JP2579996Y2 - Circularly polarized planar antenna - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circularly polarized planar antenna having a plurality of circularly polarized antenna elements protruding from a single metal plate constituting a waveguide distributor. The present invention relates to a structure for easily disposing a circularly polarized antenna element in a predetermined direction.

[0002]

2. Description of the Related Art In recent years, with various proposals of communication and broadcasting systems using microwave circularly polarized waves, various studies have been made on circularly polarized antennas for transmitting and receiving these microwave circularly polarized waves. As well as being proposed. As one of them, there is a circularly polarized planar antenna using a curl antenna element as a circularly polarized antenna element for radiating circularly polarized waves. To explain this in more detail, a power distribution unit is arranged at the center of a hollow disk-shaped waveguide formed of two parallel, circular metal plates separated by a predetermined distance to constitute a waveguide distributor. A curl antenna element consisting of a shaft portion and a spiral curl portion of 1 to 1.5 turns connected to an end of the shaft portion via an arm portion is insulated from one outside by a circular metal plate. And a large number of projections are provided so as to constitute a circularly polarized planar antenna.

[0003]

By the way, in the above-mentioned circularly polarized planar antenna, the direction of the curl portion of the curl antenna element, that is, the direction around the axis perpendicular to the metal plate, is changed.
The phases of the circularly polarized waves radiated from all the curl antenna elements must be the same, depending on the arrangement positions on the metal plate. Therefore, it is desirable that the curl antenna element can be easily installed in a predetermined direction according to the arrangement position.

The present invention has been made in view of such circumstances, and a circularly polarized antenna element is provided by an insulator provided to project from a single metal plate constituting a waveguide distributor in an insulated state. It is an object of the present invention to provide a circularly polarized planar antenna in which a polarized antenna element can be easily determined in a direction corresponding to an arrangement position.

[0005]

In order to achieve the above object, the circularly polarized planar antenna according to the present invention has a plurality of holes formed in one metal plate constituting a waveguide distributor. An insulator made of an insulating material is disposed on each of the shaft portion and a spiral curl portion provided in a plane orthogonal to the shaft portion and connected to an end of the shaft portion via an arm portion. The circularly polarized antenna element is inserted into the insulator from the outside through the shaft portion to penetrate the metal plate in an insulated state, and the direction of the curl portion is set in a predetermined direction, and a plurality of projecting circles are provided. In the polarization plane antenna, a groove into which the arm portion can be inserted is formed on the outer end surface of the insulator, and the direction of the curl portion is determined by the direction of the groove.

[0006] A connecting portion formed integrally with the insulator and bridging at least two of the insulators may be provided.

[0007] Further, the metal plate in which a hole has been drilled in advance,
An insulator formed by outsert molding can also be provided.

[0008]

[Operation] A groove is provided on the outer end face of the insulator provided on the metal plate. When inserting the shaft of the circularly polarized antenna element into the insulator, the arm is inserted into the groove. The orientation of the circularly polarized antenna element with respect to the insulator is determined. Therefore, the circularly polarized antenna element can be easily arranged in a predetermined direction by disposing the insulator in the metal plate in a direction corresponding to the disposition position.

By providing a connecting portion for bridging at least two insulators, the insulator cannot rotate around the axis of the hole formed in the metal plate, and the direction of the groove provided in the insulator is shifted. There is no.

Further, by providing an insulator formed by outsert molding on a metal plate, the direction of a groove formed in the insulator by a molding die is determined.

[0011]

1 to 5 show an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is an exploded perspective view of a curled antenna element and an insulator constituting an embodiment of the circularly polarized planar antenna of the present invention. FIG. 2 is a longitudinal sectional view of the insulator shown in FIG. 2 is a plan view of FIG. 2, FIG. 4 is a side view of FIG. 2, and FIG. 5 is a partially cutaway perspective view of an embodiment of the circularly polarized planar antenna of the present invention.

In the figure, a hollow disk-shaped waveguide as a waveguide distributor is formed by two parallel circular metal plates 10 and 12 separated by a predetermined distance, and a power supply unit 14 is provided at the center thereof. Will be arranged. A large number of holes 16 are formed in one metal plate 10.

The insulators 18, 18... Are all formed in one step by outsert molding with an insulating resin material on the metal plate 10 in which the large number of holes 16, 16. The insulator 18 has enlarged portions 18a, 18a provided on both sides of the metal plate 10 to prevent the metal plate 10 from coming off. Further, a shaft insertion hole 18b is provided in the metal plate 10 in a vertical direction. Shaft insertion hole 18
b, and a groove 18c continuous with the shaft insertion hole 18b.
The inside diameter of the tip inside is slightly enlarged. Further, the connecting portion 20 is integrally formed with the insulators 18 by bridging the two insulators 18. Groove 1
The mold is configured so that the direction of 8c is appropriate in accordance with the arrangement position at the time of outsert molding.

A curl antenna element 22 as a circularly polarized antenna element penetratingly inserted into the insulator 18 is provided.
Is made of a conductive wire, and includes a shaft portion 22a and the shaft portion 22a.
And a spiral curl portion 22c connected to an end of the shaft portion 22a via an arm portion 22b that is bent in the horizontal direction. Further, the shaft 2
A part of the outer peripheral surface is crushed at an intermediate portion of
d is formed. Then, the shaft 22a is inserted through the shaft insertion hole 18b of the insulator 18, and the arm 22b is inserted into the groove 18c. By inserting the arm portion 22b into the groove 18c, the direction of the curl antenna element 22 is determined, and the projections 22d and 22d formed on the shaft portion 22a are formed.
22d is located at the enlarged portion of the inner diameter of the shaft insertion hole 18b to prevent slipping.

