here, when the switching element 1902-1 is turned “ON”, it operates as a short-circuited transmission line antenna, and when the switching element 1902-1 is turned “OFF”, it operates as an inverted L antenna.

When the antenna device 1900 corresponds to the n-th frequency band, all the elements including the coils from the first antenna element 1901-1 to the n-th antenna element 1901-n operate. Here, when the switching element 1902-n is turned “ON”, it operates as a short-circuited transmission line antenna, and when the switching element 1902-n is turned “OFF”, it operates as an inverted L antenna.

As described above, according to the present embodiment, the first coil to the (n-1) th coil are connected between the first antenna element to the n-th antenna element, and the impedance in the (n-1) th frequency band is increased. By providing an infinitely large coil, an n-resonance antenna device can be realized. The first to nth antenna elements are respectively provided with switching elements that are grounded to the ground plane, and the switching elements are turned on and off. , It is possible to realize a thin antenna device that can radiate in different radiation patterns for each frequency band.

(Embodiment 22)
FIG. 26 is a plan view showing a configuration of an antenna device 2000 according to Embodiment 22 of the present invention. However, in this figure, parts common to FIG. 8 are denoted by the same reference numerals as in FIG. 8, and detailed description thereof will be omitted.

The L-shaped slot 302 has an electrical length equal to or longer than 波長 wavelength of the first frequency band, and a feed point 2001-1 connected to a wireless circuit corresponding to the first frequency band is provided in the opening. The feeding point 2001-1 feeds the L-shaped antenna element 305.

In the L-shaped slot 302, a feeding point 2001-2 connected to a wireless circuit corresponding to a second frequency band higher than the first frequency band is provided, and the feeding point 2001-2 is L-shaped. To the antenna element 305. Further, a switching element 2002 is provided at a position where the electrical length from the feeding point 2001-2 is equal to or longer than １ ／ wavelength of the second frequency band.

(4) The feeding point 2001-2 and the switching element 2002 are arranged so as to take the aspect ratio of the L-shaped slot.

The switching element 2002 is switched to “OFF” in the first frequency band, short-circuits the L-shaped antenna element 305, and switches to “ON” in the second frequency band to release the short-circuit of the L-shaped antenna element 305. Assumed to be performed.

When the switching element 2002 is “OFF”, only the feeding point 2001-1 feeds power to the L-shaped antenna element 305, and the antenna apparatus 2000 operates as a transmission line antenna short-circuited at the closed end, thereby providing the first frequency. Emit radio waves in the band.

On the other hand, when the switching element 2002 is “ON”, the L-shaped antenna element 305 is short-circuited at the position of the switching element 2002. Also, only the feeding point 2001-2 feeds power to the L-shaped antenna element 305, and the antenna device 2000 operates as a short-circuited transmission line antenna that emits radio waves in the second frequency band.

{Circle around (2)} Since the L-shaped antenna element 305 is formed in the length direction and the width direction of the ground plane, the antenna device 2000 radiates both vertical and horizontal polarization components for each of the first and second frequency bands.

As described above, according to the present embodiment, by providing the feeding point corresponding to the first frequency band and the feeding point corresponding to the second frequency band, the case where there is a large difference between the first and second frequency bands However, a thin antenna device having two resonances can be easily realized with an arbitrary impedance in each frequency band.

Embodiment 23
FIG. 27 is a plan view showing a configuration of an antenna device 2100 according to Embodiment 23 of the present invention. However, in this figure, portions common to FIG. 26 are denoted by the same reference numerals as in FIG. 26, and detailed description thereof will be omitted. FIG. 27 differs from FIG. 26 in that the switching element 2002 is replaced with a resonance circuit 2101.

The resonance circuit 2101 has an extremely large impedance in the first frequency band, and is close to an open state of the L-shaped antenna element 305 and the ground plane 301, so it is regarded as an open state. Further, in the second frequency band, the impedance is extremely small, and the L-shaped antenna element 305 is almost in a state of being short-circuited to the ground plane 301, so that it is regarded as a short-circuited state.

Here, a case where the antenna device 2100 corresponds to the first frequency band or the second frequency band will be described. First, when corresponding to the first frequency band, only the feeding point 2001-1 feeds power to the L-shaped antenna element 305, and the impedance of the resonance circuit 2101 becomes extremely large. Therefore, the antenna device 2100 radiates radio waves in the first frequency band by operating as a transmission line antenna short-circuited at the closed end.

{Next, when corresponding to the second frequency band, only the feeding point 2001-2 feeds the L-shaped antenna element 305, and the impedance of the resonance circuit 2101 becomes very small. Therefore, the antenna device 2100 radiates radio waves in the second frequency band by operating as a short-circuited transmission line antenna at the position of the resonance circuit 2101.

As described above, according to the present embodiment, by providing the feeding point corresponding to the first frequency band and the feeding point corresponding to the second frequency band, the case where there is a large difference between the first and second frequency bands However, a thin antenna device having two resonances can be easily realized with an arbitrary impedance in each frequency band. Further, as described in the twenty-second embodiment, a switch for switching to a frequency band corresponding to the antenna device is not required, and switching control of the switch is not required, so that the antenna device is realized with a simpler configuration. be able to.

(Embodiment 24)
FIG. 28 is a plan view showing the configuration of antenna device 2200 according to Embodiment 24 of the present invention. However, in this figure, portions common to FIG. 26 are denoted by the same reference numerals as in FIG. 26, and detailed description thereof will be omitted. FIG. 28 differs from FIG. 26 in that n feeding points and n−1 switching elements are provided. Here, n is an arbitrary positive number of 3 or more.

The feeding points 2201-0 to 2201- (n-1) are provided in the L-shaped slots 302 parallel to the main plate width direction, and are connected to radio circuits corresponding to the first to n-th frequency bands, respectively. Each feeding point feeds the L-shaped antenna element 305. Here, it is assumed that the frequency band increases from the first frequency band to the n-th frequency band.

The switching elements 2202-1 to 2202- (n-1) are provided at positions that are at least 1/4 wavelength of the corresponding frequency band from the feeding points 2201-1 to 2201- (n-1). The positional relationship from the feeding point to the corresponding switching element is set to be the aspect ratio of the L-shaped slot 302. Further, the switching elements 2202-1 to 2202- (n-1) perform switching for short-circuiting the L-shaped antenna element 305 when "ON" and canceling short-circuiting for the L-shaped antenna element 305 when "OFF". And

When all the switching elements are “OFF”, only the feeding point 2201-0 supplies power to the L-shaped antenna element 305, and the antenna device 2200 operates as a transmission line antenna short-circuited at the closed end, so that the first antenna operates. Emit radio waves in the frequency band.

