JP2006340202A - ANTENNA DEVICE AND RADIO COMMUNICATION DEVICE HAVING THE SAME - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wide band antenna for reducing interference with a heterogeneous wireless communication system sharing a frequency band.
An antenna 200 is constituted by an antenna electrode 201, a resonance suppression element 202 constituted by a resonator electrode 203 and a dielectric substrate 204, so that the resonator electrode 203 can be used for frequency components in a shared band. By resonating, signal energy is absorbed by dielectric loss of the dielectric substrate 204, transmission / reception of frequency components within the shared frequency band can be suppressed, and interference / interference with heterogeneous wireless communication systems can be reduced. .
[Selection] Figure 1

Description

  The present invention relates to an antenna device and a wireless communication device including the antenna device, and more particularly to an antenna used mainly in a broadband wireless communication device using a microwave band and a millimeter wave band.

  As an antenna for a conventional broadband wireless communication apparatus, there is an antenna using a circular antenna electrode (see, for example, Patent Document 1). FIG. 14 shows a conventional broadband antenna described in Patent Document 1. In FIG.

  In FIG. 14, when the lower end of the disk-shaped conductive radiating element (antenna electrode) 1 is disposed close to the ground (ground) 2, the top portion is positioned at the height of the diameter, respectively. Set to. A high frequency power supply 4 is connected to the base end of the power supply line 3. Thereby, an extremely flat antenna characteristic is realized over a wide frequency band.

JP 57-14003 A

  However, in the conventional configuration, when a part of the frequency band of the broadband wireless communication apparatus is shared with a heterogeneous radio communication system, in order to suppress interference with the heterogeneous radio communication system, There is a need for a band rejection filter that reduces the noise power level raised at the output of the transmit power amplifier. When such a band rejection filter is used, there is a problem in that the transmission loss of the wireless communication device and the reception sensitivity are degraded due to the passage loss of the band rejection filter.

  The present invention solves the above-described conventional problems, and suppresses antenna operation in a frequency band shared with a heterogeneous wireless communication system without reducing transmission power efficiency and reception sensitivity, and improves given / interfered characteristics. Accordingly, an object of the present invention is to provide a wideband antenna that can realize a wireless communication device with improved transmission power efficiency and reception sensitivity.

  In order to solve the above problems, the antenna device of the present invention includes a resonance suppression element including a resonator having a resonance frequency band within the frequency band of the antenna, and suppresses the resonance operation of the antenna in a predetermined frequency band. Thus, transmission / reception of high-frequency signal components in the interference frequency band is suppressed. That is, the antenna device includes an antenna electrode and a resonator having a resonance frequency within a frequency band of the antenna electrode, and having a narrower frequency bandwidth than the antenna electrode, and is connected to the antenna electrode. And a resonance suppression element that suppresses a resonance operation of the antenna electrode within a resonance band.

  This configuration suppresses the resonance itself of the resonator in the frequency band, so that a fundamental solution is achieved compared to the case where a filter is provided. Therefore, it is possible to provide an antenna that can reduce the interference / interference with different types of wireless communication systems that share a part of the frequency band, and that can realize a wireless communication device with improved transmission power efficiency and reception sensitivity. It becomes.

Further, the antenna device of the present invention includes the resonance suppression element that is current-coupled to the antenna electrode.
With this configuration, it is possible to reliably suppress resonance.

Further, the antenna device of the present invention includes an antenna device in which the resonance suppression element is electric field coupled to the antenna electrode.
With this configuration, resonance suppression can be performed without electrical connection with the antenna electrode. Therefore, when forming on the back surface of the substrate, it is not necessary to form a through hole, and the layout can be given flexibility. .

In the antenna device of the present invention, the resonance suppression element is a resonator electrode electrically connected to the antenna electrode, and a dielectric substrate having a dielectric loss interposed between the resonator electrode and the antenna electrode. And those with.
With this configuration, the dielectric loss can be easily controlled by selecting the material or shape of the dielectric substrate. The dielectric loss absorbs the high frequency signal component within the band of the resonance suppression element, and the high frequency within the band of the resonance suppression element. Transmission and reception of signal components can be suppressed.

