Communications: radio wave antennas – Antennas – Wave guide type
Patent
1980-11-24
1982-08-03
Lieberman, Eli
Communications: radio wave antennas
Antennas
Wave guide type
343914, H01Q 1919, H01Q 19195
Patent
active
043430040
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 Cassegrainian antenna system, a feed arrangement (12) and an astigmatic correction means (14) disposed between the feed arrangement and the main focusing antenna arrangement. The astigmatic correction means comprises a first and a second doubly curved subreflector (18, 16) which are curved in orthogonal planes to permit the launching or reception of an astigmatic beam of constant size and shape over a broadband range. By proper choice of the angle of incidence at each subreflector, cross-polarization and astigmatism of the beam can be canceled simultaneously.
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
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 et al.; Numerical Analysis of Multiple-Beam Offset Cassegrainian Antennas; AIAA/CHSI Conf., Apr. 5-8, 1976.
Bell Telephone Laboratories Incorporated
Lieberman Eli
Pfeifle Erwin W.
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