場合 When the switching element 2202-N (N: any one satisfying N ≦ N ≦ n−1) is “ON”, the L-shaped antenna element 305 is short-circuited at the position of the switching element 2202-N. Also, only the feeding point 2201-N feeds the L-shaped antenna element 305, and the antenna device 2200 operates as a short-circuited transmission line antenna that emits radio waves in the Nth frequency band.

Note that since the L-shaped antenna element 305 is formed in the length direction and the width direction of the ground plane, the antenna device 2200 radiates both vertical and horizontal polarization components in each of the first to n-th frequency bands.

According to the present embodiment, by providing the feeding points corresponding to the first to n-th frequencies as described above, it is possible to realize a multi-resonant thin antenna device with an arbitrary impedance in each frequency band.

(Embodiment 25)
FIG. 29 is a plan view showing a configuration of an antenna device 2300 according to Embodiment 25 of the present invention. However, in this figure, portions common to FIG. 28 are denoted by the same reference numerals as in FIG. 28, and detailed description thereof will be omitted. FIG. 29 differs from FIG. 28 in that the switching element is changed to a resonance circuit.

The resonance circuits 2301-1 to 2301- (n-1) correspond to the first to n-th frequency bands, respectively. The resonance circuits 2301-1 to 2301- (n-1) have a very small impedance in the corresponding frequency band, and are close to a state in which the L-shaped antenna element 305 is short-circuited to the ground plane 301. . It has a certain impedance characteristic in a frequency band that does not correspond.

Here, the case where the antenna device 2300 corresponds to the first frequency band will be described. In this case, only the feeding point 2201-0 supplies power, and there is no resonance circuit corresponding to the first frequency band in the resonance circuits 2301-1 to 2301- (n-1). It has certain impedance characteristics. Therefore, the antenna device 2300 radiates radio waves in the first frequency band by operating as a transmission line antenna short-circuited at the closed end.

Next, when corresponding to the N-th frequency band (N: any one that satisfies N ≦ N ≦ n−1), only the corresponding feeding point 2202-N supplies power, and the impedance of the corresponding resonance circuit 2301-N becomes Very small. For this reason, the antenna device 2300 operates as a transmission line antenna that is fed at the feeding point 2202-N and short-circuited at the position of the resonance circuit 2301-N. As a result, the antenna device 2300 emits radio waves in the Nth frequency band.

The antenna device 2300 radiates both vertical and horizontal polarization components in each of the first to n-th frequency bands because the L-shaped antenna element 305 is formed in the length direction and the width direction of the ground plane.

As described above, according to the present embodiment, as described in the twenty-fourth embodiment, the antenna device does not require a switch for switching to a corresponding frequency band, and does not require switch switching control. It is possible to realize a multi-resonant antenna device with a simple configuration and an arbitrary impedance.

(Embodiment 26)
FIG. 30 is a plan view showing a configuration of an antenna device 2400 according to Embodiment 26 of the present invention. However, in this figure, portions common to FIG. 4 are denoted by the same reference numerals as in FIG. 4, and detailed description thereof will be omitted.

The substantially U-shaped slot 102 has a power supply point 2401-1 whose electrical length is equal to or longer than 波長 of the wavelength of the first frequency band and whose opening is connected to a wireless circuit corresponding to the first frequency band. Are provided, and the feeding point 2401-1 feeds the substantially U-shaped antenna element 104.

A feeding point 2401-2 connected to a wireless circuit corresponding to a second frequency band higher than the first frequency band is provided in the substantially U-shaped slot 102, and the feeding point 2401-2 is substantially U-shaped. To the antenna element 104. In addition, a switching element 2402 is provided at a position where the electrical length from the feeding point 2401-2 is equal to or longer than １ ／ wavelength of the second frequency band.

The switching element 2402 is “OFF” in the first frequency band, short-circuits the substantially U-shaped antenna element 104, and is “ON” in the second frequency band, and releases the short-circuit of the substantially U-shaped antenna element 104. Switching is performed.

When the switching element 2402 is “OFF”, only the feeding point 2401-1 supplies power to the substantially U-shaped antenna element 104, and the antenna device 2400 operates as a short-circuited transmission line antenna at the closed end, and Emit radio waves in one frequency band.

On the other hand, when the switching element is “ON”, the substantially U-shaped antenna element 104 is short-circuited at the position of the switching element 2402. Also, only the feeding point 2401-2 feeds the substantially U-shaped antenna element 104, and the antenna device 2400 radiates radio waves in the second frequency band by operating as a short-circuited transmission line antenna at the position of the switching element 2402. I do.

As described above, according to the present embodiment, by providing the feeding point corresponding to the first frequency band and the feeding point corresponding to the second frequency band, the case where there is a large difference between the first and second frequency bands However, a thin antenna device having two resonances can be easily realized with an arbitrary impedance in each frequency band.

(Embodiment 27)
FIG. 31 is a plan view showing a configuration of an antenna device 2500 according to Embodiment 27 of the present invention. However, in this figure, portions common to FIG. 30 are denoted by the same reference numerals as in FIG. 30, and detailed description thereof will be omitted. FIG. 31 differs from FIG. 30 in that the switching element 2402 is replaced with a resonance circuit 2501.

(4) In the first frequency band, the impedance of the resonance circuit 2501 is extremely large, and the substantially U-shaped antenna element 104 is close to a state where the antenna element 104 is opened from the base plate 101. Therefore, the resonance circuit 2501 can be regarded as an open state. Further, in the second frequency band, the impedance is extremely small, which is close to a state in which the substantially U-shaped antenna element 104 is short-circuited to the base plate 101, and thus can be regarded as a short-circuited state.

Here, the case where the antenna device 2500 corresponds to the first frequency band or the second frequency band will be described. First, when corresponding to the first frequency band, only the feeding point 2401-1 supplies power, and the impedance of the resonance circuit 2501 becomes very large. Therefore, the antenna device 2500 radiates radio waves in the first frequency band by operating as a transmission line antenna short-circuited at the closed end.

