JP2003101334A - Flat plate antenna and electric device having the same - Google Patents

Abstract

(57) [Abstract] [Problem] To be built in a portable terminal, an electric appliance, a wall, or the like in a space-saving manner, low cost and performance are ensured, and further, the influence of a metal housing in the product, a hand of a user, and the like. To provide a flat antenna capable of sufficiently coping with the above and electric equipment provided with the flat antenna. A radiating element portion is formed as a slit portion with a predetermined width and length so as to form a radiating element portion, and another portion of the conductive flat plate is grounded. Part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a flat plate antenna which is composed of a conductive flat plate, is small and thin, and can be easily incorporated in an electric device such as a mobile terminal or an electric appliance, a wall or the like, and a flat antenna. Regarding electrical equipment.

[0002]

2. Description of the Related Art In recent years,
Except for large antennas for base stations and satellite broadcasting, miniaturization of various dedicated antennas such as mobile phones and mobile computers (hereinafter collectively abbreviated as mobile terminals) has been actively performed. In particular, an antenna for a mobile terminal, which is required to be downsized, has problems such as a space for installation and a demand for performance contrary to the restriction of the antenna volume, as the terminal itself is downsized. Also, in the wireless network concept in the home, which has been actively studied recently, with the introduction of antennas on the interior wall surface and the introduction of antennas to personal computers and electric appliances (hereinafter collectively referred to as electric appliances), etc. However, the antenna has some problems such as a space for installation and a performance requirement contrary to the restriction of the antenna volume.

The above-mentioned problem is to secure a new dedicated space when a dedicated antenna is built in the casing or body case (hereinafter collectively referred to as the casing) of a mobile terminal or an electric appliance. It has to be a factor. Further, when the product is made smaller and lighter, it is naturally necessary to make the antenna itself smaller and lighter, which makes it difficult to satisfy the required antenna performance. In other words, it is necessary to secure a proper installation space in the housing in order to incorporate the antenna in the housing and ensure the performance, and as a result, it is necessary to manufacture the product by changing the specifications used so far. This will lead to higher costs and longer development periods. Furthermore, in order to maintain its strength and to prevent electromagnetic interference, the inside of the housing uses a metal housing even if it is made of plastic, etc. The interference with the housing of the above appears remarkably, and it becomes difficult to find the target characteristics. In a mobile terminal or the like, the mounting position of the antenna is greatly restricted near the antenna due to the influence of the user's hand. Therefore, in order to avoid this problem, most of the external antennas use a separate housing outside the housing of the main body and are attached by using a separate cable or the like. However, with this method, when moving the mobile terminal or electric appliance, it is often necessary to remove the external antenna once, and there is also the trouble of re-installation and readjustment, and in some cases wiring of cables etc. The user is always annoyed by an antenna failure due to an unexpected trouble, and the freedom of installation position of these mobile terminals and electric appliances is limited.

From the above, each dedicated antenna built in a portable terminal or a home electric appliance for wireless network at home can be easily introduced without increasing the manufacturing cost of the product or prolonging the development period. It must be able to cope with the influence of the metal casing in the product and the hand of the user. Further, it is intended to reduce the troublesomeness of the user, and the antenna itself needs to be low in cost.

The object of the present invention is to save space and to be built in a portable terminal, an electric appliance, a wall, etc., at a low cost and with high performance, and further, to be influenced by a metal casing in the product and a user's hand. Another object of the present invention is to provide a flat plate antenna that can sufficiently deal with the above and an electric device including the flat plate antenna.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has a structure in which a portion of a conductor flat plate constitutes a radiating element portion, and the radiating element portion is perforated with a predetermined width and length. The flat plate antenna is characterized in that the slit part is formed and the other part of the conductor flat plate is formed as a ground part.

The present invention is also a flat plate antenna characterized in that the radiating element section and the slit section constitute a radiating section of the antenna, and power is radiated from the radiating section.

