JP2003347836A - Planar antenna device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an effective planar antenna device manufactured by using low-cost materials, and improved in productivity thereof, and capable of being effectively applied to a plurality of frequency bands. <P>SOLUTION: A cavity formed between a radiating element 1 and a ground conductive plate 4 functions as a low-loss dielectric by the reason of the cavity being a free space, having a dielectric constant of 1. Since the cavity functions to control the dielectric constant between the ground conductive plate 4 and the radiating element 1, a low-cost and general printed-circuit board having a high dielectric constant higher than that of the cavity can be used as a dielectric plate for supporting the radiating element 1. The same case is applied for forming the cavity between the radiating element 1 and a band-adjusting conductive element 3 or an unwanted radiation suppressing conductive plate 7. Since the radiating element 1 and the band-adjusting conductive element 3 or the unwanted radiation reducing conductive plate 7 can be produced by an etching process of the printed-circuit board, thereby the planar antenna device having high productivity can be obtained. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a planar antenna device.

[0002]

2. Description of the Related Art A planar antenna device used for microwaves, millimeter waves, or the like, has a dielectric plate on one side (front) of a ground conductor plate, a feeder substrate having a plurality of radiating elements formed thereon, and a dielectric plate. , An unnecessary radiation suppressing conductor plate having a slot formed at a position corresponding to the radiating element, a band adjusting element, and the like are sequentially laminated.

The radiating element of this planar antenna device is basically formed of a conductor so as to resonate with a half wavelength of a transmitting high-frequency signal and emit a radio wave.

[0004]

In this type of planar antenna device, a high quality and expensive material is used for the dielectric plate in order to reduce the loss and increase the efficiency. In addition, since it is necessary to accurately position and stack each plate or element, there is a problem that productivity is poor. Further, a general planar antenna device is configured to efficiently adapt to one frequency band.

[0005] Recently, a demand for a radio communication system using a plurality of frequency bands has been increasing, and a plurality of antenna devices are required to meet such demand.

[0006] However, installation of a plurality of antenna devices increases equipment costs. In order to reduce such equipment costs, it is desired that one planar antenna device can be efficiently applied to a plurality of frequency bands.

Therefore, one object of the present invention is to provide an efficient planar antenna device using inexpensive materials, and another object of the present invention is to improve the productivity of the planar antenna device. There is still another object of the present invention,
An object of the present invention is to provide a planar antenna device that can be efficiently applied to a plurality of frequency bands.

[0008]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 comprises a radiating element for radiating radio waves, and a ground conductor plate for reflecting radio waves radiated from the radiating elements. In the planar antenna device, the radiating element is formed on one surface of the dielectric plate, and the other surface of the dielectric is on the ground conductor plate side, and a gap is formed between the dielectric plate and the ground conductor plate. Are arranged.

In addition to the configuration described in claim 1, the radiating element of the planar antenna device according to claim 2 has a center conductor having a length of a half wavelength of a plurality of transmission high-frequency signals having different frequencies, and a center conductor. It is preferable to have a conductor portion integrally formed on both sides of the portion so as to be self-symmetric with respect to the central conductor portion.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the dielectric and the radiating element are preferably formed by processing a single-sided printed wiring board.

According to a fourth aspect of the present invention, in addition to the configuration of the first to third aspects, in addition to the configuration of the first to third aspects, the length of a half wavelength of each transmission high-frequency signal is independent on one surface side of the dielectric plate. The band adjusting conductor element formed of the conductor plate may be arranged to face the radiating element.

According to a fifth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, in addition to the configuration of the first to third aspects, it is unnecessary to suppress unnecessary radio waves from the radiating element on one surface side of the dielectric plate. A radiation suppression conductor plate may be provided.

According to a sixth aspect of the present invention, in addition to the configuration of the first to third aspects, a half-wavelength of each of a plurality of transmission high-frequency signals is provided on one surface side of the dielectric plate. Another dielectric plate with a band adjustment conductor element consisting of multiple conductors with independent lengths and an unnecessary radiation suppression conductor plate that suppresses unnecessary radio waves from the radiating element is placed in parallel with the dielectric plate It may be.