{Next, when corresponding to the second frequency band, only the feeding point 2401-2 supplies power, and the impedance of the resonance circuit 2501 becomes very small. Therefore, the antenna device 2500 emits radio waves in the second frequency band by operating as a short-circuited transmission line antenna at the position of the resonance circuit 2501.

As described above, according to the present embodiment, by providing the first feeding point corresponding to the first frequency band and the second feeding point corresponding to the second frequency band, the first and second frequency bands have a large size. Even if there is a difference, it is possible to easily realize a two-resonance thin antenna device with an arbitrary impedance in each frequency band.

(Embodiment 28)
FIG. 32 is a plan view showing a configuration of an antenna device 2600 according to Embodiment 28 of the present invention. However, in this figure, portions common to FIG. 30 are denoted by the same reference numerals as in FIG. 30, and detailed description thereof will be omitted. FIG. 32 differs from FIG. 30 in that n feeding points and n−1 switching elements are provided.

The feeding points 2601-0 to 2601- (n-1) are provided in the substantially U-shaped slot 102, and are connected to radio circuits corresponding to the first to n-th frequency bands, respectively. The feed point feeds the substantially U-shaped antenna element 104. Here, it is assumed that the frequency band increases from the first frequency band to the n-th frequency band.

{Circle around (2)} The switching elements 2602-1 to 2602- (n-1) are provided at positions from the feeding points 2601-1 to 2601- (n-1) that are at least 1/4 wavelength of the corresponding frequency band. Further, the switching elements 2602-1 to 2602- (n-1) perform switching to short-circuit the substantially U-shaped antenna element 104 when "ON" and to cancel short-circuiting the substantially U-shaped antenna element 104 when "OFF". Assumed to be performed.

When the switching elements 2602-1 to 2602- (n-1) are "OFF", only the feeding point 2601-0 supplies power, and the antenna device 2600 operates as a short-circuited transmission line antenna at the closed end. , And emits a radio wave of a first frequency band.

場合 When the switching element 2602-N (N: any one satisfying N ≦ N ≦ n−1) is “ON”, the substantially U-shaped antenna element 104 is short-circuited at the position of the switching element 2602-N. Further, since only the feeding point 2601-N supplies power, the antenna device 2600 radiates radio waves in the Nth frequency band by operating as a transmission line antenna with a short-circuited tip.

As described above, according to the present embodiment, by providing the feeding points corresponding to the first to n-th frequency bands, it is possible to realize a multi-resonant thin antenna device with an arbitrary impedance in each frequency band. .

(Embodiment 29)
FIG. 33 is a plan view showing the configuration of antenna device 2700 according to Embodiment 29 of the present invention. However, in this figure, portions common to FIG. 32 are denoted by the same reference numerals as in FIG. 32, and detailed description thereof will be omitted. FIG. 33 differs from FIG. 32 in that the switching element is changed to a resonance circuit.

The resonance circuits 2701-1 to 2701- (n-1) have a very short impedance in the corresponding frequency band, and are close to a state where the substantially U-shaped antenna element 104 is short-circuited to the ground plane 101. Can be considered. It has a certain impedance characteristic in a frequency band that does not correspond.

Here, a case where the antenna device 2700 corresponds to the first frequency band will be described. In this case, only the feeding point 2601-0 feeds the substantially U-shaped antenna element 104, and the resonance circuits 2701-1 to 2701- (n-1) include a resonance circuit that can be regarded as short-circuited in the first frequency band. Therefore, each resonance circuit has a certain impedance characteristic. Therefore, the antenna device 2700 operates as a transmission line antenna short-circuited at the closed end. As a result, the antenna device 2700 emits radio waves in the first frequency band.

Next, when corresponding to the N-th frequency band (N: any one that satisfies N ≦ N ≦ n−1), only the corresponding feeding point 2601-N supplies power, and the impedance of the corresponding resonance circuit 2701-N becomes Very small. For this reason, the antenna device 2700 operates as a transmission line antenna which is supplied with power at the feeding point 2601-N and is short-circuited at the position of the resonance circuit 2701-N. As a result, the antenna device 2700 emits radio waves in the Nth frequency band.

As described above, according to the present embodiment, as described in Embodiment 28, the antenna device does not require a switch for switching to a corresponding frequency band, and does not require switch switching control or the like. It is possible to realize a multi-resonant antenna device with a simple configuration and an arbitrary impedance.

(Embodiment 30)
FIG. 34 is a plan view showing a configuration of an antenna device 2800 according to Embodiment 30 of the present invention. In this figure, a ground plane 2801 is a conductive circuit board.

As for the antenna elements 2802-1 to 2802-3, a coil is connected between the respective elements, and the entire antenna element including the coil extends along the length direction and width direction of the ground plate within the thickness of the ground plate 2801. It is provided to be L-shaped.

The length of the antenna element 2802-2 is such that the electrical length is １ ／ wavelength or more of the second frequency band. Further, the antenna element 2802-2 has the same aspect ratio as the electrical length of the entire antenna element including the coil. However, it is assumed that the second frequency band is a frequency band higher than the first frequency band.

The coil 2803-1 is connected between the antenna element 2802-1 and the antenna element 2802-2, and the coil 2802-2 is connected between the antenna element 2802-2 and the antenna element 2802-3. Further, the coils 2803-1 and 2803-2 operate as reactance elements in the first frequency band. In the second frequency band, the impedance becomes extremely large, and it can be considered that only the antenna element 2802-2 is provided independently.

The feeding point 2804-1 is connected to the wireless circuit corresponding to the first frequency band, and feeds the antenna element 2802-1 from one end where the coil 2803-1 is not connected. The feeding point 2804-2 is connected to a wireless circuit corresponding to the second frequency band, and feeds the antenna element 2802-2 from one end to which the coil 2803-1 is connected.

The switching element 2805-1 is provided at one end of the antenna element 2802-3, and performs switching such that one end to which the coil 2803-2 is not connected is short-circuited to the base plate 2801 by "ON" and opened by "OFF". . Further, the switching element 2805-2 is provided at one end of the antenna element 2802-2, and is switched to short-circuit one end to which the coil 2803-2 is connected to the ground plate 2801 when "ON" and open it when "OFF". I do.

(4) When the antenna device 2800 corresponds to the first frequency band, power is supplied to the antenna element 2802-1 only from the feeding point 2804-1, and the entire antenna element including the coil operates. As a result, the antenna device 2800 emits radio waves in the first frequency band.