In the antenna device of the present invention, the resonance suppression element includes a resonator electrode magnetically connected to the antenna electrode, and a dielectric substrate having a dielectric loss interposed between the resonator electrode and the antenna electrode. And those with.
With this configuration, the dielectric loss can be easily controlled by selecting the material or shape of the dielectric substrate, the high frequency signal component in the band of the resonance suppression element is absorbed by the dielectric loss, and the band in the resonance suppression element is within the band. Transmission and reception of high-frequency signal components can be suppressed.

In the antenna device of the present invention, the resonator electrode includes an isolated pattern.
With this configuration, formation is easy and layout is free.

The antenna device of the present invention includes an antenna device including a resonance suppression operation control unit that switches a resonance suppression operation of the resonance suppression element by controlling a resonance operation of the resonator.
With this configuration, a broadband having resonance suppression operation control means for switching the resonance suppression operation of the resonance suppression element by switching the resonance frequency and controlling the resonance operation of the resonator so as to suppress the resonance with respect to the frequency as required. It is possible to switch the operation of suppressing transmission / reception of a high-frequency signal component within the band of the resonance suppression element as an antenna.

In the antenna device of the present invention, the resonance suppression operation control means includes one connected between the resonator electrode and the antenna electrode.
With this configuration, the resonance operation of the resonator can be switched by changing the high-frequency coupling state of the resonator electrode with respect to the antenna electrode by the resonance suppression operation control means.

In the antenna device of the present invention, the resonance suppression element includes a resistance load that reduces a resonance Q of the resonator.
With this configuration, the high frequency signal component within the band of the resonance suppression element can be absorbed by the resistance load, and transmission / reception of the high frequency signal component within the band of the resonance suppression element can be suppressed.

The antenna device according to the present invention includes an antenna electrode that is a monopole antenna, a dielectric substrate shared with a radio unit connected to the antenna device, and input / output of a high-frequency signal between the antenna electrode and the radio unit. Including a power supply line that performs the operation of the antenna electrode and the ground of the antenna electrode.
With this configuration, transmission and reception of high-frequency signal components within the band of the resonance suppression element can be suppressed, and an antenna suitable for connection with an unbalanced feed line with the radio unit configured on the dielectric substrate can be realized.

The antenna device according to the present invention includes an antenna device having a shape similar to that of an antenna electrode, and a second antenna electrode that also serves as a ground electrode that forms a dipole antenna together with the antenna electrode.
This configuration suppresses transmission and reception of high-frequency signal components within the band of the resonance suppression element, and realizes an antenna suitable for connection with an unbalanced feed line with a radio unit configured on a dielectric substrate. The degree of influence on the antenna characteristics can be suppressed.

The antenna device of the present invention includes one in which the antenna electrode is a monopole antenna.
With this configuration, by using an antenna electrode that is a monopole antenna, it is possible to realize an antenna suitable for unbalanced power supply that suppresses transmission and reception of high-frequency signals within the band of the resonance suppression element.

The antenna device of the present invention includes one in which the antenna electrode is a dipole antenna.
With this configuration, the antenna electrode that is a dipole antenna is provided, so that an antenna suitable for balanced feeding that suppresses transmission and reception of high-frequency signals within the band of the resonance suppression element can be realized.

Further, the antenna device of the present invention includes a device provided with a circular antenna electrode having a broadband characteristic.
With this configuration, an antenna suitable for unbalanced feeding that suppresses transmission and reception of high-frequency signals within the band of the resonance suppression element can be realized by using a wideband antenna including a circular antenna electrode.

  The antenna device of the present invention includes one in which the resonator electrode is circular.

  Moreover, the antenna device of the present invention includes one in which the resonator electrode is a triangle.

  In the antenna device of the present invention, the resonator electrode has a sector shape.

In addition, the antenna device of the present invention includes a wireless unit that wirelessly communicates using a high-frequency signal within the band of the antenna device, and includes a device that suppresses the antenna gain within the frequency band of the resonance suppression element.
With this configuration, it is possible to configure a wireless communication system in which the degree of interference with different types of wireless communication systems sharing a part of the frequency band is suppressed.

