Communications: radio wave antennas – Antennas – With means for moving directive antenna for scanning,...
Patent
1984-10-25
1986-08-19
Lieberman, Eli
Communications: radio wave antennas
Antennas
With means for moving directive antenna for scanning,...
343421, 343781P, 343778, H10Q 302, G01S 502
Patent
active
046072594
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.
REFERENCES:
patent: 3378844 (1968-04-01), Zurcher
patent: 4197542 (1980-04-01), Hofgen
patent: 4257048 (1981-03-01), Yokoi et al.
patent: 4425566 (1984-01-01), Dragone
Electronic Letters, vol. 7, No. 13, Jul. 1, 1971, Parsons et al., pp. 380-381.
IEEE International Radar Conf., Apr. 21-23, 1975, Arlington, Va., Nessmith et al., pp. 354-359.
Microwave Jrnl., vol. 19, No. 6, Jun. 1976, Willwerth et al., pp. 37-39.
Radar-82, Oct. 18-20, 1982, London, Great Britain, Muto et al., pp. 225-229.
AT&T Bell Laboratories
Lieberman Eli
Pfeifle Erwin W.
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