Here, when the switching element 2805-1 is turned “ON”, the entire antenna element including the coil operates as a transmission line antenna with a short-circuited tip. When the switching element 2805-1 is turned “OFF”, the entire antenna element including the coil is L-shaped inverted L-shaped. Act as an antenna. Thereby, the radiation pattern when radiating the radio wave of the first frequency band can be changed.

Next, when the antenna device 2800 corresponds to the second frequency band, power is supplied to the antenna element 2802-2 only from the feeding point 2804-2. Since the impedance of the coil 2803-1 and the coil 2803-2 is very large in the second frequency band, the state is opened between the antenna element 2802-2 and the antenna element 2802-1 and the antenna element 2802-3. Get closer. Therefore, only the antenna element 2802-2 operates. As a result, the antenna device 2800 emits radio waves in the second frequency band.

Here, when the switching element 2802-2 is turned “ON”, the antenna element 2802-2 operates as a transmission line antenna with a short-circuited tip, and when turned “OFF”, the antenna element 2802-2 becomes an L-shaped inverted L antenna. Operate. Thereby, the radiation pattern when radiating the radio wave of the second frequency band can be changed.

Note that the antenna device 2800 emits both vertically and horizontally polarized components because the operating antenna element is L-shaped.

As described above, according to the present embodiment, in addition to the effect of the twenty-second embodiment, by performing switching such that one end of the antenna element is short-circuited or opened to the ground plane, the transmission line antenna having the short-circuited tip and the L-shaped inverted L Since the antenna can be realized, a two-resonance thin antenna device that radiates in different radiation patterns can be realized.

(Embodiment 31)
FIG. 35 is a plan view showing a configuration of an antenna device 2900 according to Embodiment 31 of the present invention. In this figure, a ground plane 2901 is a conductive circuit board.

As for the antenna elements 2902-1 to 2902-3, a coil is connected between the respective elements, and the entire antenna element including the coil extends along the length direction and width direction of the ground plate within the thickness of the ground plate 2901. It is provided so as to be substantially U-shaped.

The total length of the antenna element including the coil has an electrical length of at least 1/4 wavelength of the first frequency band, and the length of the antenna element 2902-2 has an electrical length of at least 1/4 wavelength of the second frequency band. . The antenna element 2902-2 is substantially U-shaped. However, it is assumed that the second frequency band is a frequency band higher than the first frequency band.

Coil 2903-1 is connected between antenna element 2902-1 and antenna element 2902-2, and coil 2902-2 is connected between antenna element 2902-2 and antenna element 2902-2. Also, the coils 2903-1 and 2903-2 operate as reactance elements in the first frequency band. In the second frequency band, the impedance becomes very large.

The feeding point 2904-1 is connected to a wireless circuit corresponding to the first frequency band, and feeds the antenna element 2902-1 from one end where the coil 2903-1 is not connected. The feeding point 2904-2 is connected to a wireless circuit corresponding to the second frequency band, and feeds the antenna element 2902-2 from one end to which the coil 2903-1 is connected.

The switching element 2905-1 is provided at one end of the antenna element 2902-2, and performs switching such that one end to which the coil 2903-2 is connected is short-circuited to the base plate 2901 by "ON" and opened by "OFF". . Further, the switching element 2905-2 is provided at one end of the antenna element 2902-3, and short-circuits one end to which the coil 2903-2 is not connected to the base plate 2901 by “ON” and opens by “OFF”. I do.

(4) When the antenna device 2900 corresponds to the first frequency band, power is supplied to the antenna element 2902-1 only from the feeding point 2904-1, and the entire antenna element including the coil operates. As a result, the antenna device 2900 emits radio waves in the first frequency band.

Here, when the switching element 2905-2 is turned “ON”, the entire antenna element including the coil operates as a transmission line antenna with a short-circuited tip, and when turned “OFF”, the entire antenna element including the coil is substantially U-shaped inverted. Operate as L antenna. Thereby, the radiation pattern when radiating the radio wave of the first frequency band can be changed.

Next, when the antenna device 2900 corresponds to the second frequency band, power is supplied to the antenna element 2902-2 only from the feeding point 2904-2. Since the impedance of the coil 2903-1 and the coil 2903-2 becomes extremely large in the second frequency band, it can be considered that the antenna element 2902-2 is provided independently. Therefore, only the antenna element 2902-2 operates. As a result, the antenna device 2900 emits radio waves in the second frequency band.

Here, when the switching element 2902-2 is turned “ON”, the antenna element 2902-2 operates as a transmission line antenna having a short-circuited tip, and when the switching element 2902-2 is turned “OFF”, the antenna element 2902-2 becomes a substantially U-shaped inverted L antenna. Works as Thereby, the radiation pattern when radiating the radio wave of the second frequency band can be changed.

As described above, according to the present embodiment, in addition to the effect of the twenty-third embodiment, by performing switching such that one end of the antenna element is short-circuited or opened to the ground plane, the transmission line antenna with the short-circuited tip is substantially U-shaped inverted. Since an L antenna can be realized, a two-resonance thin antenna device that radiates in different radiation patterns can be realized.

(Embodiment 32)
FIG. 36 is a plan view showing the configuration of antenna device 3000 according to Embodiment 32 of the present invention. In this figure, a ground plane 3001 is a conductive circuit board.

The plurality of antenna elements are connected to each other through a coil between the elements, and the entire antenna element including the coil (hereinafter, referred to as “the coil element”) along the length direction and width direction of the ground plate within the thickness of the ground plate 3001. 1st antenna element unit) is provided in L-shape. The total length of the first antenna element unit has an electrical length of １ ／ wavelength or more of the first frequency band.

From antenna element 3002-2 to antenna element 3003-2 (hereinafter, referred to as “second antenna element unit”) in which a coil is connected between the elements, the aspect ratio is the same as that of the first antenna element unit. The electrical length of the two antenna element units is equal to or longer than １ ／ wavelength of the second frequency band. Note that the second frequency band is a frequency band higher than the first frequency band.

The antenna elements 3002-n (hereinafter, referred to as “n-th antenna element unit”, where n is an arbitrary positive number of n ≧ 3) have the same aspect ratio as the first antenna element unit, and have the n-th antenna element unit. The total length has an electrical length of １ ／ wavelength or more of the n-th frequency band. Note that the n-th frequency band is a frequency band higher than the (n-1) -th frequency band.

