JPH11136024A - Plane antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plane antenna which is excellent in making itself thin and light and also makes an assembly process convenient. SOLUTION: This plane antenna laminates a ground conductor 1, a dielectric 5a, a feeding substrate 6 which forms plural radiation elements 8 and feeding lines 9 that are connected to the elements 8, a dielectric 5b and a conductor plate 7 that forms plural slots 10 at places that correspond to the elements 8 in the order. Here, as a fixture 2 which fixes each of the parts, it has a fixture 2 which is provided with a bottom 2a, side plates 2b which rise vertically from the bottom 2a on the two opposing side of the bottom 2a and fixing pieces 2c which project inward and are provided at the top end of the plates 2b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar antenna used for transmitting and receiving microwaves and millimeter waves.

[0002]

2. Description of the Related Art In a planar antenna, as a method of reducing the loss of a feed line and increasing the efficiency, as shown in FIG.
A feeder board 6 on which a ground conductor 1, a dielectric 5a, a plurality of radiating elements 8 and a feeder line 9 connected to the radiating elements 8 are formed, a dielectric 5b, and a slot 10 at a position corresponding to the radiating element 8; There is known a planar antenna having a triplate structure in which a plurality of conductive plates 7 are stacked in this order.

In recent years, small and lightweight planar antennas have
It has also begun to be used in high frequency fields, and such planar antennas require high assembly accuracy. Therefore, at present, the dielectric 5a, the power supply substrate 6,
Since the screw 11 as shown in FIG. 5 is used to fix the dielectric 5b and the conductor plate 7, a female screw must be formed in the ground conductor 1, and a certain thickness is required. .
Therefore, the thickness and weight of the ground conductor 1 are inevitable. The ground conductor 1 is manufactured by a method such as cutting or die casting with high working accuracy.

[0004]

As a method of controlling the direction of the main beam of the antenna using such an antenna, there is a method of mechanically rotating the antenna. Since this method is usually performed outdoors, the equipment must be easily transported and installed, the power of the power supply is often limited, and the response speed of the following operation is high. Therefore, it is necessary to reduce the thickness and weight of the antenna as much as possible and to reduce the load on the drive unit for rotating the antenna.

Further, if screws 11 are used to fix the dielectric 5a, the power supply board 6, the dielectric 5b, and the conductor plate 7 to the ground conductor 1, it takes a long time to manufacture. Is required to be simplified.

SUMMARY OF THE INVENTION An object of the present invention is to provide a planar antenna which is excellent in thickness reduction and weight reduction and can simplify an assembling process.

[0007]

As shown in FIG. 1, an antenna provided by the present invention comprises a ground conductor 1, a derivative 5a,
A feed board 6 having a plurality of radiating elements 8 and a feed line 9 connected to the radiating elements 8, a dielectric 5 b, and a conductor plate 7 having a plurality of slots 10 formed at positions corresponding to the radiating elements 8. And planar antennas stacked in this order, and as a fixture 2 for fixing these components,
A bottom surface portion 2a and a bottom surface portion 2a on two opposite sides of the bottom surface portion 2a.
And a fixing tool 2 having a fixing piece 2c provided at the upper end of the side plate 2b and protruding inward.

[0008] In the present invention, the ground conductor 1, the derivative 5
a, the power supply board 6, the dielectric 5b, and the conductor plate 7 are stacked in this order, and sandwiched between the bottom surface 2a of the fixture 2 and the fixing piece 2c. The height of the side plate 2b is such that the fixing piece 2 is sandwiched between the ground conductor 1, the dielectric 5a, the power supply board 6, the dielectric 5b, and the conductor plate 7.
It is prepared so that c is elastically fixed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, a fixture 2 of the present invention can form a plating film 4 on the entire surface thereof and can also serve as a ground conductor 1.

The fixing piece 2c of the present invention, as shown in the enlarged view of a portion C in FIG. 3, forms an acute angled slope 12 from the surface to be fixed toward the upper end of the side plate 2b so that the radiating element 8 is edged. It is preferable to dispose it in a place close to the above, because it does not hinder transmission and reception of radio waves.

The fixture 2 of the present invention has a bottom surface 2a.
Then, if a waveguide 13 for attaching a coupler for coupling from the feeder line 9 for input / output to the waveguide or a converter for directly converting the frequency is insert-molded, assembly is simplified. preferable.

