Antenna feed arrangement for correcting for astigmatism

Communications: radio wave antennas – Antennas – Wave guide type

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343786, 343839, H01Q 1920, H01Q 1913

Patent

active

044828985

ABSTRACT:
The present invention relates to an antenna feed arrangement for correcting for astigmatism caused by an offset main reflector. The feed arrangement comprises at least one feed element, a first and a second cylindrical reflector disposed along the feed axis of the antenna with corresponding axes across the reflecting surfaces thereof oriented orthogonal to each other, and a pair of plates comprising a conductive material which are disposed parallel to, and on either side of, the feed axis of the antenna to enclose the area between the at least one feed element and the first reflector while forming an aperture thereof within a predetermined distance from the second reflector. The feed arrangement components are oriented with respect to each other and the aperture of the antenna to provide separate phase centers with a predetermined spacing therebetween on the feed axis for the two principal planes of curvature of a wavefront illuminating the antenna aperture to correct for astigmatism, which predetermined spacing can be selectively changed.

REFERENCES:
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: 4145695 (1979-03-01), Cans
patent: 4224626 (1980-09-01), Sternberg
patent: 4339757 (1982-07-01), Chu
patent: 4343004 (1982-08-01), Ohm
Dragone; An Improved Antenna for Microwave Radio Systems; BSTJ, vol. 53, No. 7, Sep. 1974, pp. 1406-1415.
Acampora et al.; A Satellite System with Limited-Scan Spot Beams, IEEE Trans. on Comm., vol. COM-27, No. 10, 10-79, pp. 1406-1415.

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