Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1992-01-27
1993-07-27
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342158, H01Q 334
Patent
active
052314057
ABSTRACT:
An optical control system for a phased-array antenna system employs a time-multiplexed optical control architecture to provide very fast (a few hundred beams per second) antenna beam scanning using slow (milliseconds) response spatial light modulators in two optical signal processing channels. In each channel a cascade of relatively slow switching speed nematic liquid crystal cell spatial light modulators and associated free space delay units or fiber optic delay cables are disposed to receive transmit or receive optical input signals comprising a plurality of light beams. The control voltages applied to the spatial light modulators determine the paths of the light beams through the cascade and the differential time delay imparted to the light beams in the input optical signal. High speed 90.degree. polarization rotators control the polarization of the transmit and receive optical input signals and the polarization of optical signals passing from the cascade, allowing for selecting the active channel and the transmit or receive mode of the active channel, thus enabling sequential rapid beam scans of the radar with a relatively short dead time between respective transmit/receive sequences. The spatial light modulators in the non-active channel are reconfigured during the dwell time of the active channel to set up for the next transmit/receive sequence.
REFERENCES:
patent: 4929956 (1990-05-01), Lee et al.
patent: 5117239 (1992-05-01), Riza
patent: 5144321 (1992-09-01), Biet
"Acousto-Optic Control of Phased-Array Antennas" by Nabeel A. Riza, GE Technical Information Series, pp. 1-33, May, 1990.
Finnan Patrick J.
General Electric Company
Ingraham Donald S.
Snyder Marvin
Tarcza Thomas H.
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