Compact wide tunable bandwidth phased array antenna controller

Details Compact wide tunable bandwidth phased array antenna controller Compact wide tunable bandwidth phased array antenna controller

1992-03-05

1993-02-16

Issing, Gregory C.

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

Directive

Including a steerable array

342368, 359238, 359285, H01Q 322, G02B 2710, G02B 2746

Patent

active

051874873

ABSTRACT:
A compact, stable, and optically efficient two dimensional spatial light modulator-based electro-optical control system for large (>1000 elements) phase-based phased array antennas uses an acousto-optic modulator (AOM) driven by a microwave signal at the desired radar carrier. A phase delay is introduced via electrical control of an array of birefringent-mode nematic liquid crystal cells that selectively phase delays a polarized signal light beam, while a non-phase delayed doppler shifted polarized beam is used as a reference for microwave signal generation via interferometric detection through a photodiode. The optical design provides a very fast (in nsecs) wideband carrier hopping capability. An alternative embodiment of the invention uses a deformable mirror device (DMD) SLM to introduce the required phase shifts.

REFERENCES:
patent: 3878520 (1975-04-01), Wright
patent: 4864312 (1989-09-01), Huignard et al.
patent: 4929956 (1990-05-01), Lee et al.
patent: 4962382 (1990-10-01), Lee
patent: 4976520 (1990-12-01), Brandstetter et al.
patent: 5032002 (1991-07-01), Fonneland et al.
"Acousto-Optic Control of Phased-Array Antennas" N. A. Riza, May 1990, GE Technical Information Series.

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