Further, it is preferable that the length and width of the radiating element portion are set so as to obtain a predetermined excitation characteristic and a predetermined directional characteristic.

Further, it is preferable that the size of the slit portion is determined so that a predetermined excitation characteristic and a predetermined directivity characteristic can be obtained.

The length of the radiating element portion may be set to an odd multiple of approximately ¼ wavelength of the operating frequency.

Further, the length of the radiating element portion may be determined in consideration of the size of the slit portion.

Further, according to the present invention, by the slit portion,
The flat antenna is characterized by increasing the electric capacity and suppressing the influence of electric interferences existing in the horizontal and vertical directions of the radiation plane.

Further, according to the present invention, a part of the conductor flat plate is bent, and the ground portion is arranged on the back surface of the radiating portion.
It is characterized in that the electric capacity between them is increased to suppress the influence of the electric interference present on the back surface of the radiation part.

A dielectric material may be filled between the radiating portion and the ground portion.

Further, a metal part which is in contact with the ground portion may function as a part of the ground portion.

A power supply line for supplying power to the antenna may be in contact with and electrically connected to the radiating element section and the ground section.

Further, the wiring pattern formed on the substrate may be used as a feeding line to the antenna, and the feeding line may be electrically connected to the radiating element section and the ground section.

A coaxial line having an inner conductor formed of a single wire or a plurality of twisted wires and an outer conductor located on the outer periphery of the inner conductor is used as a power feeding line to the antenna, and the radiating element portion and the ground portion are provided with the The inner conductor and the outer conductor at one end of the coaxial line may be connected to each other.

Further, the present invention is an electric device provided with the flat plate antenna.

In the above structure, the size of each of the slits, the shape of the hollow, and the width of each of the conductor portions around the hollow forming the hollow so that a predetermined excitation characteristic and a predetermined directivity characteristic can be obtained. Has been defined.

Further, in order to obtain a predetermined excitation characteristic and a predetermined directivity characteristic, the radiating element portion has its shape, the length and width of each portion, and the distance between the outer periphery thereof and the edge of each portion of the hollowed portion defined. ing.

When a part of the conductor flat plate is bent in the direction parallel to the radiating portion or when a dielectric material is filled between the two so as to obtain a predetermined excitation characteristic and a predetermined directional characteristic, the conductor plate is bent. The size of the conductor plate, the distance between the radiating portion and the conductor plate, the dielectric constant and material of the dielectric material, and the shape of the portion formed of the dielectric material are defined.

The hollow structure covers the periphery of the radiating element portion, and electrically protects the radiating element portion from electrical interferences such as metal existing in the horizontal and vertical directions of the radiation portion plane. I have to.

When a part of the conductor flat plate is bent in the direction opposite to the radiating part, the electric capacity is increased in the space formed by the radiating part and the bent conductor flat plate, and the flat surface of the radiating part is formed. The radiating element portion is protected from the electric interference present in the depth direction of the radiating element. Alternatively, the radiating element part is electrically protected also from an electric interference object such as metal existing adjacent to or in the vicinity of the bent conductor flat plate.

When a part of the conductor flat plate is bent in the direction opposite to the radiating portion, when the bent conductor flat plate comes into contact with or interferes with the metal in the housing, the metal part is connected to the ground of the antenna itself. It can be used as a department.

When a part of the conductor flat plate is bent in a direction opposite to the radiating part and the space formed by the radiating part and the bent conductor flat plate is filled with a dielectric material, the dielectric material is dielectric. The effect of the ratio is to electrically increase the electric capacity and the distance between them.

The contents relating to the above structure are also adapted so that when the flat plate antenna of the present invention is applied to the working frequency, it can be flexibly adapted to obtain a predetermined excitation characteristic and a predetermined directional characteristic.

Here, when the flat antenna of the present invention is built in a housing, the working frequency is a working frequency determined by the position where the housing is built in, and the flat antenna of the present invention is laid on a wall or the like. In this case, it is the operating frequency determined under the installation condition.