The wireless communication device of the present invention generates a signal for controlling the antenna device, a wireless unit that performs wireless communication using a high-frequency signal in a band of the antenna device, and a resonance suppression operation control unit of the antenna device. This includes an interference level change signal generating means for controlling the degree of interference applied to different types of wireless communication systems.
With this configuration, it is possible to configure a radio communication system capable of switching the degree of interference with different types of radio communication systems sharing a part of the frequency band.

Further, the wireless communication apparatus of the present invention detects the presence / absence of a heterogeneous wireless communication system that may cause interference from the received signal and outputs an interference device determination signal to the interference level change signal generation unit Including those with
With this configuration, it is possible to configure a radio communication system that can efficiently switch the degree of interference in accordance with the presence or absence of different types of radio communication systems that share a part of the frequency band.

  According to the present invention, an antenna electrode and a resonator having a resonance frequency within the frequency band of the antenna electrode and having a frequency bandwidth narrower than that of the antenna electrode are connected to the antenna electrode and within the resonance band of the resonator. By including the resonance suppression element that suppresses the resonance operation of the antenna electrode, transmission / reception of a high-frequency signal within the band of the resonance suppression element can be suppressed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
1A and 1B are diagrams showing a wideband antenna according to Embodiment 1 of the present invention. FIG. 1A is a front view (partial cross-sectional view), FIG. 1B is a cross-sectional view from the side, and FIG. It is operation | movement explanatory drawing of c) and FIG.1 (d).

  In FIG. 1, reference numeral 100 denotes a broadband antenna of the present embodiment. The broadband antenna 100 includes an antenna electrode 101 made of a circular conductive material, and a resonator having a resonance frequency within the frequency band of the antenna electrode and having a narrower frequency bandwidth than the antenna electrode. A resonance suppression element that is connected to the antenna electrode and suppresses the resonance operation of the antenna electrode within the resonance band of the resonator is configured to suppress resonance in a desired frequency band. Is.

  That is, the resonance suppression element 102 includes a resonator electrode 103 electrically connected to the antenna electrode 101 through the through hole H, and a dielectric substrate 104 made of a dielectric material on a flat plate having dielectric loss. The The antenna electrode 101 operates as a monopole antenna with respect to the ground 105, is connected to a port 107 by a feed line 106 made of a coaxial line, and is connected to an external device such as a radio unit.

  FIG. 2 shows an antenna electrode radius of 6.8 mm, a resonator electrode radius of 2.9 mm, a dielectric substrate thickness of 0.8 mm, a relative dielectric constant of 4, and a dielectric loss of tan δ = 0. It is an example of the analysis result of the frequency characteristic of the antenna gain calculated | required by simulation on the conditions of 02. FIG.

  Here, the antenna electrode 101 exhibits a wide frequency characteristic of the frequency band f1 shown as an example in FIG. 2 by performing an antenna operation having a main electric field direction in the direction a in FIG. In FIG. 2, the vertical axis represents gain and the horizontal axis represents frequency. For the frequency component in the frequency band f2 of FIG. 2, the resonator electrode 103 constituting the resonance suppression element 102 resonates in the electric field direction of FIG. By absorbing a part of the energy, the efficiency of the wideband antenna 100 is lowered, the antenna gain is lowered, and the frequency characteristic of FIG. 2 is obtained. By reducing the antenna gain, it is possible to suppress emission of unnecessary noise power components in the case of transmission operation. In the case of a reception operation, reception of unnecessary noise components can be suppressed.

  FIGS. 1C and 1D are explanatory diagrams of operation. An arrow A1 in FIG. 1C is an example of a typical direction of the surface current of the antenna electrode 101 during antenna operation. An arrow A2 in FIG. 1D is an example of a typical direction of the surface current flowing on the surface on the antenna electrode 101 side of the resonator electrode 103 at the same timing as in FIG.

