JPH0559930U - Circularly polarized plane antenna - Google Patents

Abstract

(57) [Abstract] [Purpose] A high-gain circularly polarized plane antenna is obtained by using a probe as an input / output terminal of a converter as a probe for power supply in a hollow disk-shaped waveguide. [Structure] Circular metal plate 1 on the back side of a hollow disk-shaped waveguide
The housing 16 accommodating the converter is arranged on the outer surface of 2,
A probe 18, which is projected from the housing 16 as an input / output terminal of this converter, is penetrated through the circular metal plate 12 in an insulating state and directly projected to the center of the hollow disk-shaped waveguide for power supply.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a circularly polarized planar antenna in which a probe for supplying power as an input / output terminal of a converter is directly projected from a housing housing a converter to the center of a hollow disk-shaped waveguide. ..

[0002]

[Prior Art]

 In recent years, as various communication and broadcasting systems using circularly polarized microwaves have been proposed, various circularly polarized antennas for transmitting and receiving these circularly polarized microwaves have been studied and proposed. There is. One of them is a circularly polarized plane antenna that uses a curl antenna element as a circularly polarized antenna element that radiates circularly polarized waves. Explaining this in a little more detail, a hollow disk-shaped waveguide as a waveguide distributor is formed by two circular metal plates that are arranged in parallel and separated by a predetermined distance, and the center of the waveguide is used for power supply. Place the probe. Then, a plurality of curl antenna elements are provided so as to protrude from one side of the circular metal plate while the shaft portion is insulated from the outside. The microwave received by the circularly polarized planar antenna is frequency-converted by the converter via the probe and transmitted to the receiver, and the signal from the transmitter is frequency-converted by the converter to form a hollow disk shape from the probe. Is applied to the waveguide and the curl antenna element is excited and radiated as microwave circularly polarized waves. In this type of conventional device, this converter is placed at an appropriate position outside the circularly polarized plane antenna, but the input and output signals of the converter are transmitted through an appropriate rectangular waveguide and are used for this transmission. The probe provided in the rectangular waveguide was excited, and the other end of the probe was arranged so as to project into the hollow disk-shaped waveguide, and the signal was transmitted in this waveguide.

[0003]

[Problems to be solved by the device]

 As described above, in the past, in order to transmit the input and output of the converter to the probe for power supply of the hollow disk-shaped waveguide through the appropriate rectangular waveguide for transmission, the electromagnetic mode conversion was performed. Each time the signal was attenuated, the gain of the entire device was lowered. Further, there is a problem that the structure is complicated only by using the rectangular waveguide for transmission and the weight becomes heavy accordingly. Furthermore, since the structure is complicated, there is a problem in that moisture or the like is likely to enter the hollow disk-shaped waveguide or the rectangular waveguide for transmission, and the frequency characteristics are likely to change due to dew condensation or the like.

The present invention has been made in view of the above circumstances, and converts the electromagnetic wave mode by using a probe as an input / output terminal of a converter as a probe for supplying power to a hollow disk-shaped waveguide. It is an object of the present invention to provide a circular polarization plane antenna in which the gain is increased by reducing the number of times.

[0005]

[Means for Solving the Problems]

 In order to achieve such an object, the circularly polarized plane antenna of the present invention forms a waveguide with two metal plates arranged in parallel with each other and separated by a predetermined distance. A plurality of circularly polarized antenna elements are projectingly provided on the metal plate by penetrating the shaft portion from the outside, and a probe for power supply is arranged at the center of the waveguide by penetrating the center of the other metal plate. In the installed circularly polarized plane antenna, a casing housing the converter is arranged on the outer surface of the other metal plate, and the probe as the input / output terminal of the converter is projected from the casing. The probe is arranged so as to penetrate through the other metal plate in the center in the waveguide in an insulating state.

Further, the case and the outer side of the other metal plate may be covered with one case member.

Further, it is possible to cover the probe in a watertight state with an insulating resin and configure the case in a watertight state.

[0008]

[Work]

 The housing containing the converter is placed on the outer surface of the metal plate that constitutes the waveguide, and the probe as the input / output terminal of the converter is directly projected from the housing to the center of the waveguide and penetrates it. Therefore, the conventional rectangular waveguide for transmission is not required, and the number of times the electromagnetic wave mode is converted can be reduced accordingly, and the signal for the conversion is not attenuated and high profit can be obtained.

Then, by covering the outside of the housing housing the converter and the metal plate on which the converter of the waveguide is arranged with one case member, moisture or the like can be applied to the joint surface between the housing and the metal plate. Water does not enter the inside of the waveguide through the hole formed in the metal plate for penetrating the probe.

Further, if the probe is covered with an insulating resin in a watertight state, even if moisture or the like enters the waveguide and dew on the inner wall, a short circuit may occur between the probe and the metal plate. Absent.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a vertical cross-sectional view of an embodiment of the circularly polarized planar antenna of the present invention, and FIG. 2 is a partially cutaway enlarged vertical cross-sectional view of the power supply probe of FIG.