The flat antenna of the present invention is small and thin so that it can be installed even in a space such as a gap in a housing of a portable terminal, etc., and it is low in cost, and can be installed in a horizontal plane of a built-in product. It has a function that it can operate omnidirectionally.

Further, according to the above-mentioned structure, since the influence of an electric interference material such as metal existing in the periphery other than the front surface of the radiating part is small due to the structure, when the metal parts are built in a housing which is often used. However, it can be used without significantly impairing the antenna characteristics.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the structure of two types of flat plate antennas 7 of the present invention. In the flat plate antenna of the present invention, as shown in FIG. 1, the conductor flat plate 1 is hollowed out, and the remaining portion forms the L-shaped radiating element portion 2, and the hollowed outer periphery around the radiating element portion 2 is formed. The remaining portion of the conductor flat plate 1 is used as the ground portion 3 of the antenna, and the slit portion 4 is formed so as to cover the portion formed by the radiating element portion 2 and the ground portion 3.
In the flat plate antenna 7 of the present invention, the radiation element section 2 and the slit section 4 constitute a radiation section 5 of the antenna itself. Electric power for one frequency is radiated from the radiation unit 5. At this time, the length of the radiating element portion 2 is set to an odd multiple of approximately ¼ of the wavelength at the operating frequency, but the width of the radiating element portion 2 and the electrical capacitance depending on the size of each portion of the slit portion 4 are Each size is finally determined according to the trade-off of (1) and the required antenna characteristics. Then, by covering the radiation portion 5 with the ground portion 3, the radiation element portion 2 is electrically protected from electrical interferences such as metal existing in the horizontal and vertical directions of the plane in which the radiation portion 5 exists. Makes it possible.

FIG. 2 shows a structural diagram of three types of flat plate antennas 71 in which the flat plate antenna of the present invention is bent in a U-shape. At this time, the length of the radiating element portion 2 is set to be an odd multiple of approximately ¼ of the wavelength at the operating frequency, and the width of the radiating element portion 2 and the electric capacity depending on the size of each portion of the slit portion 4 and Each size is finally determined according to the balance between the electric capacity in the space formed by the radiating portion 5 and the bent conductor flat plate 1, and the required antenna characteristics. With this structure, it is possible to protect the radiating element section 2 from the electric interference present in the vicinity of the bent conductor flat plate 1 on the back surface of the radiating section 5.

Incidentally, the flat plate antennas 7, 71 of the present invention described above.
The power feeding to the power source is performed by a power feeding method described later in consideration of impedance matching.

Further, a conductor portion which is formed in a direction different from the length direction of the radiating element portion 2 and which connects the radiating element portion 2 and the ground portion 3 formed by the hollowing is provided as a part thereof. It is preferable that one radiating section is electrically configured so that the radiating element section 2 and the radiating section radiate electric power for one frequency.

A conductor flat plate 1 bent in a U shape in FIG.
The structural diagram of three types of flat plate antennas 72 of the present invention in which a dielectric block 8 made of a dielectric material is sandwiched between is shown. By sandwiching this dielectric block 8, it is possible to reduce the size of the entire antenna due to the effect of the dielectric constant ε of the dielectric block 8, and between the conductor flat plates 1 bent in a U shape. The electrical distance of the space is proportional to the dielectric constant, and at the same time, the electrical capacity of the slit portion 4 increases. As a result, the periphery of the radiating portion 5 including the radiating element portion 2 and the slit portion 4 is electrically protected by the conductor flat plate 1 forming the ground portion 3,
A flat plate antenna 72 is realized which is less affected by electrical interferences such as metal existing in the periphery other than the front surface of the radiation unit 5.

The spaces formed by the above-described L-shape and the shape of the hollowed-out portion need not always be parallel with each other at the same distance.

