Communications: radio wave antennas – Antennas – Wave guide type
Patent
1977-03-01
1979-03-20
Smith, Alfred E.
Communications: radio wave antennas
Antennas
Wave guide type
343781CA, 343781P, 343837, H01Q 1914, H01Q 1910
Patent
active
041456955
ABSTRACT:
The present invention relates to novel launcher reflectors which are used with reflector antenna systems to compensate for the dominant aberration of astigmatism which was found to be introduced in the signals being radiated and/or received at the off-axis positions. A major portion of such phase error is corrected by using, with each off-axis feedhorn, an astigmatic launcher reflector having a curvature and orientation of its two orthogonal principal planes of curvature which are chosen in accordance with specific relationships, the launcher reflector being fed by a symmetrical feedhorn.
REFERENCES:
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patent: 3569975 (1971-03-01), Fretz, Jr.
patent: 3688311 (1972-08-01), Salmon
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patent: 3792480 (1974-02-01), Graham
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patent: 3995275 (1976-11-01), Betsudan et al.
E. A. Ohm & M. J. Gans, Numerical Analysis of Multiple-Beam Offset Cassegrainian Antennas, in AIAA/CASI 6th Commun. Satellite Sys. Conf. Montreal, Canada, Apr. 5-8, 1976, paper 76-301.
Barlow Harry
Bell Telephone Laboratories Incorporated
Pfeifle Erwin W.
Smith Alfred E.
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