According to a seventh aspect of the present invention, in addition to the configuration of the sixth aspect, the band adjusting conductor element may be formed in a slot of the unnecessary radiation suppressing conductor plate.

The planar antenna device according to an eighth aspect may include a plurality of radiating elements, band adjusting conductor elements, and slots in addition to the configuration according to any one of the first to seventh aspects.

According to the present invention, since the air gap formed between the radiating element and the ground conductor plate is a free space having a dielectric constant of 1, the air gap functions as a low-loss dielectric. Since this gap functions to control the dielectric constant between the ground conductor plate and the radiating element, as a dielectric plate supporting the radiating element,
An inexpensive general printed wiring board having a higher dielectric constant than the gap can be used. The same applies when a gap is formed between the radiating element and the band adjusting conductor element or the unnecessary radiation suppressing conductor plate. Since the radiating element, the band adjusting conductor element, and the unnecessary radiation suppressing conductor plate can be processed by etching the printed wiring board, a highly productive planar antenna device can be obtained.

[0017]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view of the planar antenna device of the present invention.

The planar antenna device shown in FIG. 1 has a plurality (1 in FIG. 1) connected in parallel to a ground conductor plate 4 and a feed line 2.
Six are shown, but not limited. ) Of the first dielectric plate 5 on which the radiating elements 2 are formed, and a band adjusting conductor in a plurality of (sixteen in the figure, but not limited as long as the number is equal to the number of radiating elements) slots 7a. Screws 9 and nuts 10 as coupling members and a gap for forming a gap such that a gap is formed between the second dielectric plate 6 and the unnecessary radiation suppressing conductor plate 7 having the element 3. It is fixed with the spacers 8a and 8b and covered with the cover 11 (the coupling member is not limited to the screw 9 and the nut 10, but may be a split pin or an adhesive).

The ground conductor plate 4 is, for example, a silver-plated copper plate (or a silver-plated copper plate, a metal plate such as a rust-proofed copper plate).
In the four corners, through holes 4a through which the screw 9 can pass are formed, and holes 4b for connecting the coaxial cable 12 are formed. The numbers of the through holes 4a, the screws 9 and the nuts 10 are shown. The number is not limited.).

The power supply wiring 2 and the radiating element 1 are formed on the surface of a first dielectric plate (for example, Teflon (registered trademark)) 5 by a printed wiring technique. That is, the power supply wiring 2 and the radiation element 1 are obtained by etching a single-sided printed wiring board. At four corners of the first dielectric plate 5, through holes 5a through which screws 9 can pass are formed.

The band adjusting conductor element 3 and the slot 7a are formed on the surface of a second dielectric plate (for example, Teflon) 6 by a printed wiring technique. That is, the band adjusting conductor element 3
The slot 7a is obtained by etching a single-sided printed wiring board. At four corners of the second dielectric plate 6 and the unnecessary radiation suppressing conductor plate 7, through holes 6 through which screws 9 can pass.
a and 7b are formed.

The ground conductor plate 4, the first dielectric plate 5,
The spacers 8a, 8b are interposed at the four corners of the second dielectric plate 6 and the unnecessary radiation suppressing conductor plate 7, and the through holes 4a, 5a, 6
After passing through the screws 9 so as to penetrate the a and 7b and the spacers 8a and 8b, they are combined with a nut 10 and covered with a cover 11 made of a dielectric material (for example, Teflon) to obtain a planar antenna device. The cover 11 is attached so as to abut on the periphery of the ground conductor plate 4 to prevent rainwater or the like from entering.

Power is supplied to the power supply wiring 2 from the outside by the center conductor 12 a of the coaxial cable 12 penetrating the ground conductor plate 4.
In contact with the power supply wiring 2.

