JP2530187Y2 - Waveguide type planar antenna - Google Patents

Description

[Detailed description of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveguide type planar antenna used for satellite communication and the like.

[0002]

2. Description of the Related Art As a waveguide-type planar antenna used for satellite communication and the like, a radiation plate having a large number of radiation slots, a casing defining a waveguide space on the back side of the radiation plate, and a conductive plate. There has been proposed a waveguide-type planar antenna having a feeding unit provided in the center of a wave space and a converter connected to the feeding unit.

In such an antenna, a slow wave circuit member, a radiation plate, a filler for a radome layer, and the like are conventionally fixed between a casing and a cover covering the surface of the radiation plate.

[0004]

However, since such an antenna is mainly installed outdoors, if the above-mentioned members are eccentric with respect to the power supply means due to vibration, the electrical performance of the antenna is reduced. There was a problem. Therefore, it is conceivable that the members are bonded to each other with an adhesive over the entire surface. However, since the members have different thermal expansion coefficients, when each member thermally expands (shrinks) due to an external temperature change, it is particularly soft. In this case, a distortion such as warpage occurs in the slow-wave circuit member or the radiation plate made of a thin plate, and there is a problem that the electrical performance of the antenna is reduced as described above.

[0005] In view of the above-mentioned problems of the prior art, a main object of the present invention is to provide a waveguide-type planar antenna whose electrical performance is not reduced by vibration or temperature change.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a radiation plate having a substantially circular planar shape and a large number of radiation slots, and a waveguide space formed on the back side of the radiation plate. A casing to be defined, and a slow-wave circuit member made of a dielectric filled to form a slow-wave circuit in the waveguide space.
A waveguide-type planar antenna further provided with feeding means in the waveguide space , wherein the casing, the slow wave circuit member, and the radiation plate are viewed in a plane.
A waveguide-type planar antenna characterized in that they are bonded to each other only in the vicinity of a central portion surrounding the feeding means.
A radiating plate having a substantially circular planar shape and having a number of radiating slots, a casing defining a waveguide space on the back side of the radiating plate, and provided in the waveguide space in parallel with the radiating plate, And an intermediate plate that divides the waveguide space into two in the axial direction while leaving a gap in the circumferential direction between the casing and the inner wall of the casing.
Has a slow wave circuit member made of filled dielectric to constitute a slow-wave circuit on one of the divided waveguide space, and a spacer which is filled in the other divided waveguide space, further fractionated
Feeding means to the space on the casing side of the split waveguide space
Is provided , the feed power is a waveguide planar antenna radiated from the radiation plate through the divided waveguide space from the feed means, the casing, the slow wave circuit member, and the radiation plate, the look for the plane
This is attained by providing a waveguide type planar antenna characterized in that it is adhered to each other only in the vicinity of a central portion surrounding the feeding means .

[0007]

As described above, in a waveguide type planar antenna in which the waveguide space is not divided in the axial direction, the casing, the slow wave circuit member filled in the waveguide space, and the radiation plate are formed.
In a waveguide type planar antenna in which the waveguide space is divided into two parts in the axial direction only in the vicinity of the center of each plane, the casing and one of the divided waveguide spaces are filled. Spacers, an intermediate plate for dividing the waveguide space, a slow wave circuit member filled in the other of the divided waveguide spaces, and a radiation plate only in the vicinity of the center of each plane. If they are adhered to each other, the members do not shift due to vibration. In addition, since portions other than the central portion where the members are bonded can expand and contract relatively freely in the casing, the members do not warp or deform due to temperature changes.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 show a configuration of a first embodiment of a waveguide type planar antenna to which the present invention is applied.
The waveguide-type planar antenna body 1 has a substantially disk shape,
The converter 2 is provided on the back side via a holder 3. On the back side of the main body 1, there is provided a bracket 4 composed of a movable part 5 fixed to the main body and a fixed part 6 pivotally attached to the movable part with a pivotal support 7. At a position separated from the pivotal support 7 between the movable part 5 and the fixed part 6, an angle adjusting part 8 including a slot and a pin for adjusting the tilt angle of the main body 1 in the front and rear directions is provided. .