The feeding points 3004-1 to 3004-n are connected to radio circuits corresponding to the first to n-th frequency bands, respectively, and feed power from one end of each of the first to n-th antenna element units.

The coils 3005-1 to 3005- (n-1) and the coils 3006-1 to 3006- (n-1) have extremely large impedances in a predetermined frequency band, and the elements to which the coils are connected are independent. Can be regarded as being provided. Specifically, for example, when the antenna element 3002-n is fed from the feeding point 3004-n, the impedance of the coils 3005- (n-1) and 3006- (n-1) becomes very large, It can be considered that only the antenna element 3002-n is provided independently.

The switching elements 3007-1 to 3007-n are connected to one end of each antenna element unit to which power is not supplied, and are switched to short-circuit each antenna element unit to the ground plane 3001 when "ON" and open when each antenna element unit is "OFF".

When the antenna device 3000 corresponds to the first frequency band, only the feeding point 3006-1 supplies power to the first antenna element unit, and the first antenna element unit operates. As a result, the antenna device 3000 emits radio waves in the first frequency band.

Here, when the switching element 3007-1 is set to “ON”, the first antenna element unit operates as a transmission line antenna having a short-circuited tip, and when set to “OFF”, the first antenna element unit functions as an L-shaped inverted L antenna. Operate. Thereby, the radiation pattern when radiating the radio wave of the first frequency band can be changed.

Next, when corresponding to the N-th frequency band (N: any one that satisfies N ≦ N ≦ n−1), only the corresponding feeding point 3004-N feeds power to the N-th antenna element unit and the N-th antenna The element unit operates. As a result, the antenna device 3000 emits radio waves in the Nth frequency band.

Here, when the switching element 3007-N is turned “ON”, the N-th antenna element unit operates as a transmission line antenna with a short-circuited tip, and when turned “OFF”, the N-th antenna element unit becomes an L-shaped inverted L antenna. Operate. This makes it possible to change the radiation pattern when radiating radio waves in the Nth frequency band.

As described above, according to the present embodiment, while the thirtieth embodiment can realize an antenna device having two resonances, an antenna device having n resonances (n ≧ 3) can be realized.

(Embodiment 33)
FIG. 37 is a plan view showing a configuration of an antenna device 3100 according to Embodiment 33 of the present invention. In this figure, a ground plane 3101 is a conductive circuit board.

A coil is connected between each of the plurality of antenna elements, and the entire antenna element including the coil (hereinafter, referred to as “first element”) is provided along the length direction and width direction of the base plate within the thickness of the base plate 3101. Antenna unit) ”is provided to be substantially U-shaped. The total length of the first antenna element unit has an electrical length of １ ／ wavelength or more of the first frequency band.

The total length of the antenna element 3102-2 to the antenna element 3103-2 (hereinafter, referred to as a "second antenna element unit") in which a coil is connected between the elements has an electrical length equal to or more than １ ／ wavelength of the second frequency band It is. Note that the second frequency band is a frequency band higher than the first frequency band.

全長 The total length of the antenna element 3102-n (hereinafter, referred to as “n-th antenna element unit”) is an electrical length equal to or more than １ ／ wavelength of the n-th frequency band. Note that the n-th frequency band is a frequency band higher than the (n-1) -th frequency band.

The feeding points 3104-1 to 3104-n are connected to wireless circuits corresponding to the first to n-th frequency bands, respectively, and feed power from one end of each of the first to n-th antenna element units.

The impedance of the coils 3105-1 to 3105- (n-1) and the coils 3106-1 to 3106- (n-1) becomes extremely large in a predetermined frequency band, and the element to which the coil is connected is opened. It becomes close to the state where it came. Specifically, for example, when the antenna element 3102-n is fed from the feeding point 3104-n, the impedance of the coil 3105- (n-1) and the coil 3106- (n-1) becomes very large, It can be considered that only the antenna element 3102-n is provided independently.

The switching elements 3107-1 to 3107-n are connected to one end of each antenna element unit to which power is not supplied, and switch each antenna element unit to “ON” to short-circuit the ground plate 3101 and to “OFF” to open.

When the antenna device 3100 corresponds to the first frequency band, only the feeding point 3106-1 supplies power to the first antenna element unit, and the first antenna element unit operates. As a result, the antenna device 3100 emits radio waves in the first frequency band.

Here, when the switching element 3107-1 is turned “ON”, the first antenna element unit operates as a transmission line antenna having a short-circuited tip, and when the switching element 3107-1 is turned “OFF”, the first antenna element unit is a substantially U-shaped inverted L antenna. Works as Thereby, the radiation pattern when radiating the radio wave of the first frequency band can be changed.

Next, when corresponding to the N-th frequency band (N: any one that satisfies N: 1 ≦ N ≦ n−1), only the corresponding feeding point 3104-N feeds power to the N-th antenna element unit, and the N-th antenna The element unit operates. As a result, the antenna device 3100 emits radio waves in the Nth frequency band.

Here, when the switching element 3107-N is turned “ON”, the Nth antenna element unit operates as a transmission line antenna with a short-circuited tip, and when turned “OFF”, the Nth antenna element unit is a substantially U-shaped inverted L antenna. Works as This makes it possible to change the radiation pattern when radiating radio waves in the Nth frequency band.

As described above, according to the present embodiment, while the thirty-first embodiment can realize an antenna device having two resonances, an antenna device having n resonances (n ≧ 3) can be realized.

(Embodiment 34)
FIG. 38 is a plan view showing a configuration of an antenna device 3200 according to Embodiment 34 of the present invention. However, in this figure, parts common to FIG. 4 are denoted by the same reference numerals as in FIG. 4, and detailed description thereof will be omitted. 38 differs from FIG. 4 in that the substantially U-shaped slot 102 is changed to a substantially U-shaped slot 3201 having a different slot length, and that radiation pattern changeover switches 3202a and 3202b are provided.

The slot 3201 is formed by penetrating the ground plane 101, which is a conductive circuit board, in the thickness direction. At one end of the slot 3201, an opening is formed in a part of the side surface of the base plate 101, and a feed point 103 for feeding power to the substantially U-shaped antenna element 104 is provided near the opening. The entire length of the slot 3201 from the opening is an electrical length, which is about 0.75 wavelength of the used frequency band. Note that the other end of the slot 3201 is closed. Further, a radiation pattern changeover switch 3202a is provided at a position of 0.5 wavelength from the opening, and a radiation pattern changeover switch 3202b is provided at a position of 0.22 wavelength from the opening.

