Communications: radio wave antennas – Antennas – Wave guide type
Patent
1982-05-10
1985-08-13
Lieberman, Eli
Communications: radio wave antennas
Antennas
Wave guide type
343837, H01Q 1516, H01Q 1919
Patent
active
045353387
ABSTRACT:
The present invention relates to a multibeam antenna arrangement comprising a main focusing reflector, a doubly curved subreflector disposed confocally with the main reflector and a plurality of feeds disposed on a doubly curved focal surface of the antenna on which an image of the far field of view is formed. The subreflector is doubly curved in orthogonal directions to introduce a predetermined amount of barrel distortion for transforming a three-dimensional, non-rectangular, matrix in the far field of the antenna arrangement into a substantially rectangular matrix on the doubly curved focal surface of the antenna arrangement. Feeds are aimed such that a central ray from each feed reflected by the subreflector impinges a common point on the main reflector. Beams of a satellite antenna introducing barrel distortion can be re-aimed toward a given set of earth coordinates when a satellite is moved in equatorial orbit by rotating the subreflector about an axis, which is substantially parallel to the axis of the earth, and which passes through the confocal point of the antenna.
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AT&T Bell Laboratories
Lieberman Eli
Pfeifle Erwin W.
Wimer Michael C.
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