A conductor plane formed on an insulating base may be used as the conductor flat plate.

The conductor plane can be formed by a processing method such as applying a plating material or the like on the base.

FIG. 4 shows two types of flat plate antennas 7 of the present invention,
71 shows an example of a coaxial line connection. In FIG. 4, in both parts divided into the radiating element part 2 and the ground part 3,
A part of the radiating element 2 and the inner conductor 61 of the coaxial line 6 are connected at a position in consideration of impedance matching, and an outer conductor 62 of the coaxial line 6 and a part of the ground part 3 are connected to form a power feeding structure. is doing. Note that these connections may be performed by fusion splicing with a conductive solder material or the like, or a dedicated connector or stay having a shape capable of retaining conductivity. Then, by modifying the power feeding structure, a contact type or a board-mounted type power feeding method can be used.

Also, one end of the coaxial line 6 used in the flat plate antenna of the present invention is connected to a power feeding circuit separately provided in a product incorporating the flat plate antenna or its relay circuit to have a function as a power feeding line. By making it small,
In addition, it is possible to realize a flat plate antenna that is thin and has a large degree of freedom in installation.

Further, since the coaxial line 6 is used as the power feeding line, it is possible to
This power supply line can be freely routed inside the main body so as not to get in the way.

Further, the conductor line formed by processing a part of the radiating element portion 2 having the L-shape or the like and integrally forming with the radiating element portion 2 having the L-shape or the like. May be a part of the feed line to the antenna configured in an L shape or the like.

Further, a part of the ground portion 3 formed by hollowing out the conductor flat plate 1 is processed to form an L-shaped conductor line integrally formed with the ground portion 3 formed in a U shape. It may be a part of the feed line to the antenna configured in the above shape.

Further, in order to feed power to the antenna achieved by the radiating element portion 2 having the above-mentioned L-shape or the like and the ground portion 3 formed by boring, another feeding line comes into contact with the antenna to electrically feed the antenna. May be connected to.

Further, the wiring pattern formed on the substrate is used as a feeding line to the antenna, and the feeding line is electrically connected to the radiating element portion having the above-mentioned L shape and the ground portion formed by the hollowing. May be connected to.

According to the above-mentioned configuration, there is no need to make major changes to the specifications such as the product housing of wireless home appliances for mobile terminals and homes for home use and the installation positions of various parts.
Furthermore, it is possible to realize a flat plate antenna that can be built in even in a space around the inside of the housing, at low cost, and whose performance is ensured.

Furthermore, since the above-mentioned flat plate antenna is structurally less affected by electrical interferences such as metal existing in the periphery other than the front surface of the radiating portion, it is flexible to be built in a case where many metal parts are used. It is possible to realize a built-in antenna that is compatible with the above and expands the freedom of selection regarding the built-in position.

If the flat plate antenna is installed inside a portable terminal or a home electric appliance for wireless network at home,
When moving these products, remove the annoyance of external users, re-installation and re-adjustment, and eliminate the annoyances that users always have such as antenna failures due to cable routing and unexpected troubles. Due to the high-quality characteristics of the present invention, it is possible to realize an effect that the degree of freedom in selection regarding the product installation position can be widened.

FIG. 5 shows the flat plate antennas 71 and 72 of the present invention.
FIG. 1 is a schematic view of a general notebook type personal computer (hereinafter, abbreviated as a notebook type personal computer) having a built-in LCD housing. Like the portions indicated by circles in the figure, the flat plate antennas 71 and 72 of the present invention can be mounted irrespective of the characteristic of the material of the housing such as metal or plastic, and further, regardless of the built-in position. And the flat plate antenna 7 of the present invention
Reference numerals 1 and 72 realize good antenna characteristics with little electrical interference with the metal LCD frame installed in the LCD housing 9. Further, the flat plate antennas 71, 7 of the present invention
2 and the metal LCD frame installed in the LCD housing 9 are in contact with each other, the metal LCD frame functions as the ground of the flat plate antennas 71 and 72 of the present invention, so that good antenna characteristics can be obtained. realizable. Actually, the front faces of the flat antennas 71 and 72 of the present invention are covered with a plastic cover.

