JPH0697720A - Antenna device - Google Patents

Abstract

PURPOSE:To dispense with a rotary joint and to simplify the mechanism of a mobile object satellite communication antenna together with its cost reduction by generating electrically a beam within a horizontal surface and then scanning the beam. CONSTITUTION:A rotary dielectric plate 1 is hollowed out along a boundary 5 on an antenna support board 6, and a feeder patch antenna 3 of a fixed type is provided at the center of the plate 1. Then the power is supplied to the antenna 3 to generate a circular polarized wave at the bottom part of the antenna 3. At the same time, the waveguide antennas 2 and a reflector antenna 4 are provided at both sides of the antenna 3. Thus a Yagi array is constructed and the maximum direction of the beam is tilted toward a waveguide 2 within a wave angle surface. The beam is rotated around an axis Z in response to the rotation of the plate 1 in order to track a satellite. In such a constitution, the antenna beam can be scanned within a horizontal surface with no use of a rotary joint. Thus an inexpensive antenna system is obtained in a simple structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device for tracking a mobile satellite.

[0002]

2. Description of the Related Art Conventionally, a high gain mobile antenna required for voice communication or the like used in mobile satellite communication supplies a radiating element 10 and an electromagnetic wave to the radiating element as shown in FIG. It is composed of a power supply line 11, a rotary joint 12 having a coaxial center, and a support plate 6. Here, as the radiating element 10, an antenna is proposed in which an antenna having a beam width wide in the elevation direction and a narrow beam width in the horizontal direction is rotated in a horizontal plane to track a satellite. In this antenna, since the feed line 11 rotates together with the antenna, the coaxial rotary joint 12 that allows electromagnetic waves to pass through the center of the antenna system is used.
Is equipped with.

[0003]

Since this conventional antenna device has an antenna system structure in which a rotary joint is provided in the central portion of the antenna for rotation, the mechanism is complicated and expensive.

An object of the present invention is to provide an antenna system capable of electrically scanning an antenna beam in a horizontal plane without rotating a power feeding section and using a rotary joint.

[0005]

An antenna device of the present invention is a patch antenna fixed to an antenna device support and supplied with a circularly polarized wave generation signal, and a parasitic director for forming an array with the patch antenna. And a reflector patch antenna, and a dielectric plate to which the parasitic waveguide and reflector patch antennas are attached. The dielectric plate rotates around the patch antenna in a horizontal plane.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.
1 is a configuration diagram of a first embodiment of the present invention, and FIG. 2 is an explanatory diagram of an antenna beam of the present embodiment. The embodiment of FIG. 1 has a fixed type feeding patch antenna 3 and a rotating dielectric plate 1 on an antenna device support 6. The rotating dielectric plate 1 has a donut-shaped dielectric plate 1 that is hollowed out at a boundary 5.
The parasitic patch antenna 2 for the waveguide and the patch antenna 4 for the reflector formed on the above are configured. In addition, the outer dielectric plate 1 can rotate. The feeding patch antenna 3 is fed from the bottom of the antenna device so that circularly polarized waves are generated. In the case of the fed patch antenna 3 alone which generates circularly polarized waves, a pattern having the maximum level in the zenith direction is formed like the pattern 7 in FIG. 2, but a parasitic director and a reflector are added around it. Then, when the Yagi array is constructed, the maximum direction of the beam can be tilted in the direction of the director in the elevation plane like the beam 8 in FIG. Therefore, when the feeding patch of the feeding patch antenna 3 is fixed and the dielectric plate 1 is rotated, the director and reflector patch antennas 2 and 4 formed on the dielectric plate 1 also rotate, and the beam also moves in Z direction. It will rotate around the axis and follow the satellite direction.

Next, a second embodiment of the present invention will be described with reference to FIG. In the embodiment shown in FIG. 3, a fixed dielectric plate 9 is provided on the antenna device support, and the feeder patch antenna 3 is fixed in the center of the dielectric plate 9. Further, it has a rotating dielectric plate 1A on the upper surface of the dielectric plate 9 and rotates on the Z axis.
This rotating dielectric plate 1A is provided with a parasitic patch 2 at a predetermined distance from the center. In this second embodiment, by rotating the dielectric plate 1A, the beam rotates around the Z-axis and follows the satellite direction, similarly to the beam 8 in FIG.

[0008]

As described above, the antenna device of the present invention forms a fed patch antenna for generating circularly polarized waves placed in the center, and a parasitic patch antenna for directors and reflectors that rotates around it. The antenna beam can be scanned in the horizontal plane without a rotary joint, which is required in the conventional antenna device, and a structurally simple and inexpensive antenna system can be constructed. In addition, since the radiating element to be scanned does not have a mechanically rotating portion, there is an effect that it is extremely advantageous in terms of reliability of the antenna device.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of characteristics of the first embodiment.

FIG. 3 is a configuration diagram of a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional antenna device.

[Explanation of Codes] 1,1A Rotating Dielectric Plate 2 Patch Antenna for Waveguide 3 Patch Patch Antenna for Feeder 4 Patch Antenna for Reflector 5 Boundary 6 Antenna Device Support 7 Pattern for Feeding Patch Only 8 Shaped Beam by Other Parasitic Patches 9 Fixed Dielectric Plate 10 Radiating Element

Claims (2)

[Claims] 1. A patch antenna fixed to an antenna device support and fed with a circularly polarized wave generation signal, a patch antenna for a parasitic director and a reflector which form an array with the patch antenna, and the parasitic waveguide. And a dielectric plate having patch antennas for reflectors attached thereto, the dielectric plate rotating around the patch antenna in a horizontal plane around the patch antenna. 2. A first dielectric plate supported by an antenna device support, a patch antenna fixed to the center of the first dielectric plate and supplied with a circularly polarized wave generation signal, and this patch. The antenna includes an antenna and an arrayed patch antenna for a reflector and a reflector, and a second dielectric plate on which the parasitic antenna for a waveguide and the patch antenna for a reflector are attached. An antenna device, which rotates in a horizontal plane about a central axis of a first dielectric plate.