  According to such a configuration, the antenna electrode 101 exhibits a wide frequency characteristic of the frequency band f1 shown as an example in FIG. The frequency components in the frequency band f2 in FIG. 2 are indicated by arrows in FIGS. 1C and 1D due to the high-frequency current flowing from the connecting portion between the resonator electrode 103 and the antenna electrode 101 to the resonator electrode 103. The resonance electrode 103 constituting the resonance suppression element 102 is coupled to the antenna operation of the antenna electrode and resonates, and a part of the signal energy of the frequency component is absorbed by the dielectric loss of the dielectric substrate 104. As a result, the efficiency of the wideband antenna 100 is lowered, the antenna gain is lowered, and the frequency characteristic in the frequency band f2 has a valley shape as shown in FIG. By reducing the antenna gain, emission of unnecessary noise power components is suppressed in the case of transmission operation, and reception of unnecessary noise components is suppressed in the case of reception operation.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. FIG. 3A is a front view showing an antenna apparatus according to Embodiment 2 of the present invention, and FIG. 3B is a cross-sectional view of FIG. In FIG. 3, the same components as those in FIG. Two antenna electrodes 101 and a resonance suppression element 102 are configured in a dipole antenna shape, and one antenna electrode 101 is connected to a feed line 110 formed of a balanced line, and the other antenna electrode 101 is connected to a port 111. .

  With this configuration, it is possible to configure a broadband antenna that can be easily connected to a balanced power supply external circuit, and to perform antenna operation without a ground. The resonance suppression element is formed on the same surface as shown in FIG.

  As a modification of the present embodiment, it may be formed on different surfaces as shown in the cross-sectional view of FIG. The front view is the same as that shown in FIG. Furthermore, as shown in FIG. 4B, by forming a dielectric substrate as a resonance suppression element on both sides, it is possible to suppress the resonance operation more strongly by increasing the amount of energy absorbed by the resonance suppression element. It becomes.

  In this embodiment, an example in which a circular resonator electrode is used as the resonance suppression element is shown. However, the present invention is not limited to a circular shape, and a triangular or fan-shaped resonance suppression element may be used. Further, as a small resonator, one end of the resonator electrode is directly connected to the antenna electrode, so that the open end type has a quarter wavelength length at the resonance frequency reduced by the dielectric constant of the dielectric substrate. However, a resonator having a length of a half wavelength of a resonance frequency that is electromagnetically coupled to the antenna electrode may be used.

  Also, an example in which the electric field direction of the antenna electrode coincides with the electric field direction of resonance of the resonator is shown. In order to increase the degree of energy absorption in the resonance suppression element, a configuration in which the electric field directions match is desirable, but a configuration that does not match may be used depending on the setting of the suppression level of the resonance suppression operation.

  Furthermore, although the example provided with one kind of resonance suppression element was shown, you may provide a some resonance suppression element corresponding to the some frequency band shared. For example, in FIG. 4B, resonance suppression elements having different resonance frequencies may be provided on the back and front of the antenna electrode 101. In this case, the resonance operation of the broadband antenna can be suppressed for two types of frequency bands. Become.

(Embodiment 3)
Next, a third embodiment of the present invention will be described.
5 (a) is a perspective view from the front surface of the wideband antenna according to Embodiment 3 of the present invention, FIG. 5 (b) is a diagram showing the electrode on the front surface, FIG. 5 (c) is a diagram showing the electrode on the back surface, FIG. 5D is an enlarged sectional view around the antenna electrode.

  As shown in FIG. 5, the broadband antenna device 200 of the present embodiment uses a dielectric substrate 204 as a support substrate, and an antenna electrode 201 and a resonator electrode 203 are formed on the front and back surfaces of the dielectric substrate 204, and these are formed. The dielectric substrate 204 is connected at a high frequency through a through hole H provided in the dielectric substrate 204. Again, this broadband antenna device 200 includes an antenna electrode 201 made of a circular conductive material, and a resonator electrode having a resonance frequency within the frequency band of the antenna electrode and having a narrower frequency bandwidth than the antenna electrode. 203, comprising a resonance suppression element 202 connected to the antenna electrode 201 and suppressing the resonance operation of the antenna electrode within the resonance band of the resonator, and configured to suppress resonance in a desired frequency band. It is characterized by that.