FIG. 6 shows a general view of a general notebook type personal computer in which the flat plate antennas 71 and 72 of the present invention are installed in an LCD housing. Like the portions indicated by circles in the figure, the flat plate antennas 71 and 72 of the present invention can be mounted irrespective of the characteristic of the material of the housing such as metal or plastic, and further, regardless of the built-in position. And the flat plate antenna 7 of the present invention
Nos. 1 and 72 can realize good antenna characteristics with little electric interference even if the LCD housing 9 is made of metal.
When the D casing 9 is made of metal, this metallic casing can be used as a part of the ground of the antenna. Actually, the front faces of the flat antennas 71 and 72 of the present invention are covered with a plastic cover.

FIG. 7 shows a flat panel antenna 73 of the present invention as an LCD.
The figure below shows a general view of a general laptop computer that is integrated by processing the case. The flat antenna 73 of the present invention has a wide selection of processing locations as shown by a circle in the drawing, and the entire metal LCD housing 91 can be used as a ground portion of the antenna. . Further, when the electric interference between the flat panel antenna 73 of the present invention and the metal LCD frame installed in the LCD housing 91 is large, the distance between them is kept or a dielectric block is placed between them. By installing the flat antennas 71 and 72, it is possible to obtain the same effect as that when the flat plate antennas 71 and 72 are used, and good antenna characteristics can be realized. Actually, the front surface of the flat antenna 73 of the present invention is covered with a plastic cover.

FIG. 8 shows the flat plate antennas 71 and 72 of the present invention.
FIG. 2 is a schematic view showing the case where is installed in the metal frame 11 inside the keyboard housing 10 of the notebook computer 12. In this case, the flat plate antennas 71 and 72 of the present invention can use the metal frame 11 as a part of the ground of the antenna. Further, by providing the bent portions of the conductor flat plates constituting the flat plate antennas 71 and 72 of the present invention on the upper portion, it is possible to suppress a change in the resonance frequency of the antenna itself due to the approach or contact of the user with the flat plate antennas 71 and 72. , Good antenna characteristics can be realized. Further, even when the LCD casings 9 and 91 are in contact with the keyboard casing 10 (the notebook personal computer 12 is closed), similarly good antenna characteristics can be realized. Actually, the front faces of the flat antennas 71 and 72 of the present invention are covered with a plastic cover.

According to the above-described flat plate antenna of the present invention,
Instead of an external antenna that is attached using a separate housing, etc. outside the main body housing used for mobile terminals and home wireless network devices (electric appliances) according to the conventional technology, This eliminates the hassle of removing, re-installing, and re-adjusting the antenna that occurs when moving, and prevents damage to the antenna itself, further expanding the flexibility of the installation location of mobile terminals and appliances, and further reducing the manufacturing cost of the product. Without changing the specifications such as the installation position of the case and various parts that cause the improvement of the product and the extension of the development period. Since it is secured and is less affected by electrical interferences such as metal existing around the structure other than the front surface of the radiation part, it can be installed in a case where many metal parts are used. It becomes possible to provide an antenna that can be used without destroying large characteristic even when.

[0055]

In summary, according to the present invention, a housing which can be built in a portable terminal, an electric appliance, a wall, or the like in a small space, has a low cost and ensures the performance, and in which many metal parts are used. It is possible to provide a flat plate antenna that facilitates incorporation into the body and an electric device including the flat plate antenna.

[Brief description of drawings]

FIG. 1 is a structural diagram of a flat plate antenna of the present invention.

FIG. 2 is a structural diagram in which the flat antenna of the present invention is bent in a U-shape.

