Communications: radio wave antennas – Antennas – Wave guide type
Patent
1987-06-10
1988-09-20
Sikes, William L.
Communications: radio wave antennas
Antennas
Wave guide type
343777, 343778, 342374, 342375, H01Q 1914
Patent
active
047728930
ABSTRACT:
A steerable multibeam five element cross-feed cluster antenna (16) system. The feed power is divided into five branches. Each branch includes a switching network (12A-12E) comprised of a plurality of time delay elements (90A; 92A) each individually controlled by a respective electromagnetic latching switch (56A,B; 58A,B; 60A,B; 62A,B; 46A,B). Frequency independent individual two-dimensional beam steering at IF scanning frequencies is thereby provided wherein discrete incremental time delays are introduced by the switching networks into each branch and the signals recombined thereafter to form each beam. The electromagnetic latched switching reduces power consumption and permits higher power switching and reciprocal coincident transmit and receive operation. Frequency independence due to incremental time delay switching permits coincident reciprocal operation and steering for transmit-receive signal paths carrying different transmit-receive frequencies. Diagonal quarter wave plates (30B-38B) in the wave guides (30-38) alter polarization from circular to orthogonal linear to provide transmitter-receiver isolation.
REFERENCES:
patent: 2751586 (1956-06-01), Riblet
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patent: 3495262 (1970-02-01), Paine
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patent: 4499472 (1985-02-01), Willett
Barr Hardie R.
Fein Edward K.
Le Hoang-anh
Manning John R.
Sikes William L.
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