  That is, the resonance suppression element 202 includes a resonator electrode 203 that is connected to the antenna electrode 201 through a through hole at a high frequency, and a dielectric substrate 204 made of a flat dielectric material having dielectric loss. The ground electrode 205 is the ground of the antenna electrode 201, and also serves as the ground of the feed line 206 made of a microstrip line that is an input / output line to the broadband antenna 200, and the dielectric substrate 204 also serves as the substrate of the feed line 206. The feed line 206 is connected to an external circuit via a coaxial connector 207.

  FIG. 6 shows an antenna electrode radius of 6.8 mm, a resonator electrode radius of 2.9 mm, a dielectric substrate thickness of 0.8 mm, a relative dielectric constant of 4, and a dielectric loss of tan δ = 0.02 for the broadband antenna of this embodiment. It is an example of the analysis result of the frequency characteristic of the antenna gain calculated | required by simulation on the conditions of a dielectric substrate size of 21 mm x 50 mm.

  According to such a configuration, the antenna electrode 201 operates as a monopole antenna with the feeder line 206 as the input / output line, the main electric field direction in the direction b in FIG. 5 and the ground electrode 205 as the ground. 6 exhibits a wide frequency characteristic of the frequency band f3 shown as an example in FIG. For the frequency component in the frequency band f4 in FIG. 6, the resonance suppression element 202 resonates in the electric field direction b in FIG. 6, and a part of the resonance energy is consumed by the dielectric loss of the dielectric substrate 204. As a result, the efficiency of the wideband antenna 200 decreases and the antenna gain of the frequency component decreases, and the frequency characteristics shown in FIG. 6 are obtained. By reducing the antenna gain, it is possible to suppress the emission of unnecessary noise power components in the case of a transmission operation, and to suppress reception of unnecessary noise components in the case of a reception operation.

  The antenna electrode 201, the resonator electrode 203, the ground electrode 205, and the feeding microstrip line 206 on the dielectric substrate 204 can be manufactured by the same manufacturing means as the planar circuit board, and the broadband antenna of this embodiment can be manufactured at low cost. Can be carried out.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described. FIG. 7A is a front view showing an antenna device according to Embodiment 4 of the present invention, FIG. 7B is an electrode diagram on the front surface, and FIG. 7C is an electrode diagram on the back surface. In FIG. 7, the same components as those in FIG. In FIG. 7, a second antenna electrode 210 having the same shape as the antenna electrode 201 is combined with the antenna electrode 201 to form a dipole antenna. The second antenna electrode is connected to the ground of the coaxial connector 207 at the end.

  With this configuration, the second antenna electrode 210 serves as a ground for the feed line 206 and a ground for the coaxial connector 207, and performs a balanced operation with reduced influence of an unbalanced external circuit connected to the feed connector 207. Antenna operation is possible.

  In this embodiment, a configuration example in which an external circuit is connected by a coaxial connector has been shown. However, a configuration in which an external circuit is formed directly on a dielectric substrate may be used, and from the viewpoint of sensitivity, it may be formed on the same substrate. Is desirable.

(Embodiment 5)
FIG. 8A is an enlarged surface view around the resonator electrode of the broadband antenna according to the fifth embodiment of the present invention, and FIG. 8B is a cross-sectional view. FIG. 9 is a functional block diagram around the high frequency F / E (front end) of the wireless communication device using the wideband antenna device according to the fifth embodiment of the present invention. 8 and 9, the same components as those in FIG.

  As shown in FIG. 8, the broadband antenna device 300 according to the embodiment of the present invention is obtained by adding a resonance suppression operation control means 301 to the resonance suppression electrode 203. The resonance suppression operation control means 301 is configured such that the DC potential of the resonator electrode 203 is equal to that of the ground electrode 205, the inductor 302 that separates the antenna electrode 203 from the ground electrode 205 in high frequency, and the resonator electrode 203 is connected to the antenna electrode 201. A coupling capacitor 303 that is connected in a high frequency manner and a switching diode that changes the connection state of the antenna electrode 201 and the resonator electrode 203 according to a change in applied voltage caused by an interference change signal that is a DC voltage supplied from the feeder line 206. 303 are mounted as chip elements.