The fixed portion 6 has a cylindrical fitting portion 6a, and the waveguide flat antenna is fixed by fitting a pipe 10 fixed to the ground (not shown) into the fitting portion. The Rukoto.

As shown in FIGS. 2 and 3, the waveguide-type planar antenna main body 1 is fixed to a pipe 10 via the bracket 4 and has a substantially basin-shaped aluminum casing 11. , Copolymer of acrylonitrile rubber, special ethylene rubber and styrene (AES resin)
And an upper cover 12 which resiliently engages with the casing 11. Here, the surface of the casing 11 is anodized.

An outer peripheral portion of the casing 11 is bent toward the cover 12, and an engaging portion 11a is formed over the entire periphery so that an intermediate portion bulges outward so as to form a substantially U-shaped cross section. Have been. On the other hand, the upper cover 12 has a generally tray-like shape, and its peripheral edge is bent toward the casing 11 and is curved so as to form a U-shaped cross section along the shape of the peripheral edge 11a over the entire circumference. A corresponding engagement portion 12a is formed. A first seal 13a filled with a liquid sealing material made of silicon RTV rubber is provided between the engaging portion 11a and the corresponding engaging portion 12a. The edge 12b of the corresponding engaging portion 12a has a slightly enlarged diameter, and the portion formed between the enlarged edge 12b and the engaging portion 11a has the same liquid sealing material as described above. Is provided with a second seal 13b.

The outer peripheral surfaces of the engaging portions 11a and 12a
An outer peripheral ring 14 made of non-migrating soft vinyl chloride is attached over the entire circumference. One end of the outer peripheral ring 14 is adhered to the engaging portion 12a and / or the corresponding engaging portion 12a by the liquid sealing material 13b. Also,
It is conceivable that an empty room is formed between the expanded portion 12b of the corresponding engaging portion 12a and the outer peripheral ring 14, but a drain hole 14a is formed in a portion serving as a lower end of the outer peripheral ring 14. Therefore, water does not accumulate in this empty room.

The space defined by the casing 11 and the upper cover 12 is divided by a radiation plate 15 into an upper waveguide space 16 and a lower waveguide space 17. The upper waveguide space 16 is filled with a radome layer 20 made of a highly expanded polystyrene resin. In the lower waveguide space 17,
A slow-wave circuit member 18 also serving as a spacer made of any of a foamed polyethylene resin, a foamed polystyrene resin, and a foamed polypropylene resin is filled. Here, in the present embodiment, the casing 11, the slow wave circuit member 18, and the radiation plate 1
5 is made of a hot melt adhesive to form an annular ring near the power feeding element 9
They are respectively bonded only at the central bonding portions 19 (FIG. 3).
Therefore, the casing 11, the slow wave circuit member 18, and the radiation plate 1
5 is adhered over the entire surface, the shape of each member is distorted when the temperature changes, and the eccentricity of each member is caused by the fact that the casing 11, the slow wave circuit member 18, and the radiation plate 15 are not adhered. Don't worry.

In order to assemble the waveguide type planar antenna as described above, first, the casing 11 is provided with the slow wave circuit member 1.
8 and the radiation plate 15 are bonded by a hot melt adhesive,
After mounting the radome layer 20, the cover 12 in which the liquid sealing material 13a is applied to the inner surface of the corresponding engaging portion 12a is fitted into the casing 11, and the engaging portion 11a and the corresponding engaging portion 12a are resiliently engaged. At this time, the presence of the expanding portion 12b makes it easy to engage both engaging portions with each other.

Next, the converter 2 is mounted on the casing 11 via the holder 3. Then, a liquid sealing material is applied between the expanding portion 12b and the engaging portion 11a, and before the liquid sealing material dries, the outer peripheral ring 14 is bonded to the edge of the outer ring 14 with the liquid sealing material. And drain hole 14
It is attached to the outer periphery of both engaging portions 11a and 12a such that a is the lower end.

Then, the main body 1 assembled in the above-described procedure is assembled to the pipe 10 via the bracket 4.

