Communications: radio wave antennas – Antennas – Wave guide type
Patent
1980-11-24
1982-07-13
Lieberman, Eli
Communications: radio wave antennas
Antennas
Wave guide type
343781CA, 343909, H01Q 1913
Patent
active
043397573
ABSTRACT:
The present invention relates to an antenna arrangement capable of correcting for astigmatism over a broadband range, the antenna arrangement comprising a main focusing reflector arrangement (10), such as, for example, a Cassegrain antenna system, a feed (12) and astigmatic correction means (14) disposed between the feed and the main focusing antenna arrangement. The astimatic correction means comprises a first and a second doubly curved subreflector (16, 18) or lens (30, 32) which are curved in orthogonal planes to permit the launching of an astigmatic beam of constant size and shape over a broadband range.
REFERENCES:
patent: 3146451 (1964-08-01), Sternberg
patent: 3569975 (1971-03-01), Fretz
patent: 3688311 (1972-08-01), Salmon
patent: 3737909 (1973-06-01), Bartlett et al.
patent: 3792480 (1974-02-01), Graham
patent: 3821746 (1974-06-01), Mizusawa et al.
patent: 3828352 (1974-08-01), Drabowitch et al.
patent: 3922682 (1975-11-01), Hyde
patent: 3995275 (1976-11-01), Betsudan et al.
patent: 4145695 (1979-03-01), Gans
patent: 4224626 (1980-09-01), Sternberg
Ohm & Gans, Numerical Analysis of Multiple-Beam Offset Cassegrainian Antennas, AIAA Paper No. 76-301, Apr. 1976.
Bell Telephone Laboratories Incorporated
Lieberman Eli
Pfeifle Erwin W.
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