  In FIG. 9, the broadband F / E 311 shares a part of the frequency band (band a) with a different type of wireless communication system. The frequency band is shared by the signal received by the broadband F / E 311 connected to the antenna 300. Further, the presence / absence of the system is determined by the interfering device detection unit 312, and the interference level change signal generation unit 313 changes the interference level to the resonance suppression operation control unit 301 in accordance with the output of the interfering device detection unit 312. Switch signals. The broadband F / E 311 has a port 314 that is an input / output port with an external circuit.

  With this configuration, the interfering device detection unit 312 receives a signal received by the wideband F / E 311 through the antenna 300, and determines the presence / absence of a heterogeneous wireless communication system sharing the frequency band based on the frequency component in the band a. .

  When there is a heterogeneous wireless communication system, an interference level change signal for performing a resonance suppression operation is output from the interference level change signal generation unit 313 to the resonance suppression operation control unit 301, and a negative voltage is applied to the feeder line 206. As a result, the switching diode 303 is reverse-biased. The switch diode 303 is in a high impedance state (for example, 1 kΩ) by being reverse-biased, and the resonator 202 resonates with respect to the frequency component in the band a. By partially absorbing the antenna 300, the gain of the antenna 300 in the band a is reduced, and the applied / interfered interference with different types of wireless communication systems sharing the band a can be reduced.

  When the heterogeneous wireless communication system does not exist, a positive voltage for forward biasing the switching diode 303 is applied to the feed line 206, the switching diode 303 becomes conductive, and the resonator 202 has a frequency component in the band a. On the other hand, it does not resonate and is not absorbed by the resonance suppression element.

  Note that such a broadband antenna 300 may have a dielectric substrate 204 formed large and a broadband F / E 311 mounted on the dielectric substrate as shown in FIG. . Thereby, it can form, without causing the enlargement of an apparatus.

  In addition, although the example of a structure of the resonance suppression operation control means using the diode for switching was shown, the same effect can be acquired even if it uses FET switch, and the implementation | achievement means of a switch is not limited.

  In addition, the configuration example in which the resonance suppression operation is stopped by the negative voltage has been shown. However, the same effect can be obtained even when a configuration in which the applied voltage is positive when the resonance suppression operation is performed corresponding to the connection direction of the diode. The sign of the applied voltage is not limited.

(Embodiment 6)
Next, a sixth embodiment will be described.
In the first embodiment, the resonator electrode 103 is electrically connected to the antenna electrode 101 through the through hole H. However, in this embodiment, the electric field is not directly connected as shown in FIG. You may make it connect by coupling | bonding.

  Here, FIG. 11A is a front view (partial cross-sectional view), FIG. 11B is a cross-sectional view from the side, and FIG. 11C and FIG.

In the present embodiment, the difference from the broadband antenna 100 of the first embodiment shown in FIG. 1 is that the resonator electrode 141 constituting the resonance suppression element 140 is electrically connected to the antenna electrode 101. There is no electric field coupling. Others are similarly configured.
The arrow in FIG. 11C is an example of a typical direction of the surface current of the antenna electrode 101 during antenna operation. The arrow in FIG. 11D is an example of a typical direction of the surface current flowing on the surface on the antenna electrode 101 side of the resonator electrode 141 at the same timing as in FIG.

  A typical direction of the surface current flowing on the surface on the antenna electrode side of the resonator electrode at the same timing as the typical direction A1 of the surface current on the antenna electrode is indicated by an arrow A3. Here, since the resonance suppression element 140 is electric field coupled to the antenna (antenna electrode 101) by the resonator electrode 141 that is electric field coupled to the antenna electrode, the comparison between FIG. 11 (d) and FIG. As is apparent, the direction A3 of the surface current flowing on the surface of the resonator electrode on the antenna electrode side is opposite to that formed by current coupling.

  According to such a configuration, the surface current distribution illustrated by arrows A1 and A3 in FIGS. 11 (c) and 11 (d) is generated, and the resonator electrode 141 constituting the resonance suppression element 140 has an electric field for the antenna operation of the antenna electrode. When coupled and resonated, a part of the signal energy of the frequency component is absorbed by the dielectric loss of the dielectric substrate 104, so that the efficiency of the wideband antenna 100 is lowered and the antenna gain is lowered.