FIG. 4 is a view similar to FIG. 3 showing a second embodiment to which the present invention is applied. Parts similar to those of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be made. Is omitted.

In this embodiment, the waveguide space 27 is formed by an intermediate plate 28.
As a result, the waveguide space 27 is separated from the first divided space 27a and the second divided space 27 on the radiation plate 15 side by leaving the gap formed by the peripheral portion of the casing 11 bulging outward.
b.

An axial spacer 29 made of, for example, a 10-fold expanded polystyrene resin is provided in the second divided space 27b.
Is filled. The first divided space 27a has a slow-wave circuit member 30 made of any of foamed polyethylene resin, foamed polystyrene resin and foamed polypropylene resin.
Is filled.

The power is radiated from the radiation plate 15 to the outside from the power supply element 9 through the second divided space 27b, the peripheral space of the casing 11, and the second divided space 27b.

In this embodiment, the casing 11, the slow-wave circuit member 30, the intermediate plate 28, the spacer 29, and the radiation plate 15 are adhered to each other only by the hot center melt adhesive at the annular central adhesive portion 31 near the feed element 9. ing. Other configurations are the same as in the first embodiment.

[0022]

As is apparent from the above description, the casing, the slow-wave circuit member, and the radiation plate are provided on each plane.
If the members are adhered to each other only in the vicinity of the central part, the members do not shift due to vibration, and the parts other than the central part where the members are adhered can expand and contract relatively freely in the casing. Therefore, distortion of the shape such as warpage does not occur in each member due to temperature change. Therefore, the electrical performance of the antenna can be prevented from deteriorating, and the life thereof can be extended.

[Brief description of the drawings]

FIG. 1 is a partial sectional side view showing a first embodiment of a waveguide type planar antenna according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an enlarged sectional view of a main part of FIG.

FIG. 4 is a view similar to FIG. 3 showing a second embodiment of the waveguide type planar antenna according to the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waveguide planar antenna main body 2 Converter 3 Holder 4 Bracket 5 Movable part 6 Fixed part 6a Fitting part 7 Pivot part 8 Angle adjustment part 9 Feeding element 10 Pipe 11 Casing 11a Engaging part 12 Upper cover 12a Corresponding engaging part 12b Edge 13a, 13b Liquid sealing material 14 Outer ring 14a Drain hole 15 Radiating plate 16 Guided space 17 Guided space 18 Slow wave circuit member 19 Central bonding portion 20 Radome layer 27 Guided space 27a First divided space 27b Second divided space 28 Intermediate plate 29 Spacer 30 Slow wave circuit member 31 Central bonding portion

Claims (3)

(57) [Scope of request for utility model registration] A radiation plate having a plurality of radiation slots, a casing defining a waveguide space on the back side of the radiation plate, and a slow wave circuit in the waveguide space. A slow-wave circuit member made of a dielectric filled to constitute
Has, a further waveguide-type planar antenna feed means is provided on the waveguide space, and said casing, said a slow wave circuit member and said radiating plate, said feeding look at the plane Center surrounding means
A waveguide type planar antenna characterized in that it is bonded to each other only in the vicinity of a portion . 2. A radiation plate having a substantially circular shape in plan view and having a large number of radiation slots, a casing defining a waveguide space on the back side of the radiation plate, and the radiation plate in the waveguide space. An intermediate plate that is provided in parallel and divides the waveguide space into two in the axial direction while leaving a gap in the circumferential direction between the casing inner wall and a slow wave circuit in one of the divided waveguide spaces. A slow-wave circuit member made of a dielectric material filled in,
Yes and spacers filled in the other of the divided waveguide space
And the space on the casing side of the divided waveguide space
A waveguide type planar antenna in which a power supply unit is provided between the power supply unit and the power supply unit, and the power supply unit is radiated from the radiation plate via the divided waveguide space, wherein the casing and the slow wave circuit are provided. A member and the radiating plate are arranged at a center which surrounds the feeding means when viewed in a plane thereof.
A waveguide type planar antenna characterized in that it is bonded to each other only in the vicinity of a portion . 3. The waveguide type planar antenna according to claim 1, wherein each of said members is made of a hot melt adhesive.