Multiple beam satellite antenna with preferred polarization dist

Details Multiple beam satellite antenna with preferred polarization dist Multiple beam satellite antenna with preferred polarization dist

1978-11-24

1980-11-04

Lieberman, Eli

Communications: radio wave antennas

Antennas

Wave guide type

343779, 343DIG2, 343100PE, H01Q 128, H01Q 326

Patent

active

042323215

ABSTRACT:
Microwave energy feed elements for launching essentially linearly polarized beams in a satellite communications system are oriented in the satellite's antenna so that the polarization directions of the feed elements form a rim and spoke configuration. The vertical polarizations are arranged to extend radially from a point on the antenna's focal surface which images the point on the surface of the celestial body directly below the satellite. Horizontal polarizations are arranged concentrically about the subsatellite image point. Electromagnetic energy launched from the feed elements will reach the surface of the earth at planes of incidence which are locally vertical and horizontal, thereby minimizing cross-polarization coupling between the orthogonally polarized signals due to such energy passing through precipitation.

REFERENCES:
patent: 3747031 (1973-07-01), Ohm
patent: 3755760 (1973-08-01), Ohm
Kogelnik & Li, Laser Beams and Resonators; Applied Optics, vol. 5, No. 10, Oct. 1966, pp. 1550-1567.
Chu; Restoring The Orthogonality of Two Polarizations in Radio Communications; BSTJ, vol. 50, No. 9, Nov. 1971, pp. 3063-3069.
Chu et al., Quasi-Optical Polarization Diplexing of Microwaves, BSTJ, vol. 54, No. 10, Dec. 1975, pp. 1665-1680.

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