(Embodiment 7)
Next, a seventh embodiment will be described.
In this embodiment, as shown in FIG. 12, multiband resonance suppression is possible. In this embodiment, the first resonator electrode 122 and the second resonator electrode 123 are the same. The resonance suppression element 121 is formed on the same surface with the dielectric substrate 124 interposed therebetween.
Others are formed in the same manner as in the first embodiment.

  According to this configuration, two bands of resonance can be suppressed by the dielectric loss due to the resonance frequency component due to the first resonator electrode 122 and the dielectric loss due to the resonance frequency component due to the second resonator electrode 123.

(Embodiment 8)
Next, an eighth embodiment will be described.
The present embodiment also enables multiband resonance suppression. As shown in FIG. 13A, the front view and FIG. The resonator electrode 132 and the second resonator electrode 133 are disposed on both surfaces of the antenna electrode 101 via the first dielectric substrate 134 and the second dielectric substrate 135, respectively. Is formed.
Others are formed in the same manner as in the first embodiment.

  Also with this configuration, it is possible to suppress resonance in two bands by the dielectric loss due to the resonance frequency component due to the first resonator electrode 132 and the dielectric loss due to the resonance frequency component due to the second resonator electrode 133. According to this configuration, the suppression frequency is controlled by the size and shape of the resonator electrode. Furthermore, the dielectric loss can be controlled by the material and thickness of the dielectric substrate, and the suppression frequency and the suppression force can be controlled independently.

  An antenna electrode or a resonator electrode may be formed by laminating a metal plate on the dielectric substrate, or the electrode may be formed by a thin film process. Furthermore, it is needless to say that a dielectric such as ferrite may be partially embedded in the alumina substrate and can be appropriately modified.

  The broadband antenna according to the present invention suppresses the resonance operation of the antenna in a predetermined frequency band, and reduces interference with a radio communication system sharing a part of the frequency band, thereby improving transmission power efficiency and reception sensitivity. Thus, it is possible to provide a wideband antenna that can realize a wireless communication device with improved performance. Further, the present invention can be applied to uses such as a multiband wireless communication apparatus corresponding to a plurality of frequency bands.

The figure which shows the wideband antenna in Embodiment 1 of this invention, (a) is a surface figure (partial perspective drawing), (b) is sectional drawing, (c), (d) is operation explanatory drawing. Frequency characteristics diagram of antenna gain by simulation analysis of wideband antenna in Embodiment 1 of the present invention The figure which shows the wideband antenna in Embodiment 2 of this invention, (a) is a surface figure, (b) is sectional drawing. The figure which shows the broadband antenna of the modification of Embodiment 2 of this invention, (a) (b) is sectional drawing of each example The figure which shows the wideband antenna in Embodiment 3 of this invention, (a) is a perspective view from the surface of a wideband antenna, (b) is the electrode figure of the same surface, (c) is the electrode figure of the same back surface, d) is an enlarged sectional view of the same. Frequency characteristics diagram of antenna gain by simulation analysis of wideband antenna in Embodiment 3 of the present invention The figure which shows the wideband antenna in Embodiment 4 of this invention, (a) is a perspective view from the surface of a wideband antenna, (b) is the electrode figure of the same surface, (c) is the electrode figure of the back surface The figure which shows the wideband antenna in Embodiment 5 of this invention, (a) is an enlarged surface view of a wideband antenna, (b) is an expanded sectional view. The figure which shows an example of the radio | wireless communication apparatus using the wideband antenna in Embodiment 5 of this invention. The figure which shows the example of mounting of the radio | wireless communication apparatus using the broadband antenna in Embodiment 5 of this invention The figure which shows the wideband antenna in Embodiment 6 of this invention, (a) is a surface figure (partial perspective view), (b) is sectional drawing, (c), (d) is operation explanatory drawing. The figure which shows the wideband antenna in Embodiment 7 of this invention The figure which shows the wideband antenna in Embodiment 8 of this invention, (a) is a surface view (partially see-through | perspective view), (b) is sectional drawing. The figure which shows the conventional broadband antenna, (a) is a front view (partially see-through | perspective view), (b) is sectional drawing.

