Communications: radio wave antennas – Antennas – Wave guide type
Patent
1984-11-16
1986-12-23
Lieberman, Eli
Communications: radio wave antennas
Antennas
Wave guide type
343781P, H01Q 1912
Patent
active
046315454
ABSTRACT:
The present invention relates to an antenna arrangement for correcting for astigmatism is a beam which is linearly scannable in a first principal plane of the antenna arrangement. The antenna arrangement comprises a parabolic or torus main reflector and a feed arrangement for producing first and second astigmatic phase centers which lie along first and second focal lines, respectively, in the first principal plane and match first and second astigmatic phase centers required by the main reflector to produce a linearly scannable plane wave. The feed arrangement comprises a reflector which is parabolic in the first principal plane and cylindrical in the second principal plane and is disposed both (1) confocally with the main reflector to produce an image of the main reflector, and (2) relative to the main reflector to produce the matching first and second astigmatic phase centers; a phased array with its aperture disposed to cover a predetermined portion of the main reflector image; and a pair of waveguide plates disposed parallel to the first principal plane and covering the area between the phased array, the reflector, and the first focal line.
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AT&T Bell Laboratories
Lieberman Eli
Pfeifle Erwin W.
Wimer Michael C.
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