The ground conductor plate 4 of this planar antenna device,
The gaps formed between the first single-sided printed wiring board (radiating element 1) and the second single-sided printed wiring board (unwanted radiation suppressing conductor plate 7 and band adjusting conductor element 3) are free spaces. Therefore, it functions as a dielectric having a dielectric constant of 1 and low loss. This gap is formed between the first single-sided printed wiring board and the second single-sided printed wiring board.
Functions as a dielectric between the ground conductor plate 4 and the radiating element 1 and between the radiating element 1 and the unnecessary radiation suppressing conductor plate 7 and the band adjusting conductor element 3 together with the dielectric constituting the single-sided printed circuit board. I do.

The permittivity between the ground conductor plate 4 and the radiating element 1 and the permittivity between the radiating element 1 and the unnecessary radiation suppressing conductor plate 7 and the band adjusting conductor element 3 is determined by the permittivity of a gap interposed therebetween. Become dominant. Therefore, as the first and second dielectric plates, it is possible to use ordinary inexpensive dielectric plates of a printed wiring board having a higher dielectric constant than a gap.

According to such a planar antenna device, 2
It is possible to efficiently adapt to different frequency bands and suppress the emission of unnecessary radio waves. The radiating element, the band adjusting conductor element, and the unnecessary radiation suppressing conductor plate can be formed by etching the printed wiring board, so that a highly productive planar antenna device can be obtained.

Next, the radiating element will be described with reference to FIG.

FIG. 2 is a plan view of a radiating element used in the planar antenna device shown in FIG.

The radiating element 1 has two different frequency bands f
1 (wavelength λ1) and f2 (wavelength λ2, where f1 <f2) will be described with a conductor plate (for example, a silver-plated copper plate or a gold-plated copper plate).

The radiating element 1 transmits a transmission high-frequency signal (frequency f
With respect to the strip-shaped center conductor 1a having a half wavelength length (λ1 / 2) of 1), a half wavelength length (λ2 / 2) of a frequency f2 different from the transmission high-frequency signal (f1) is used. The two conductor portions 1b and 1c are integrally formed so as to be self-symmetrical. Between the conductors 1a, 1b and 1c, slit-shaped notches 1d and 1e are formed along the longitudinal direction of the center conductor 1a in order to separate the high-frequency signals f1 and f2 well.

When power is supplied to the radiating element 1 from the power supply wiring 2, the longer central conductor portion 1a of the radiating element 1 resonates with a signal in the low frequency band f1 and emits a radio wave in the low frequency band (in a direction perpendicular to the paper surface). ) Radiate, and the shorter conductor portions 1b and 1c of the radiating element 1 resonate with the signal in the high frequency band f2 and radiate radio waves in the high frequency band.

By constructing a planar antenna device using such a radiating element 1, radio waves in two frequency bands can be efficiently radiated from one planar antenna device.

Next, the band adjusting conductor element will be described with reference to FIG.

FIG. 3 is a plan view of the band adjusting conductor element used in the planar antenna device shown in FIG.

A case will be described in which the band adjusting conductor element is formed of a conductor plate (for example, a silver-plated copper plate or a gold-plated copper plate) so as to conform to two different frequency bands f1 and f2.

The band adjusting conductor element 3 is a strip-shaped conductor plate 3a having a half wavelength of the transmission high-frequency signal (f1).
And two strip-shaped conductor plates 3b and 3c independently disposed on both sides of the conductor plate 3a and having a half wavelength of the transmission high-frequency signal (f2). Band adjustment conductor element 3 is arranged to face radiating element 1.

For this reason, the band adjusting conductor element 3 functions so as to widen the bandwidth of the frequency band f1 by the central conductor plate 3a acting strongly on the signal in the lower frequency band f1, and the conductor plates 3a on both sides are provided. 3b, 3c is high frequency band f
By acting strongly on the signal on the second side, it functions to widen the bandwidth of the frequency band f2. Therefore, by using such a band adjusting conductor element, the usable frequency bandwidth of the planar antenna device is widened.

