Communications: radio wave antennas – Antennas – Wave guide type
Patent
1983-06-16
1985-03-05
Lieberman, Eli
Communications: radio wave antennas
Antennas
Wave guide type
343914, H01Q 1919
Patent
active
045034354
ABSTRACT:
The present invention relates to a multibeam antenna arrangement having minimal aberration of astigmatism and coma over a wide area of the focal surface of the antenna. The present antenna comprises a plurality of N reflectors arranged confocally in a sequence along a feed axis of the antenna and at least one feed disposed in the vicinity of a focal point on the focal surface. The reflectors and the at least one feed are further arranged to provide an equivalent centered antenna arrangement with the longitudinal axis of the feed corresponding to an equivalent axis of the centered arrangement for eliminating astigmatism. Coma is then eliminated by deforming two of the N reflectors in a predetermined manner.
REFERENCES:
patent: 4145695 (1979-03-01), Gans
patent: 4166276 (1979-08-01), Dragone
patent: 4224626 (1980-09-01), Sternberg
patent: 4339757 (1982-07-01), Chu
patent: 4343004 (1982-08-01), Ohm
Proc. of IEEE, vol. 59, No. 2, Feb. 1971, "A Reflector Antenna Corrected for Spherical, Coma and Chromatic Aberrations", by A. R. Panicali et al., pp. 311-312.
AP-S Intnat'l. Symposium, vol. II, Seattle, Washington, 1979, "Astigmatic Correction by a Deformable Subreflector", by W-X. Wong et al., pp. 706-709.
IEEE Trans. Antennas & Propagation, vol. AP-30, No. 3, May 1982, "A First Order Treatment of Aberrations in Cassegrainian and Gregorian Antennas", by C. Dragone, pp. 331-339.
AT&T Bell Laboratories
Lieberman Eli
Pfeifle Erwin W.
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