The radiation pattern changeover switches 3202a and 3202b short-circuit or open the substantially U-shaped antenna element 104 to the ground plane 101 by switching between “ON” and “OFF”. For example, the substantially U-shaped antenna element 104 is short-circuited at the position of the switch turned “ON”, and the short-circuit of the substantially U-shaped antenna element 104 is released at “OFF”.

Next, the radiation characteristics of the antenna device 3200 when the radiation pattern changeover switches 3202a and 3202b are switched will be described with reference to FIG. Note that the frequency used here is 1900 MHz, X in FIG. 39 indicates the direction in front of the paper of FIG. 38, and Y and Z indicate the directions of the coordinate axes described in FIG. In FIG. 39, the radiation characteristics on the XY plane, the YZ plane, and the XZ plane are shown from the left, and the thick line indicates vertical polarization and the thin line indicates horizontal polarization.

FIG. 39A shows the radiation characteristics of the antenna device 3200 when both the radiation pattern changeover switches 3202a and 3202b are turned “OFF”. FIG. 39B shows the radiation characteristics of the antenna device 3200 when the radiation pattern changeover switch a is turned “ON”. FIG. 39C shows the radiation characteristics of the antenna device 3200 when the radiation pattern changeover switch 3200b is turned “ON”.

As described above, by controlling the radiation pattern changeover switches 3202a and 3202b to “ON” and “OFF”, radiation characteristics of different polarizations can be obtained as shown in FIG. 39. Different radiation characteristics can also be obtained for the polarization plane of the main polarization. This is because when the radiation pattern changeover switch is turned “ON”, the substantially U-shaped antenna element 104 is short-circuited to the base plate 101 at the position of the switch, and by controlling “ON” and “OFF” of the switch, This is because the length from the portion to the short-circuited position, that is, the slot length is made variable.

As described above, according to the present embodiment, a radiation pattern changeover switch is provided in a substantially U-shaped slot, and this switch is switched between “ON” and “OFF”, so that a desired radiation characteristic can be obtained with a simple configuration. Can be realized.

In the present embodiment, the position where the radiation pattern changeover switch is provided is described as 0.5 wavelength and 0.22 wavelength from the opening, but the present invention is not limited to this and may be provided at any position.

Also, in the present embodiment, the case where two radiation pattern changeover switches are provided has been described, but the present invention is not limited to this, and any number may be provided.

Also, in the present embodiment, the shape of the slot has been described as being substantially U-shaped, but the present invention is not limited to this, and the present invention can be similarly applied to L-shaped and C-shaped slots.

Further, in the present embodiment, the slot has an electrical length from the opening of about 0.75 wavelength of the operating frequency band, but the total length of the slot is any value as long as it is 1/4 wavelength or more of the operating frequency band. You may take it.

(Embodiment 35)
In recent years, mobile phones have become increasingly multifunctional, and are provided with functions such as videophone and information browsing, as well as calls and standbys. When using each function, the user adapts the mobile phone to the function. In the present embodiment, a case where the radiation pattern is switched in accordance with the usage mode will be described in view of the usage (form).

FIG. 40 is a block diagram showing a configuration of an antenna device 3300 according to Embodiment 35 of the present invention. However, in this figure, portions common to FIG. 38 are denoted by the same reference numerals as in FIG. 38, and detailed description thereof will be omitted.

(4) The reception level measurement unit 3301 acquires the radio wave received by the substantially U-shaped antenna element 104 via any of the matching circuits 3305a to 3305c, and measures the reception level of the acquired signal. The measured reception level is notified to determination section 3302.

The determination unit 3302 determines which radiation pattern is suitable for the current usage pattern based on the reception level notified from the reception level measurement unit 3301, and notifies the control unit 3303 of the determination result.

The control unit 3303 controls the radiation pattern changeover switches 3202a and 3202b and the matching circuit changeover switches 3304a and 3304b according to the judgment result notified from the judgment unit 3302.

The matching circuit changeover switches 3304a and 3304b switch the connection with the matching circuits 3305a to 3305c under the control of the control unit 3303 so as to be in a matching state.

The matching circuits 3305a to 3305c are provided so as to be in a matching state when the radiation pattern changeover switches 3202a and 3202b are switched. For example, when the radiation pattern changeover switches 3202a and 3202b are both "OFF", the matching circuit 3305a is connected, and a matching state is established. When the radiation pattern changeover switch 3202a is "ON", the matching circuit 3305b is connected. As a result, a matching state is obtained. Furthermore, when the radiation pattern changeover switch 3202b is “ON”, the matching circuit 3305c is connected, and a matching state is established.

Next, the operation of the antenna device 3300 having the above configuration will be described. When the antenna device 3300 receives a radio wave, the control unit 3303 controls the radiation pattern changeover switches 3202a and 3202b, and sequentially forms all the radiation patterns that can be realized by the antenna device 3300.

The reception level measurement unit 3301 measures the reception level of the radio wave received in each of the formed radiation patterns, and the determination unit 3302 determines the radiation pattern with the maximum reception level measured by the reception level measurement unit 3301. I do. The control unit 3303 controls the radiation pattern changeover switches 3202a and 3202b in the determination unit 3302 so that the radiation pattern has the maximum reception level, and matches the circuit in the matching state at that time. Control.

This makes it possible to form a radiation pattern that allows the maximum reception level to be obtained, regardless of how the user uses the mobile phone.

As described above, according to the present embodiment, by controlling the radiation pattern changeover switch, all the radiation patterns that can be realized by the antenna device are sequentially formed, and the reception level of the signal received in each radiation pattern is maximized. By controlling the radiation pattern changeover switch so as to obtain a radiation pattern, it is possible to form a radiation pattern according to a usage pattern.

In the present embodiment, the switching of the radiation pattern is controlled based on the reception level. However, the present invention is not limited to this, and may be performed based on the reception electric field strength.

(Embodiment 36)
FIG. 41 is a plan view showing a configuration of an antenna device 3400 according to Embodiment 36 of the present invention. However, in this figure, parts common to FIG. 4 are denoted by the same reference numerals as in FIG. 4, and detailed description thereof will be omitted.

The circuit board 3401 (the white portion (the slot 102 and the like)) is an insulating material that does not easily conduct electricity. In the conductive layer 3402 (shaded portion), the slot 102 and the substantially U-shaped antenna element 104 are formed of a layered conductor on the circuit board 3401, similarly to the antenna device 100 shown in FIG. ing. A power supply point 103 is provided in the opening of the slot 102.

