JPH0661736A - Radial waveguide type planar antenna - Google Patents

Abstract

PURPOSE:To reduce the occupied height attended with antenna installation without reducing an antenna gain required by forming 1st and 2nd ground conductors in oval or rectangular. CONSTITUTION:The radial guide path type planar antenna is provided with a lower ground conductor 21 of an oval shape whose width is L and whose height is H and an upper ground conductor 22 of the same oval shape is arranged in parallel above the lower ground conductor 21 at a prescribed interval. The radial guide path 23 is formed between the lower ground conductor 21 and the upper ground conductor 22. A feeding lobe 25 is provided in the middle of the lower ground conductor 21 via an insulation terminal 24. Lots of element throughholes 26a, 26b, ... are concentrically provided on the upper ground conductor 22 and helical radiation elements 28a, 28b, ... are erected upright at the element throughholes 26a, 26b, ... via insulation sections 27a, 27b, ....

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to communication / satellite utilization.
The present invention relates to a radial waveguide type flat antenna used for broadcasting.

[0002]

2. Description of the Related Art FIG. 3 is a plan view showing the structure of a conventional radial waveguide type planar antenna. The conventional radial waveguide type planar antenna has a circular planar shape, and the circular ground on the upper part thereof is used. A large number of helical radiating elements 12a, 12b, ... Are erected concentrically on the conductor plate 11.

Below the circular ground conductor plate 11, a lower circular ground conductor plate (not shown) having the same outer diameter as that of the circular ground conductor plate 11 is arranged in parallel at regular intervals. In the lower circular ground conductor plate, power is fed in a feeding portion (not shown) provided at the center of the lower circular ground conductor plate. External radiation is generated by being coupled to the radiating elements 12a, 12b, .... Here, the antenna gain of the circular planar antenna becomes higher as the diameter D becomes larger.

[0004]

However, in the above-mentioned conventional radial waveguide type planar antenna, the occupied height at the antenna mounting position is required to be the height corresponding to the diameter D of the circular ground conductor plate 11 when used. Therefore, in particular, when it is used by being attached to the roof of a moving body such as a bus or a car that has a height limitation during traveling, it is not possible to use a plane antenna with a large diameter D, and the required antenna gain is obtained. However, there is a problem that communication becomes unstable.

The present invention has been made in view of the above-mentioned problems, and provides a radial waveguide type planar antenna capable of reducing the occupied height accompanying antenna installation without lowering the required antenna gain. The purpose is to do.

[0006]

That is, a radial waveguide type planar antenna according to the present invention is arranged in parallel with a first ground conductor having a feeding portion at its center. A radial waveguide is formed between the first ground conductor and a second ground conductor in which a large number of radiating elements are arranged, and the first ground conductor and the second ground conductor are arranged. It is configured as a shape or a rectangular shape.

[0007]

In other words, even if the same antenna gain as that of the conventional circular radial waveguide type planar antenna is obtained, the height occupied by the antenna can be significantly reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1A and 1B show the structure of a radial waveguide type planar antenna. FIG. 1A is a sectional view thereof, and FIG. 1B is a plan view thereof.

This radial waveguide type planar antenna is provided with a lower ground conductor 21 having a width L and a height H, and above the lower ground conductor 21, the upper portion having the same shape is formed at regular intervals. The ground conductors 22 are arranged in parallel. here,
A radial waveguide 23 is formed between the lower ground conductor 21 and the upper ground conductor 22. At the center of the lower ground conductor 21, the feeding probe 2 is provided via an insulating terminal 24.
5 are provided.

The upper ground conductor 22 is provided with a large number of element insertion holes 26a, 26b, ... Concentrically, and the element insertion holes 26a, 26b ,.
helical radiating elements 28a, 28 via a, 27b ,.
b, ... Are arranged upright.

