JP2522094Y2 - Offset antenna device - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] This invention is applied to microwave lines,
The present invention relates to an improvement of an offset antenna device used for satellite communication.

[0002]

2. Description of the Related Art FIG. 2 is a schematic structural view showing a conventional offset antenna device, in which 1 is a parabolic main reflecting mirror, 2 is a sub-reflecting mirror, 3 is a primary radiator, 4 is a supporting portion, Reference numeral 5 denotes an antenna mount, and 6 denotes a power supply unit.

Next, the operation will be described. For example, a radio wave radiated from a satellite is reflected by a main reflecting mirror 1 having a paraboloid, further reflected by a sub-reflecting mirror 2, and converged on a primary radiator 3. The radio wave converged on the primary radiator 3 is subjected to transmission processing in, for example, a power supply unit 6 provided with a receiving device. The above is the functional operation when the offset antenna device is used in the receiving system, but when considered as a transmitting system, the radio wave transmitted by the power supply unit 6 composed of the transmitting device and the transmitting device is transmitted to the receiving path. Is radiated to the front surface of the opening of the main reflecting mirror 1 by following the reverse path. The support part 4 is a structural member that mechanically holds the primary radiator 3 and the power feeder 6.

The function of adjusting the direction of the offset antenna apparatus toward the satellite and the function of supporting the entire mirror surface including the main reflecting mirror 1 are performed by the antenna mount 5, and are composed of direction adjusting screws and fixing fasteners. ing.

[0005]

The conventional offset antenna device is constructed as described above and has a simple structure and good radiation characteristics. However, on the central axis of the primary radiator, the primary radiator and There is a limit to the main reflector and it cannot be mounted depending on the structure of the feeder mounted on the primary radiator.If necessary, the structure of the feeder should be shaped to avoid the lower part of the main reflector. However, there is a problem that the configuration of the power supply unit is complicated and expensive, for example, the mounting is forced.

The present invention has been made to solve the above-mentioned problems, and has as its object to provide an antenna device in which a feeder having a predetermined size can be easily connected to a primary radiator and mounted. I do.

[0007]

An offset antenna device according to the present invention is obtained by removing a part of a lower portion of a main reflector in a predetermined area.

[0008]

According to the present invention, the offset antenna device is
Since a part of the lower part of the main reflecting mirror is omitted in a predetermined area, connection with the primary radiator and mounting can be easily performed without being greatly restricted in the configuration or structure of the power supply unit.

[0009]

[Embodiment 1] FIG. 1 is a schematic view showing an embodiment of the present invention. FIG.
In the figure, reference numeral 7 denotes a main reflecting mirror in which a part of the lower part of the mirror surface is omitted, and 2, 3, 4, and 5 are completely the same as conventional ones. 8
Is a power supply unit with a built-in transceiver, and 9 is a missing part of the main reflector.

The functional operation of each part of the offset antenna device configured as described above is exactly the same as that of the conventional one, and the path of the radio wave when used for the receiving system or the radio wave when used for the transmitting system is used. The route is exactly the same as before. However, the feeder 8 having a large structure, which cannot be mounted with the conventional antenna device, can be mounted by being connected to the primary radiator 3, so that the application and function are improved.

[0011] Furthermore, if the shape of the cut-out portion of the lower part of the main reflecting mirror is set to, for example, an antenna device having an opening diameter of the main reflecting mirror of 1800 mm, a half-moon shape having a radius of approximately 200 mm is obtained. Without deteriorating the radiation characteristics of the device.

Further, the strength of the antenna device does not deteriorate due to the addition of a small reinforcing material to the rear surface of the lower part of the mirror surface which has been removed.

[0013]

As described above, according to the present invention, a part of the lower part of the main reflecting mirror is omitted in a predetermined area.
There is an effect that the size restriction on the feeder structure can be reduced, the antenna can be easily connected to and mounted on the primary radiator, and an antenna device that is economically inexpensive and has expanded functions can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic structural view showing an offset antenna device according to an embodiment of the present invention.

FIG. 2 is a schematic structural diagram showing a conventional offset antenna device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 main reflecting mirror 2 sub-reflecting mirror 3 primary radiator 4 support unit 5 antenna mount 6 power supply unit 7 main reflector 8 power supply unit 9 missing part of main reflector

Claims (1)

(57) [Scope of request for utility model registration] 1. A primary radiator, a main reflector consisting of a paraboloid, a phase center of the primary radiator as one focal point, and a focal point of the main reflector as another focal point. An offset antenna device comprising a sub-reflector having an elliptical surface, wherein a part of a lower portion of the main reflector is omitted in a predetermined region.