Thus, the slot 102 can be formed more easily than in the case where the substantially U-shaped slot 102 is provided on the conductive circuit board, and the antenna device can be manufactured more easily.

According to this embodiment, an antenna device can be provided more simply by forming a substantially U-shaped slot in a conductive layer on an insulating circuit board.

As shown in FIG. 42, a dielectric film 3502 in which the above-described conductive layer is formed of a film-shaped dielectric may be attached to the inner surface of a housing 3501 such as a mobile phone to constitute the antenna device 3500. .

(Embodiment 37)
FIG. 43 is a plan view showing a configuration of an antenna device 3600 according to Embodiment 37 of the present invention. However, in this figure, portions common to FIG. 41 are denoted by the same reference numerals as in FIG. 41, and detailed description thereof will be omitted.

The radiation pattern changeover switches 3202a and 3202b short-circuit or open the substantially U-shaped antenna element 104 to the ground plane 101 by switching between “ON” and “OFF”. For example, the substantially U-shaped antenna element 104 is short-circuited at the position of the switch turned “ON”, and the short-circuit of the substantially U-shaped antenna element 104 is released at “OFF”.

Thus, the slot 102 can be formed more easily than the case where the substantially U-shaped slot 102 is provided in the conductive circuit board, and the antenna device that forms a different radiation pattern can be manufactured more easily. .

According to this embodiment, an antenna device can be provided more simply by forming a substantially U-shaped slot in a conductive layer on an insulating circuit board.

As shown in FIG. 44, a dielectric film 3502 in which the above-described conductive layer is formed of a film-shaped dielectric may be attached to the inner surface of a housing 3501 of a mobile phone or the like to form the antenna device 3700. .

An antenna device according to the present invention includes an antenna element having an electrical length equal to or longer than １ ／ wavelength of a used frequency band within a range of a thickness of a substrate serving as a ground plane, disposing the antenna element along the substrate, By feeding power from one end and short-circuiting the other end, the antenna device is realized within the range of the thickness of the substrate serving as the ground plane, and has the effect of reducing the size and thickness of the antenna device. Suitable for use in wireless devices and the like.

FIG. 2 is a plan view showing the configuration of the antenna device according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing the configuration of the antenna device according to Embodiment 1 of the present invention. FIG. 4 is a perspective view showing a configuration of an antenna device according to Embodiment 2 of the present invention. FIG. 7 is a plan view showing the configuration of the antenna device according to Embodiment 3 of the present invention. FIG. 9 is a perspective view showing a configuration of an antenna device according to Embodiment 3 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 4 of the present invention. 4 is a perspective view showing a configuration of an antenna device according to Embodiment 4 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 5 of the present invention. Perspective view showing the configuration of the antenna device according to Embodiment 5 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 6 of the present invention. FIG. 17 is a plan view showing the configuration of the antenna device according to Embodiment 7 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 8 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 9 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 10 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 11 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 12 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 13 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 14 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 15 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 16 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 17 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 18 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 19 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 20 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 21 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 22 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 23 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 24 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 25 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 26 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 27 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 28 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 29 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 30 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 31 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 32 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 33 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 34 of the present invention. A diagram showing a radiation characteristic of the antenna device according to Embodiment 34 of the present invention. A diagram showing a radiation characteristic of the antenna device according to Embodiment 34 of the present invention. A diagram showing a radiation characteristic of the antenna device according to Embodiment 34 of the present invention. 35 is a block diagram showing a configuration of an antenna device according to Embodiment 35 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 36 of the present invention. Perspective view showing a structure of an antenna device according to Embodiment 36 of the present invention. Plan view showing the configuration of the antenna device according to Embodiment 37 of the present invention. 37 is a perspective view showing the configuration of the antenna device according to Embodiment 37 of the present invention. Perspective view showing the configuration of a conventional antenna device

Explanation of reference numerals

21, 101, 201, 301, 1101, 1201, 1301 Ground plate 102, 3201 U-shaped slot 22, 103, 203, 303, 1103, 1203, 1303 Feeding point 202 Linear slot 204, 304, 401, 801-1 801- (n-1), 901-1 to 901- (n-1), 1001-1 to 1001- (n-1), 1104, 1204, 1304, 1404, 1504, 1604, 1702-1 to 1702 -N, 1802-1 to 1802-n, 1902-1 to 1902-n Switching element 302 L-shaped slot 501, 601, 701 Series resonant circuit 205, 1102 Linear antenna element 305, 1202 L-shaped antenna element 23, 51, 104, 1302 Substantially U-shaped antenna elements 1401, 1402, 1 01, 1502, 1601, 1602, 1701-1 to 1701-n, 1801-1 to 1801-n, 1901-1 to 1901-n Antenna elements 1403, 1503, 1603, 1703-1 to 1703- (n-1) , 1803-1 to 1803- (n-1), 1903-1 to 1903- (n-1) Coil 3202a, 3202b Radiation pattern changeover switch 3301 Received level measurement unit 3302 Judgment unit 3303 Control unit 3304a, 3304b Matching circuit changeover switch 3305a to 3305c Matching circuit 3401 Circuit board 3402 Conductive layer 3501 Housing 3502 Dielectric film

Claims (18)