Here, the lower ground conductor 21 having the above-mentioned amber shape.
When the radial waveguide type planar antenna is configured with the lateral width L of each of the upper ground conductor 22 and the upper ground conductor 22 of 350 mm and the height H of the upper ground conductor 22, the antenna gain in the 12 GHz band is 29.5.
dB can be obtained.

On the other hand, in the conventional circular radial waveguide type planar antenna shown in FIG. 3 above, in order to obtain the same antenna gain of 29.5 dB at 12 GHz, the circular ground conductor plates 11 in the upper and lower portions are used. It is necessary to make the diameter D of 260 mm.

That is, the antenna occupying area in the case of using the amber-shaped planar antenna in this embodiment is +90 mm in the lateral width L as compared with the antenna occupying area in the case of using the conventional circular planar antenna. 350-26
Although it is as large as 0), the height H is -100 mm (16
0-260).

That is, if the radial waveguide planar antenna in the shape of an amber is formed, the antenna occupying height H is significantly reduced even if the same antenna gain as that of the conventional circular radial waveguide planar antenna is obtained. can do.

Therefore, according to the radial waveguide type planar antenna having the above structure, the lower ground conductor 21 and the lower ground conductor 21 are arranged in parallel with each other, and the radial waveguide 23 is provided.
And a large number of helical radiating elements 28a, 28
By forming the upper ground conductors 22 in which b, ... Are arranged in the shape of an amber, the height H can be made significantly lower than that of a circular planar antenna in which the same antenna gain is obtained. It is possible to obtain a sufficient antenna gain and stabilize communication even when it is used by being mounted on the roof of a moving body such as a bus or a car whose height is restricted during traveling.

In the above-mentioned embodiment, the lower ground conductor 21 and the upper ground conductor 22 are formed in the amber shape. However, for example, a radial waveguide type using a rectangular ground conductor plate 31 as shown in FIG. Even if it is configured as a planar antenna, the height H can be reduced without lowering the antenna gain as in the above embodiment.

Further, the amber-shaped radial waveguide type planar antenna in the above-mentioned embodiment may be constructed by removing the upper and lower sides from the circular radial waveguide type planar antenna. Of course, the rectangular radial waveguide type planar antenna may be configured by removing the right side portion and the left side portion thereof.

[0018]

As described above, according to the present invention, between the first ground conductor having the feeding portion at the center and the first ground conductor arranged in parallel with the first ground conductor. And a second ground conductor on which a large number of radiating elements are arranged, and the first ground conductor and the second ground conductor are formed in an amber shape or a rectangular shape. As compared with the conventional circular radial waveguide type planar antenna, it is possible to reduce the occupied height accompanying installation of the antenna without lowering the required antenna gain.

[Brief description of drawings]

FIG. 1 is a sectional view and a plan view showing the configuration of a radial waveguide type planar antenna according to an embodiment of the present invention.

FIG. 2 is a plan view showing another embodiment of the radial waveguide type planar antenna.

FIG. 3 is a plan view showing a configuration of a conventional radial waveguide type planar antenna.

[Explanation of symbols]

21 ... Koban-shaped lower ground conductor, 22 ... Koban-shaped upper ground conductor, 23 ... Radial waveguide, 24 ... Insulating terminal, 25 ... Feeding probe, 26a, 26b, ... Element insertion hole, 27a,
27b, ... Insulating part, 28a, 28b, ... Helical radiating element.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroaki Imaizumi 1406 Hasunuma, Omiya City, Saitama Yagi Antenna Co., Ltd. Omiya Factory

Claims (1)

[Claims] 1. A radial waveguide is formed between a first ground conductor having a feeding portion provided at the center thereof and the first ground conductor arranged in parallel with the first ground conductor, and a large number of radial waveguides are formed. A radial waveguide planar antenna having a second ground conductor on which a radiating element is arranged, characterized in that the first ground conductor and the second ground conductor are configured in an amber shape or a rectangular shape. Waveguide planar antenna.