In FIG. 1 and FIG. 2, two circular metal plates 10 and 12 are arranged in parallel at a predetermined distance to form a hollow disk-shaped waveguide as a waveguide distributor. The outer peripheral edge of the circular metal plate 12 on the back side is formed in a tubular shape and is in close contact with the back side of the circular metal plate 10 on the front side, and the tubular portion constitutes the short-circuit plate 14. A flat housing 16 accommodating the converter is provided on the outer back surface of the circular metal plate 12 on the back side, and the probe 18 protruding from the housing 16 serves as an input / output terminal of the converter. The plate 12 is penetrated through in an insulating state and is disposed for power supply in the central portion of a hollow disk-shaped waveguide. Further, a large number of holes are formed in the front circular metal plate 12, and insulators 20, 20, ... Made of an insulating resin are fixed to these holes. A plurality of curl antenna elements 22, 22 as circularly polarized antenna elements are inserted into these insulators 20, 20, ... It Further, the outer surfaces of the housing 16 and the circular metal plate 12 on the back side are covered with one case member 24 made of a resin material. Further, a radome 26 made of a resin material is arranged on the front surface of the front circular metal plate 10 so as to cover the curl antenna elements 22, 22 ... The radome 26 and the peripheral portion of the case member 24 are water-tightly joined and fixed by the molding 28. The connector 30 protruding from the housing 16 to the back side is configured to penetrate the case member 24 via the rubber bushing 32 so that the inside of the case member 24 is watertight.

Further, the probe 18 is protruded to the outside of the housing 16 from a microstrip line of a printed circuit board 34 or the like that forms a converter housed in the housing 16. The probe 18 is made of an insulating resin material. It is watertightly covered by the cap 36. A watertight state is formed between the cap 36 and the housing 16 by an O-ring 38.

In such a configuration, the probe 18 projecting from the housing 16 as the input / output terminal of the converter is directly hollow as a waveguide distributor without a transmission rectangular waveguide or the like being interposed in the middle. Since it is projected to the center of the disc-shaped waveguide for power supply, the number of times the electromagnetic wave mode is converted is small and a high gain is obtained accordingly. Moreover, the structure is simple and the weight can be reduced easily because a rectangular waveguide for transmission is not required.

Since the case 16 housing the converter and the outer side of the circular metal plate 12 on the back side are covered with one case member 24, moisture or the like enters the joint surface between the casing 16 and the circular metal plate 12. There is no risk of this, and water will not enter the waveguide through a hole or the like for penetrating the probe 18 formed in the circular metal plate 12. Furthermore, since the probe 18 is covered with the cap 36, even if dew condensation occurs in the hollow disk-shaped waveguide, an electrical short circuit does not occur between the probe 18 and the circular metal plate 12. Further, the cap 36 and the housing 16 are also formed in a watertight state by the O-ring 38, and there is no fear that the characteristics of the converter in the housing 16 will change due to intrusion of water or the like.

The circular metal plate 12 constituting one of the hollow disk-shaped waveguides is bent at its outer peripheral portion to form a short-circuit plate 14, but the short-circuit plate 14 is formed as a separate member. Is also good. Further, the circular metal plates 10 and 12 may be metal thin films formed on the surface of the resin by vapor deposition or plating. Further, the waveguide distributor is not limited to the circular shape, but may be a polygonal shape or a quadrangular shape, and the two metal plates forming this waveguide are not limited to the circular shape as in the above embodiment. Not a thing.

[0017]

[Effect of the device]

 As described above, since the circularly polarized plane antenna of the present invention is constructed, the following special effects are obtained.

In the circularly polarized planar antenna according to claim 1, the probe as an input / output terminal of the converter protruding from the housing supplies power to the central portion of the hollow disk-shaped waveguide. Since it is directly projected for use, a rectangular waveguide for transmission is omitted, and the number of electromagnetic wave mode conversions can be reduced accordingly, and a circularly polarized plane antenna with high gain can be obtained as a whole.

Further, in the circularly polarized plane antenna according to claim 2, the case housing the converter and the outside of the metal plate on the back side of the hollow disk-shaped waveguide are covered with one case member. Therefore, there is no risk that water will enter the joint surface between the converter and the metal plate, and water will not enter the hollow disc-shaped waveguide through the holes for penetrating the probe, so that dew condensation in this waveguide will occur. The frequency characteristic is stabilized without causing a change in the frequency characteristic.

Further, in the circularly polarized plane antenna according to the third aspect of the invention, the probe protruding into the hollow disk-shaped waveguide is covered with the cap of the insulating resin material, so that dew condensation occurs inside the waveguide. In the event of an occurrence, no electrical short circuit will occur between the probe and this waveguide.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of a circularly polarized plane antenna of the present invention.

2 is a partially cutaway enlarged vertical cross-sectional view of the power supply probe of FIG. 1. FIG.

[Explanation of symbols]

 10, 12 circular metal plate 16 housing 18 probe 20 insulator 22 curl antenna element 24 case member 36 cap

Front page continued (72) Creator Shigeru Yoshida 1112 Shinnohara, Tomioka City, Gunma Yokoo Co., Ltd. Inside the Tomioka Factory

Claims (3)

[Scope of utility model registration request] 1. Two units arranged in parallel at a predetermined distance.
A waveguide is formed by a number of metal plates, and a plurality of circularly polarized antenna elements are projectingly provided on one of the metal plates of the waveguide by penetrating the shaft portion from the outside, and In a circularly polarized plane antenna having a probe for power supply arranged in the center of the waveguide through the center, a case accommodating a converter is arranged on the outer surface of the other metal plate. The probe as an input / output terminal of the converter is projectingly provided, and the probe is arranged in the center of the waveguide so as to penetrate the other metal plate in an insulated state. Wave planar antenna. 2. The circularly polarized plane antenna according to claim 1, wherein the case and the outside of the other metal plate are covered with one case member. 3. The circularly polarized plane antenna according to claim 1 or 2, wherein the probe is covered with an insulating resin in a watertight state and the casing is formed in a watertight state. ..