FIG. 4 is an exploded perspective view showing another embodiment of the planar antenna device of the present invention.

This planar antenna device has a ground conductor plate 4
And a plurality (16 in the figure) connected in parallel by a power supply wiring 2 formed on one side (upper side in the figure) of the first dielectric plate 5 by a printed wiring technique, but is not limited thereto. ), The unnecessary radiation suppressing conductor plate 7 formed on one surface (upper side in the figure) of the second dielectric plate 6 by the printed wiring technique, and one of the third dielectric plates 13 (FIG. Then, the band adjustment conductor element 3 formed by the printed wiring technique is superimposed on the surface (upper side) via spacers 8a, 8b, 8c so as to form a gap, and connected by screws 9 and nuts 10. Covered.

The first dielectric plate 5, the power supply wiring 2 and the radiating element 1 are formed by etching using a first single-sided printed wiring board, and the second dielectric plate 6 and the unnecessary radiation suppressing conductor plate are formed. 7 is formed by etching using a second single-sided printed wiring board, and the third dielectric plate 13 and the band adjusting conductor element 3 are formed by etching using a third single-sided printed wiring board. Is done.

Each radiating element 1 and band adjusting conductor element 3 are
Since the configuration is the same as that of FIGS. 2 and 3, the description is omitted.

Power is supplied from the outside of the planar antenna device to the power supply wiring 2 by connecting the center conductor 12 a of the coaxial cable 12 penetrating the ground conductor plate 4 to the power supply wiring 2.

According to this planar antenna device, the permittivity between the ground conductor plate 4 and the radiating element 1 and the permittivity between the radiating element 1 and the unnecessary radiation suppressing conductor plate 7 and the band adjusting conductor element 3 are between them. Since the intervening void is dominant, the first to third
As the dielectric, an ordinary inexpensive printed wiring board dielectric can be used.

With one planar antenna device, it is possible to efficiently adapt to two types of frequency bands, suppress the emission of unnecessary radio waves, and expand the frequency band. The radiating element 1, the feed wiring 2, the unnecessary radiation suppressing conductor plate 7 and the band adjusting conductor element 3 can be formed by etching using a single-sided printed wiring board, so that a highly productive planar antenna device is obtained. Can be.

FIG. 5 is an exploded perspective view showing another embodiment of the planar antenna device of the present invention.

This planar antenna device has a ground conductor plate 4
And a plurality (16, but not limited to, in the figure) formed on one (upper side in the figure) surface of the first dielectric plate 5 by a printed wiring technique and connected in parallel by the power supply wiring 2.
Radiating element 1, band adjusting conductor element 3 formed on one (upper side in the figure) surface of second dielectric plate 6 by a printed wiring technique, and printed wiring on one surface of third dielectric plate 13. The unnecessary radiation suppressing conductor plate 7 formed by the technique is overlapped via spacers 8a, 8b and 8c so as to form a gap in the same manner as in the planar antenna device shown in FIG. The cover 11
It is covered with.

The first dielectric plate 5, the power supply wiring 2 and the radiating element 1 are formed by etching using a single-sided printed wiring board, and the second dielectric plate 6 and the band adjusting conductor element 3 are formed on one side. The third dielectric plate 13 and the unnecessary radiation suppressing conductor plate 7 are formed by etching processing using a single-sided printed wiring board.

Each radiating element 1 and band adjusting conductor element 3 are
2 and 3 are omitted because they are the same as those shown in FIGS.

Power is supplied from the outside of the planar antenna device to the power supply wiring 2 by connecting the center conductor 12 a of the coaxial cable 12 penetrating the ground conductor plate 4 to the power supply wiring 2.

According to such a planar antenna device, the dielectric constant between the ground conductor plate 4, the radiating element 1, the band adjusting conductor element 3, and the unnecessary radiation suppressing conductor plate 7 is determined by the dielectric constant of the gap interposed therebetween. Because the rate is dominant, the dielectric can be a normal inexpensive printed wiring board dielectric.