Explanation of symbols

1 Radiation element 2 Ground
DESCRIPTION OF SYMBOLS 3 Feed line 4 High frequency power supply 100 Broadband antenna 101 Antenna electrode 102 Resonance suppression element 103 Resonator electrode 104 Dielectric substrate 105 Ground 106 Coaxial line 107 Port 110 Feed line 111 Port 200 Broadband antenna 201 Antenna electrode 202 Resonance suppression element 203 Resonator electrode 204 Dielectric substrate 205 Ground electrode 206 Feed microstrip line 207 Coaxial connector 210 Broadband antenna 211 Second antenna electrode 300 Broadband antenna 301 Resonance suppression operation control means 302 DC cut inductor 303 Coupling capacitor 304 Switch diode 311 Broadband F / E
312 Interfering device detection means 313 Interference degree change signal generation means

Claims (20)

An antenna electrode;
Resonant operation of the antenna electrode within the resonance band of the resonator connected to the antenna electrode, comprising a resonator having a resonance frequency within the frequency band of the antenna electrode and having a narrower frequency bandwidth than the antenna electrode A resonance suppression element for suppressing
An antenna device comprising: The antenna device according to claim 1,
The resonance suppression element is an antenna device that is current-coupled to the antenna electrode. The antenna device according to claim 1,
The resonance suppression element is an antenna device that is electric field coupled to the antenna electrode. The antenna device according to claim 1,
The resonance suppression element includes a resonator electrode electrically connected to the antenna electrode, and a dielectric substrate having a dielectric loss interposed between the resonator electrode and the antenna electrode. The antenna device according to claim 1,
The resonance suppression element includes a resonator electrode magnetically connected to the antenna electrode, and a dielectric substrate having a dielectric loss interposed between the resonator electrode and the antenna electrode. The antenna device according to claim 1,
The antenna device, wherein the resonator electrode is an isolated pattern. The antenna device according to claim 1,
An antenna device comprising resonance suppression operation control means for switching a resonance suppression operation of a resonance suppression element by controlling a resonance operation of the resonator. The antenna device according to claim 7, wherein
The resonance suppression operation control means is an antenna device connected between the resonator electrode and the antenna electrode. The antenna device according to claim 1,
The antenna device, wherein the resonance suppression element has a resistance load that reduces a resonance Q of the resonator. The antenna device according to claim 1,
An antenna electrode that is a monopole antenna; a dielectric substrate shared with a radio unit connected to the antenna device; a feed line that inputs and outputs a high-frequency signal between the antenna electrode and the radio unit; An antenna device comprising a ground electrode which is a ground of a line and also operates as a ground of the antenna electrode. The antenna device according to claim 1,
An antenna device comprising a second antenna electrode having a shape similar to that of an antenna electrode and serving also as a ground electrode that forms a dipole antenna together with the antenna electrode. The antenna device according to claim 1,
The antenna device, wherein the antenna electrode is a monopole antenna. The antenna device according to claim 1,
The antenna device, wherein the antenna electrode is a dipole antenna. The antenna device according to claim 1,
The antenna device is a circular electrode having a broadband characteristic. The antenna device according to claim 1,
An antenna device in which the resonator electrode is circular. The antenna device according to claim 1,
The antenna device, wherein the resonator electrode is a triangle. The antenna device according to claim 1,
The resonator device has a fan-shaped antenna device. An antenna device according to any one of claims 1 to 17,
A wireless unit that wirelessly communicates using a high-frequency signal within the band of the antenna device,
A wireless communication apparatus that suppresses an antenna gain within a frequency band of a resonance suppression element. An antenna device according to claim 7,
A wireless unit that performs wireless communication using a high-frequency signal within the band of the antenna device;
An interference level change signal generating means for generating a signal for controlling the resonance suppression operation control means of the antenna device to control the degree of interference given to different types of wireless communication systems;
A wireless communication device comprising: The wireless communication device according to claim 19,
A wireless communication apparatus comprising: an interference device detection unit that detects presence / absence of a different type of wireless communication system that may cause interference from a received signal and outputs an interference device determination signal to an interference level change signal generation unit.

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