Scanable antenna arrangements capable of producing a large image

Details Scanable antenna arrangements capable of producing a large image Scanable antenna arrangements capable of producing a large image

1978-05-17

1980-05-13

Moore, David K.

Communications: radio wave antennas

Antennas

Wave guide type

343779, 343840, 343837, H01Q 1913

Patent

active

042031052

ABSTRACT:
The present invention relates to antennas which have reflector arrangements that produce a large image with minimal aberrations at the exit aperture thereof of a small feed array. In the present arrangement, the feed array is placed at the conjugate plane relative to the exit aperture of a geometrically confocal reflector system comprising a parabolic main reflector and a parabolic subreflector so that exact imaging of the array is obtained at the exit aperture. In such arrangements, alignment and surface accuracy errors of the various reflectors can be easily corrected by appropriately changing the phase or the position of the associated elements of the feed array. A three-reflector arrangement having sequential geometric confocality is disclosed which also alters the focal length of the main reflector sufficiently to permit the inclusion of polarization and/or frequency diplexing means in the overall reflector system.

REFERENCES:
patent: 3500427 (1970-03-01), Landesman et al.
patent: 3755815 (1973-08-01), Stangel et al.
patent: 3775769 (1973-11-01), Heerem et al.
patent: 3821746 (1974-06-01), Mizusawa et al.
W. D. Fitzgerald, "Limited Electronic Scanning With an Offset Feed Near-Field Gregorian System", Technical Report 486 of the Lincoln Laboratory (MIT), Sep. 24, 1971.
Y. Mizugutch, "Offset Dual Reflector Antenna", AP-5 International Symposium U. of Mass. Session 1, Oct. 11-15, 1976.

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