[0012]

【Example】

Example 1 As shown in FIG. 1, an aluminum plate having a thickness of 0.3 mm was used for a ground conductor 1, and a bottom 2 a and a bottom 2 a on two opposite sides of the bottom 2 a were used for a fixture 2. A 1 mm thick molded article made of a polypropylene resin having a side plate 2b rising vertically from above and a fixing piece 2c protruding inward provided at an upper end portion of the side plate 2b, which is formed by insert-molding the waveguide 13. On the power supply board 6, unnecessary radiating elements 8 and power supply lines 9 were formed by etching and removing unnecessary copper foils of a flexible copper-clad laminate film in which a copper film of 18 μm in thickness was bonded to a polyimide film of 25 μm in thickness. Was used. The radiating element 8 had a square patch shape, and the length of one side was 0.39 times the free space wavelength λ ₀ of the used frequency. The arrangement interval was 0.91 times the free-space wavelength λ ₀ , and the number of elements was 16 × 24. The conductor plate 7
The slot 10 is made of aluminum having a thickness of 0.6 mm.
One side has a square shape of 0.51 times the free space wavelength λ ₀ , and the arrangement interval is the same as that of the radiating element. In addition, a resin foam having a thickness of 0.3 mm and a relative dielectric constant of 1.1 was used as the dielectrics 5a and 5b. In this way,
An antenna having the directivity shown in FIG. 4 was constructed.

Embodiment 2 As shown in FIG. 2, the fixture 2 of Embodiment 1 has a thickness of 1 mm.
An ABS resin molded product obtained by insert-molding the waveguide 13 and having a plating film 4 formed by electroless copper plating with a thickness of 20 μm on the surface thereof was used instead of the ground conductor 1. The power supply substrate 6 was a flexible laminated film in which a 50 μm thick polyethylene terephthalate film was bonded to a 50 μm thick aluminum foil. Except for the above, the same one as in Example 1 was used.

[0014]

As described above, according to the present invention,
It is possible to provide a planar antenna in which the ground conductor 1 is reduced in thickness and weight and the assembly process is simplified.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention.

FIG. 2 is an exploded perspective view showing another embodiment of the present invention.

FIG. 3 is a perspective view showing an embodiment of a fixture 2 according to one embodiment of the present invention.

FIG. 4 is a diagram showing characteristics of one embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a conventional example.

[Explanation of symbols]

 1. Ground conductor 2. Fixture 2a. Bottom part 2b. Side plate 2c. Fixing piece 4. Plating film 5a, 5b. Dielectric 6. Power supply board 7. Conductive plate 8. Radiating element 9. Feeding line 10. Slot 11. Screw 12. Slope 13. Waveguide

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kura Mizugaki, 1150 Goshomiya, Oaza, Shimodate, Ibaraki Prefecture Inside the Goshonomiya Plant of Hitachi Chemical Co., Ltd. (72) Kiichi Kanamaru, 1150 Goshomiya, Oaza, Shimodate, Ibaraki Hitachi Chemical Industry Co., Ltd.

Claims (4)

[Claims] A power supply board (6) formed with a ground conductor (1), a dielectric (5a), a plurality of radiating elements (8), and a power supply line (9) connected to the radiating elements (8). And a dielectric (5b) and a radiating element (8)
Conductor plate with multiple slots (10) formed at positions corresponding to
(7) are planar antennas stacked in this order, and as a fixture (2) for fixing these components, a bottom portion (2a) and two opposite sides of the bottom portion (2a). To the bottom (2
A fixture (2) having a side plate (2b) rising vertically from a) and a fixing piece (2c) protruding inward provided at an upper end of the side plate (2b).
A planar antenna comprising: 2. The planar antenna according to claim 1, wherein a plating film (4) is formed on the entire surface of the fixing tool (2), and also serves as a ground conductor (1). 3. The flat antenna according to claim 1, wherein the fixing piece has an inclined surface having an acute angle from a surface to be fixed toward an upper end of the side plate. . 4. The fixing device according to claim 1, wherein the fixing member is formed by insert-molding a waveguide for input and output on a bottom surface portion. A planar antenna as described in Crab.