Low power beam switchable antenna arrangement

Details Low power beam switchable antenna arrangement Low power beam switchable antenna arrangement

1981-09-21

1983-11-15

Lieberman, Eli

Communications: radio wave antennas

Antennas

With spaced or external radio wave refractor

343779, H01Q 1906, H01Q 1917

Patent

active

044159013

ABSTRACT:
The present invention relates to a low power, beam switchable, antenna comprising a focusing reflector (14), a plurality of feedhorns (10.sub.1 -10.sub.N) disposed on a surface (.SIGMA.) adjacent the focal surface of the focusing reflector, and an amplifying array (20, 24, 28) disposed in the aperture of the focusing reflector. A spherical wavefront launched by a feedhorn is reflected by the focusing reflector into a first planar wavefront which is intercepted by the amplifying array using a planar array of first feed elements (20.sub.1 -20.sub.X) disposed on a fourier transform surface (.SIGMA.') of the surface on which the feedhorns are disposed. The signal produced by each of the first feed elements associated with a first planar wavefront is separately amplified with an equal relative phase shift to the other associated intercepted signals and reradiated in a second planar wavefront by a planar array of second feed elements (28.sub.1 -28.sub.X) having the same tilt and direction as the first planar wavefront.

REFERENCES:
patent: 3576579 (1971-04-01), Appelbaum et al.
patent: 3631503 (1971-12-01), Tang et al.
patent: 3835469 (1974-09-01), Chen et al.
patent: 3914768 (1975-10-01), Ohm
patent: 4236161 (1980-11-01), Ohm

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