As described above, one planar antenna device can efficiently adapt to two types of frequency bands, suppress the emission of unnecessary radio waves, and adjust the frequency band. Since the radiating element, the band adjusting conductor element and the unnecessary radiation suppressing conductor plate can all be formed by etching using a printed wiring board, the productivity can be improved.

[0053]

In summary, according to the present invention, the following excellent effects are exhibited. (1) An efficient planar antenna device can be provided using an inexpensive material. (2) The productivity of the planar antenna device can be improved. (3) A planar antenna device that can be efficiently applied to a plurality of frequency bands can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a planar antenna device according to the present invention.

FIG. 2 is a plan view of a radiation element used in the planar antenna device shown in FIG.

FIG. 3 is a plan view of a band adjusting conductor element used in the planar antenna device shown in FIG.

FIG. 4 is an exploded perspective view showing another embodiment of the planar antenna device of the present invention.

FIG. 5 is an exploded perspective view showing another embodiment of the planar antenna device of the present invention.

[Explanation of symbols]

1 radiating element 2 Power supply wiring 3 Band adjustment conductor element 4 Ground conductor plate 5 First dielectric plate 6. Second dielectric plate 7 Unwanted radiation suppression conductor plate 7a slot 8a, 8b, 8c Spacer 9 screws 10 nuts 11 Cover 12 Coaxial cable 12a center conductor 13 Third dielectric plate

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Seiji Kado             1-6-1 Otemachi, Chiyoda-ku, Tokyo Sun             Standing wire company (72) Inventor Hiroaki Sato             One share of 3-1-1 Asahigaoka, Hino-shi, Tokyo             Toshiba Hino Plant F term (reference) 5J021 AA09 AA11 AB06 CA01 HA05                       JA02 JA03                 5J045 AA02 AA03 AB06 DA10 EA08                       GA03 HA06 KA02 NA01                 5J046 AA15 AA19 AB03 AB13 RA05                       RA06

Claims (8)

[Claims] 1. A planar antenna device comprising: a radiating element for radiating radio waves; and a ground conductor plate for reflecting radio waves radiated from the radiating elements, wherein the radiating element is formed on one surface of a dielectric plate. A planar antenna device, wherein the dielectric plate is arranged such that the other surface of the dielectric is on the ground conductor plate side and a gap is formed between the dielectric conductor and the ground conductor plate. 2. The radiating element according to claim 1, wherein said radiating element is a central conductor having a length of 波長 wavelength of a plurality of transmission high-frequency signals having different frequencies, and is self-symmetric with respect to said central conductor on both sides of said central conductor. And a conductor portion integrally formed as described above.
A planar antenna device according to claim 1. 3. The planar antenna device according to claim 1, wherein the dielectric and the radiating element are formed by processing a single-sided printed wiring board. 4. A band adjusting conductor element formed of an independent conductor plate having a half wavelength of each transmission high-frequency signal is disposed on one surface side of the dielectric plate so as to face the radiating element. The planar antenna device according to any one of claims 1 to 3, wherein: 5. The planar antenna according to claim 1, wherein an unnecessary radiation suppressing conductor plate for suppressing unnecessary radio waves from the radiating element is disposed on one surface side of the dielectric plate. apparatus. 6. A band adjusting conductor element comprising a plurality of conductors each having a half wavelength of each of said plurality of transmission high-frequency signals and being independent on said one surface side of said dielectric plate; 4. The planar antenna device according to claim 1, wherein another dielectric plate on which an unnecessary radiation suppressing conductor plate for suppressing unnecessary radio waves is formed is arranged in parallel with the dielectric plate. 7. The planar antenna device according to claim 6, wherein the band adjusting conductor element is formed in a slot of the unnecessary radiation suppressing conductor plate. 8. The planar antenna device according to claim 1, comprising a plurality of said radiation elements, said band adjustment conductor elements, and said slots.