G - Physics – 01 – S
Patent
G - Physics
01
S
351/28
G01S 5/02 (2006.01) H01Q 3/20 (2006.01) H01Q 19/17 (2006.01) H01Q 25/00 (2006.01)
Patent
CA 1240389
- 13 - AN ADAPTIVE ANTENNA FOR REDUCING MULTIPATH FADES Abstract The present invention relates to an antenna arrangement for reducing multipath fades. The antenna arrangement comprises a curved main reflector disposed confocally with one focal point of a subreflector, and a feed arrangement. The feed arrangement comprises at least a pair of feed horns and a selectively movable plate reflector disposed between the feed horns and the subreflector along a feed axis of the antenna arrangement. The feed horns are disposed adjacent each other with the aperture of each of two feed horns covering one-half of the image of the main reflector. By selectively orienting the plate reflector so that one of the two multipath beams arrives with its central ray disposed orthogonal to the aperture of the feed horns, the contribution from each half of this beam received at each feed horn, for a particular frequency band, is equal and can be subtracted from the other half beam signal to cancel its effect without the need for an equalizer.
493735
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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