A dielectric substrate, a feeding point provided on one side edge of the dielectric substrate, one end is connected to the feeding point, and the other end is short-circuited to the other side edge of the dielectric substrate. And an approximately U-shaped antenna element having two parallel sides and having an electrical length equal to or longer than ４ wavelength of the operating frequency band. 2. The antenna device according to claim 1, wherein the antenna element is accommodated within a thickness range of the dielectric substrate and provided along an outer edge of the dielectric substrate. 3. 2. The antenna device according to claim 1, wherein the antenna element is provided at a position where two parallel sides are separated from the dielectric substrate by a predetermined distance and is parallel to the dielectric substrate. A dielectric substrate, which is bored so as to penetrate the dielectric substrate in a thickness direction, and has only one end of both ends opened so as to communicate with a side edge of the dielectric substrate, and A substantially U-shaped slot whose length is equal to or more than 波長 wavelength of the operating frequency band, and a substantially U-shaped antenna element formed on the dielectric substrate by piercing the substantially U-shaped slot. And a feed point provided in the vicinity of the opening. Dielectric substrate, and is pierced so as to penetrate the dielectric substrate in the thickness direction, and only one end of both ends is opened to communicate with a side edge or end of the dielectric substrate, A slot having an electrical length equal to or longer than 1/4 wavelength of the second frequency band; an antenna element formed on the dielectric substrate by piercing the slot; and a feeding point provided near the opening. And a switching element provided in the slot at a position where the electrical length is equal to or longer than 以上 wavelength of the first frequency band from the opening, and short-circuits or opens the antenna element. Antenna device. Dielectric substrate, and is pierced so as to penetrate the dielectric substrate in the thickness direction, and only one end of both ends is opened to communicate with a side edge or end of the dielectric substrate, A slot having an electrical length equal to or longer than 1/4 wavelength of the second frequency band; an antenna element formed on the dielectric substrate by piercing the slot; and a feeding point provided near the opening. And a series resonance provided in the slot at a position where the electrical length from the opening is equal to or more than ４ wavelength of the first frequency band, and has an impedance sufficiently larger in the second frequency band than in the first frequency band. And a circuit. Dielectric substrate, and is pierced so as to penetrate the dielectric substrate in the thickness direction, and only one end of both ends is opened to communicate with a side edge or end of the dielectric substrate, A slot having an electrical length equal to or longer than １ ／ wavelength of a lowest frequency band among a plurality of frequency bands used; an antenna element formed on the dielectric substrate by piercing the slot; A power supply point provided in the vicinity of the portion, a switching element that is provided at a position where the electrical length from the opening in the slot becomes １ ／ wavelength or more for each used frequency band, and short-circuits or opens the antenna element; An antenna device comprising: A dielectric substrate, an antenna element housed within the thickness range of the dielectric substrate, arranged along the dielectric substrate, and having an electrical length equal to or longer than １ ／ wavelength of a used frequency band; and And a switching element provided at the other end of the antenna element for short-circuiting or opening the antenna element to the dielectric substrate. A dielectric substrate, which is bored so as to penetrate the dielectric substrate in a thickness direction, and has only one end of both ends opened so as to communicate with a side edge of the dielectric substrate, and A slot having a length equal to or longer than a quarter wavelength of the first frequency band, an antenna element formed on the dielectric substrate by drilling the slot, and a radio circuit corresponding to a plurality of frequency bands. A plurality of feed points for feeding the antenna element, and a switching unit which is provided in the slot at a position which is １ ／ wavelength or more of a corresponding frequency band from the plurality of feed points and short-circuits or opens the antenna element. And an element. A dielectric substrate, which is bored so as to penetrate the dielectric substrate in a thickness direction, and has only one end of both ends opened so as to communicate with a side edge of the dielectric substrate, and A slot having a length equal to or longer than a quarter wavelength of the first frequency band, an antenna element formed on the dielectric substrate by drilling the slot, and a radio circuit corresponding to a plurality of frequency bands. A plurality of feed points for feeding the antenna element, and a plurality of feed points provided in the slot at positions that are at least 1/4 wavelength of a corresponding frequency band from the plurality of feed points, and have a sufficiently small impedance in a predetermined frequency band. And a resonance circuit. The antenna device according to any one of claims 5 to 10, wherein the antenna element is one of a linear antenna element, an L-shaped antenna element, and a substantially U-shaped antenna element. A dielectric substrate, a plurality of antenna elements housed within the thickness range of the dielectric substrate, and arranged along the dielectric substrate, a coil connected between each antenna element, and the coil A feed point provided at one end of the unconnected antenna element, and a switching element provided at one end of each antenna element remote from the feed point, wherein the coil has a frequency band to be used. Each antenna element is set to have a sufficiently large impedance in a predetermined frequency band as compared with the other frequency bands, and each antenna element has an electric length from the feeding point, including the coil, of 1/4 of the used frequency band. An antenna device, each having a length equal to or longer than a wavelength, wherein the switching element short-circuits or opens the antenna element to the dielectric substrate. Dielectric substrate, a plurality of antenna elements housed within the thickness range of the dielectric substrate, arranged along the dielectric substrate, connected between each antenna element, each in a predetermined frequency band A coil set to have a sufficiently large impedance compared to other frequency bands, a plurality of feeding points connected to radio circuits corresponding to the respective frequency bands, and provided at one end of the antenna element; and A switching element that is provided at one end of each of the antenna elements whose total length including the element and the coil is at least １ ／ wavelength of the corresponding frequency band from the position of the feeding point, and that short-circuits or opens the antenna element. An antenna device, comprising: 14. The antenna device according to claim 12, wherein an entire shape of the plurality of antenna elements and the coil connected thereto is one of a linear shape, an L shape, and a substantially U shape. . A dielectric substrate, which is bored so as to penetrate the dielectric substrate in a thickness direction, and has only one end of both ends opened so as to communicate with a side edge of the dielectric substrate, and An L-shaped, C-shaped, or U-shaped slot having a length equal to or longer than １ ／ wavelength of the used frequency band, and a slot formed in the dielectric substrate by piercing the slot. An antenna device comprising: an antenna element; a feed point provided in the vicinity of the opening; and a changeover switch provided at an arbitrary position in the slot and short-circuiting or opening the antenna element. The apparatus according to claim 15, further comprising: a determination unit configured to determine a state of a radio wave received by the antenna element; and a control unit configured to control the changeover switch based on a determination result of the determination unit. Antenna device. A dielectric film, which is a film-shaped dielectric, is provided so as to penetrate the dielectric film in the thickness direction, and only one end of both ends is communicated with a side edge of the dielectric film. A substantially U-shaped slot which is opened and whose electric length is equal to or longer than １ ／ wavelength of the operating frequency band; and a substantially U-shaped slot formed in the dielectric film by providing the substantially U-shaped slot. An antenna device comprising: a U-shaped antenna element; and a feed point provided in the vicinity of the opening. A dielectric film, which is a film-shaped dielectric, is provided so as to penetrate the dielectric film in the thickness direction, and only one end of both ends is communicated with a side edge of the dielectric film. A slot having an L-shape, a C-shape, or a U-shape which is opened and whose electric length is equal to or more than ４ wavelength of the operating frequency band; An antenna element formed on the body film, a feeding point provided in the vicinity of the opening, and a changeover switch provided at an arbitrary position in the slot and short-circuiting or opening the antenna element. Characteristic antenna device.

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