Multibeam communications satellite

Details Multibeam communications satellite Multibeam communications satellite

1978-04-20

1980-05-06

Lieberman, Eli

Communications: radio wave antennas

Antennas

Antenna with parasitic reflector

343100ST, 343DIG2, H01Q 128

Patent

active

042019923

ABSTRACT:
A multibeam communications satellite uses a dish-shaped reflector whose surface is a surface of revolution generated by rotating a plane parabola about an axis of revolution located in the plane of the parabola but angularly displaced from the axis of symmetry thereof. The line of revolution of the focal point of the parabola defines a focal circle, and a feed located on the focal circle will illuminate an area lying on a circle near the edge of the earth's apparent disc. Since every plane in which the axis of revolution lies is a plane of symmetry, the antenna exhibits good cross polarization cancellation, making the satellite particularly useful in frequency reuse communications systems.

REFERENCES:
patent: 3922682 (1975-11-01), Hyde

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