JPH089930Y2 - Parabolic antenna device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a parabolic antenna device for receiving microwaves such as broadcasting satellites and communication satellites.

[Conventional technology]

As shown in FIG. 4, a conventional parabolic antenna device for receiving microwaves is formed of aluminum or the like into a circular shape or an elliptical shape, and is attached to a support 71 via a mounting bracket 72 and a feed horn 81. And a converter 8 which is attached to the reflector 7 via an arm 9 and which introduces the microwave reflected by the reflector 7 and converts the microwave into an intermediate frequency signal. By the way, circularly polarized waves are used for microwaves used for satellite broadcasting, and linearly polarized waves are used for microwaves used for satellite communication.

For this reason, when receiving both, it was necessary to install a plurality of expensive and bulky parabolic antenna devices each provided with a dedicated converter.

[Problems to be solved by the device]

It is an object of the present invention to solve the above-mentioned conventional drawbacks and to provide a parabolic antenna device which does not occupy a space, is inexpensive, and can easily receive satellite broadcasting and satellite communication.

[Means for solving the problem]

In order to solve the above problems, the present invention provides a reflector of a parabolic antenna that receives and reflects microwaves, a circular-linear converter corresponding to circularly polarized waves of the microwaves, and a rear end of the circular-linear converter. A first feed horn composed of a first rectangular waveguide adjacent to the first portion, and a second converging device corresponding to linearly polarized waves of the microwave and a second projecting inward end of the converging device. A second feed horn composed of a rectangular waveguide, a third rectangular waveguide that connects the first rectangular waveguide and the second rectangular waveguide, and an input terminal. At the same time, the tip of the same input terminal is inside any of the first rectangular waveguide to the third rectangular waveguide and passes through the first feed horn or the second feed horn. A converter that captures waves and converts them into intermediate frequency signals To constitute a parabolic antenna device.

[Action]

According to the above configuration, the reflector receives the microwave from the satellite, and the first feed horn or the second feed horn.
Reflect toward the feed horn.

The first feed horn introduces the microwave reflected by the reflector from the primary radiator, converts the circular polarized wave into the linear polarized wave by the circular-linear converter in the circular waveguide, and converts it into the first rectangular waveguide. To transmit. The second feed horn introduces the microwave reflected by the reflector from the primary radiator,
The converging device in the circular waveguide is rotated to two positions, horizontal or vertical, by the rotating means to selectively converge either horizontal or vertical linearly polarized waves of the microwaves, and the rear end of the converging device. The part is transmitted to a second rectangular waveguide projecting inward. The third rectangular waveguide connects the first rectangular waveguide and the second rectangular waveguide. In the converter, the tip of the input terminal protruding from the one end is disposed inside any of the first to third rectangular waveguides, and the first feed horn or the second feed horn is provided. The microwave passing through the horn is taken in and converted into an intermediate frequency signal in the converter circuit.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, 1 is a parabolic antenna reflector that receives and reflects 12 GHz band microwaves that are circularly polarized and linearly polarized, and 2 is the reflector 1.
A first feed horn for introducing a circularly polarized wave reflected by the reflector 1 and converting the circularly polarized wave into a linearly polarized wave, and a second feed horn 3 for introducing a vertical or horizontal linearly polarized wave reflected by the reflector 1. Reference numeral 5 is a converter for converting the microwave introduced through the first feed horn 2 and the second feed horn 3 into an intermediate frequency signal, and 6 is interposed between the reflector 1 and the support 61, It is an actuator for rotating the reflector 1.

The reflector 1 is formed in a circular shape or an elliptical shape with a hard aluminum material or FRP, and the actuator 6 is provided with a mounting bracket 12 having an angle adjustment means 11 at the center of the back surface.
Are bound to. An arm 13 extends from the mounting bracket 12 to the front surface of the reflector 1, and a tip portion 14 of the arm 13 supports the converter 5. Next, as shown in FIG. 3, the first feed horn 2 includes a metallic circular waveguide 21 having a primary radiator 22 at one end, and the circular circular waveguide 21.
A circular-linear converter 23 for converting the circularly polarized wave into a linearly polarized wave, which is installed in 21 and is adjacent to the rear end of the circular-linear converter 23 and has one end communicated with the circular waveguide 21. The first rectangular waveguide 24 is connected to one end of the converter 5. The other end opening of the first rectangular waveguide 24 is connected to one end of the converter 5. Reference numeral 25 is a resistance sheet for improving cross polarization characteristics.

The second feed horn 3 has a primary radiator at one end.
A circular waveguide 31 made of metal provided with 32, a second rectangular waveguide 33 adjacent to the circular waveguide 31, and a front end 35 inside the circular waveguide 31 and the microwave And the rear end
Is connected to the converging device 34 protruding into the second rectangular waveguide 33 and the rear end portion 36 via a joint 37 made of synthetic resin to selectively receive the vertical or horizontal polarized wave. To rotate the front end 35 into two vertical or horizontal positions for
It is composed of and. The first rectangular waveguide 24 and the second rectangular waveguide 33 are in communication with each other via the third rectangular waveguide 4. In the converter 5, one end of the input terminal 51 for taking in the microwave is formed to project, and the same end is connected to the opening of the first rectangular waveguide 24 and taken in from the input terminal 51. A converter circuit 52 for converting a microwave signal into an intermediate frequency signal is provided inside. The converter circuit 52 includes a high frequency amplification circuit section, a mixing circuit section, a local oscillation circuit section, an intermediate frequency amplification circuit section, and the like. Reference numeral 53 is an output terminal for the BS-IF signal transmitted from the converter circuit 52.

[Effect of device]

As described above, according to the present invention, a single parabolic antenna device can be used for both satellite broadcasting using circular polarization and satellite communication using linear polarization. The space and cost for installing the antenna device can be saved.

[Brief description of drawings]

FIG. 1 is a plan view showing an outline of a parabolic antenna device of the present invention, FIG. 2 is a side view of the same, FIG. 3 is an enlarged view of a partial sectional main part of FIG. 1, and FIG. 4 is a side view showing a conventional example. It is a figure. 1 ... Reflector, 2 ... First feed horn, 3 ...
... second feed horn, 4 ... third rectangular waveguide, 5
...... Converter, 23 ...... Circle-to-linear converter, 24 ...... First rectangular waveguide, 33 ...... Second rectangular waveguide, 34 ...... Concentrator,
51 …… Input terminal.

Claims (1)

[Scope of utility model registration request] 1. A reflector of a parabolic antenna for receiving and reflecting microwaves, a circle-linear converter corresponding to circularly polarized waves of the microwave, and a circle-linear converter adjacent to the rear end of the circle-linear converter. A first feed horn composed of one rectangular waveguide and a second rectangular waveguide in which a rear end of the converging device corresponding to the linearly polarized wave of the microwave and a rear end of the converging device project inward. And a second feed horn including a second feed horn, a third rectangular waveguide that connects the first rectangular waveguide and the second rectangular waveguide, and an input terminal. An intermediate frequency signal in which the microwave is taken through the first feed horn or the second feed horn and has a tip inside any of the first rectangular waveguide to the third rectangular waveguide. Parabolic antenna device consisting of a converter for converting to.