Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1983-05-11
1989-03-21
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342371, H01Q 322
Patent
active
048147737
ABSTRACT:
In a radar having electrical transmitting and receiving circuitry, and an antenna for the radiation of microwave signals, there is provided an optical feed system which couples the antenna with the transmitting and receiving circuitry. The feed system includes a set of optical multiplexers interconnected by sets of optical fibers. Microwave energy of the radar is converted to optical radiation for communication to the antenna, and then converted back to the microwave energy. Electro-optic modulators and photoelectric detectors provide for the energy conversion. A plurality of signals, including both signals having the transmit waveform as well as control signals, can be simultaneously coupled via the optical fibers by utilization of radiation of differing frequencies. The multiplexers include dichroic mirrors for separation of the radiations of the differing frequencies. The fiber optic feed system retains the full beam steering capacity of the radar and permits the use of conventional electronic circuitry with the feed network of the optical feed system.
REFERENCES:
patent: 3205495 (1965-09-01), Wilmotte
patent: 3878520 (1975-04-01), Wright et al.
patent: 4258363 (1981-03-01), Bodmer et al.
patent: 4330876 (1982-05-01), Johnson
patent: 4529986 (1985-07-01), d'Auria et al.
George M. Dillard, "Radar Signal Processing Using Fiber and Integrated Optics", Conference: Radar, 1977, pp. 363-367, London, England.
Arnold M. Levine, "Use of Fiber Optic Frequency and Phase Determining Elements in Radar", Conference: Proc. 33rd Annual Symposium on Freq. Control, Atlantic City, N.J., 1979, pp. 436-443.
Popa Adrian E.
Wechsberg Michael
Hughes Aircraft Company
Karambelas A. W.
Runk Thomas A.
Sotomayor John B.
Tarcza Thomas H.
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