In such a configuration, the insulator 1
, 18 are bridged by the connecting portion 20 two by two and cannot rotate around the axis of the holes 16, 16. The insulators 18, 18 are provided with grooves 18c, 18c in a direction corresponding to the respective arrangement positions. Therefore, the arms 22 are provided in the grooves 18c, 18c.
are inserted through the insulators 18, 18 so that the curl antenna elements 22, 22 are arranged in a predetermined direction according to the arrangement position. Is done.

The two insulators 18, 18
Are integrally formed so as to be bridged by the connecting portion 20, and the hole 1 is formed.
Cannot rotate around the axis of 6,16 ... For this purpose, hole 1
6, 16... May be a perfect circle, the shape of a die or the like for perforation is simple, and it is easy to form a large number of holes 16, 16,.

It is needless to say that the number of the insulators 18, 18 integrally bridged by the connecting portion 20 may be three or more. Also, without using the connecting portion 20,
The holes 16, 16... Formed in the metal plate 10 are shaped such that the insulators 18, 18,..., Such as square, oval, and gourd-shaped, cannot rotate.
8, 18,... May be outsert molded. .. May be individually assembled into the holes 16, 16... Of the metal plate 10 without performing the outsert molding. In such a case, each of the insulators 18 has the same shape, and the metal plate 10 is provided with an insulator 18 such as a gourd-shaped insulator 18 such that the grooves 18c of the insulators 18 are oriented in accordance with the arrangement positions. , 18 ... can not be rotated.

Further, the waveguide distributor is not limited to a hollow disk-shaped waveguide as in the above embodiment, but may be a rectangular waveguide through which a microwave signal is propagated. Further, the circularly polarized antenna element is not limited to the curl antenna element 22, but may be an element having a shaft portion and an arm portion, and a curl portion having a spiral shape. Further, one of the metal plates 12 constituting the hollow disk-shaped waveguide is bent at the outer periphery to form a short-circuit plate, but this short-circuit plate may be formed of another member. Further, the metal plates 10 and 12 may be metal thin films formed on the surface of the resin by vapor deposition or plating.

[0019]

[Effects of the Invention] As described above, since the circularly polarized planar antenna of the present invention is constructed, the following special effects can be obtained.

In the circularly polarized planar antenna according to the first aspect, the direction of the circularly polarized antenna element is determined by inserting the arm into the groove when the circularly polarized antenna element is inserted through the insulator. . Therefore, the work of disposing a large number of circularly polarized antenna elements on the metal plate in different directions at the disposition positions becomes simple.

If at least two insulators are bridged by the connecting portion, the insulator itself cannot rotate around the axis of the hole. Therefore, the hole to be formed in the metal plate may be a perfect circle, the shape of the mold for forming the hole is simple and the cost is accordingly low, and the circularly polarized planar antenna of the present invention can be manufactured at low cost.

Further, if the insulator is outsert-molded on a metal plate, the direction of the groove of each insulator can be accurately formed by a molding die in accordance with the arrangement position, and the insulator is formed separately on the metal plate. The number of assembling steps is smaller than that to be assembled, which is suitable for mass production.

[Brief description of the drawings]

FIG. 1 is an exploded external perspective view of a curled antenna element and an insulator constituting an embodiment of a circularly polarized planar antenna of the present invention.

FIG. 2 is a longitudinal sectional view of the insulator shown in FIG.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a side view of FIG. 2;

FIG. 5 is a partially cutaway perspective view of one embodiment of the circularly polarized planar antenna of the present invention.

[Explanation of symbols]

 10, 12 metal plate 16 hole 18 insulator 18b shaft insertion hole 18c groove 20 connecting part 22 curl antenna element 22a shaft part 22b arm part 22c curl part

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) H01Q 21/24 H01Q 21/06 H01Q 11/08 H01Q 13/08

Claims (3)

(57) [Scope of request for utility model registration] 1. A plurality of holes are drilled in one metal plate constituting a waveguide distributor, and insulators made of an insulating material are respectively arranged in the holes, and a shaft portion and the shaft portion are orthogonal to each other. A circularly polarized antenna element comprising a spiral curl portion provided in one plane and connected to the tip of the shaft portion via an arm portion, the shaft portion is inserted through the insulator from the outside and inserted into the insulator. While penetrating the metal plate in an insulated state,
By setting the direction of the curl portion in a predetermined direction, in a circularly polarized planar antenna that is provided in a plurality of projections, a groove in which the arm portion can be inserted is formed on the outer end surface of the insulator,
A circularly polarized planar antenna, wherein the direction of the curl portion is determined by the direction of the groove. 2. The circularly polarized plane antenna according to claim 1, further comprising a connecting portion formed integrally with the insulator and bridging at least two of the insulators. antenna. 3. The circularly polarized planar antenna according to claim 1, wherein an insulator formed by outsert molding is provided on the metal plate in which a hole is formed in advance. .