Optical time delay units for phased array antennas

Details Optical time delay units for phased array antennas Optical time delay units for phased array antennas

1992-06-18

1993-12-28

Issing, Gregory C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

25022712, 342368, H01Q 322, H01T 516

Patent

active

052743853

ABSTRACT:
A phased array antenna system having an optical signal processing system includes a number of optical time delay units to generate differentially time-delayed optical signals. Each optical time delay unit is configured to generate a time delay through the use of either an optical fiber or free-space optical propagation delay assembly. Differentially time delayed optical signals are generated by controlling, with a spatial light modulator, the polarization of each light beam entering each time delay unit so that each respective light beam is deflected along either a direct path or a delay path dependent on its linear polarization. Each time delay unit includes an imaging system having a selected imaging ratio, with spherical lenses disposed in the delayed and direct light paths of the unit to provide imaging between the spatial light modulator planes. High extinction ratio polarizers are positioned in each of the delayed and direct paths. Spatial filters are further disposed in each spherical lens pair.

REFERENCES:
patent: 4028702 (1977-06-01), Levine
patent: 4813766 (1989-03-01), Keene
patent: 5117239 (1992-05-01), Riza
patent: 5144321 (1992-09-01), Biet
patent: 5187487 (1993-02-01), Riza
patent: 5191339 (1993-03-01), Riza
U.S. patent application Ser. No. 07/826,501.

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