FIG. 3 is a structural diagram of a flat plate antenna of the present invention in which a dielectric block is sandwiched between conductor flat plates bent in a U shape.

FIG. 4 is a diagram showing a coaxial line connection example of the flat plate antenna of the present invention.

FIG. 5 is a schematic view of a general notebook personal computer in which the flat plate antenna of the present invention is built in an LCD housing.

FIG. 6 is a schematic view of a general notebook personal computer in which the flat panel antenna of the present invention is installed in an LCD housing.

FIG. 7 is a schematic view of a general notebook personal computer in which the flat panel antenna of the present invention is integrated by processing an LCD casing.

FIG. 8 is a schematic view of a general notebook personal computer in which the flat plate antenna of the present invention is installed in a keyboard housing.

[Explanation of symbols]

1 conductor flat plate 2 Radiating element 3 ground section 4 slit part 5 Radiator 6 coaxial lines 61 Inner conductor of coaxial line 62 Outer conductor of coaxial line 7,71-73 Flat plate antenna 8 Dielectric block 9 LCD housing 10 keyboard housing 11 Metal frame inside keyboard housing 12 notebook computer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinichiro Suzuki             1-6-1, Otemachi, Chiyoda-ku, Tokyo             Standing Wire Co., Ltd. (72) Inventor Naofumi Tate             1-6-1, Otemachi, Chiyoda-ku, Tokyo             Standing Wire Co., Ltd. F-term (reference) 5J045 AB05 AB06 BA01 DA08 HA06                       LA01

Claims (14)

[Claims] 1. A slit portion is formed by hollowing out the periphery of the radiating element portion with a predetermined width and length so that a part of the conductor flat plate forms a radiating element portion, and the other portion of the conductor flat plate is a ground portion. Is a flat plate antenna. 2. The flat antenna according to claim 1, wherein the radiating element portion and the slit portion constitute a radiating portion of the antenna, and power is radiated from the radiating portion. 3. The flat plate antenna according to claim 1, wherein the radiating element portion has a length and a width so as to obtain a predetermined excitation characteristic and a predetermined directional characteristic. 4. The flat plate antenna according to claim 1, wherein the size of the slit portion is determined so that a predetermined excitation characteristic and a predetermined directional characteristic can be obtained. 5. The flat plate antenna according to claim 1, wherein the length of the radiating element portion is set to an odd multiple of approximately ¼ wavelength of the operating frequency. 6. The flat plate antenna according to claim 1, wherein the length of the radiating element portion is determined in consideration of the size of the slit portion. 7. The slit section increases the electric capacity and suppresses the influence of electric interferences existing in the horizontal and vertical directions of the plane of the radiation section. The flat plate antenna described in. 8. A part of the conductor flat plate is bent, the ground portion is arranged on the back surface of the radiating portion to increase the electric capacity between the two, and the influence of an electrical interference present on the back surface of the radiating portion. The flat plate antenna according to any one of claims 2 to 7, wherein 9. A flat plate antenna according to claim 8, wherein a dielectric material is filled between the radiation portion and the ground portion. 10. The flat plate antenna according to claim 1, wherein a metal part in contact with the ground portion functions as a part of the ground portion. 11. The radiating element portion and the ground portion,
The flat plate antenna according to any one of claims 1 to 10, wherein a feed line for feeding power to the antenna is in contact with and electrically connected. 12. The wiring pattern formed on a substrate is used as a power supply line to an antenna, and the power supply line is electrically connected to the radiating element section and the ground section. 10. The flat plate antenna according to any one of 10. 13. A coaxial line having an inner conductor composed of a single wire or a plurality of twisted wires and an outer conductor located on the outer periphery of the inner conductor is used as a power supply line to an antenna, and the radiating element part and the ground part are provided with the coaxial line. 11. The flat plate antenna according to claim 1, wherein an inner conductor and an outer conductor at one end of the coaxial line are connected to each other. 14. An electric device provided with the flat plate antenna according to claim 1.