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Beamforming for Phased Array Antennas by Optical Means
Conference proceeding

Beamforming for Phased Array Antennas by Optical Means

N. V Jespersen and P. R Herczfeld
MILCOM 1986 - IEEE Military Communications Conference: Communications-Computers: Teamed for the 90's, v 2, pp 23.2.1-23.2.4
Oct 1986

Abstract

Antenna arrays Array signal processing Microwave antenna arrays Microwave circuits Optical arrays Optical attenuators Optical control Phase shifters Phased arrays Stimulated emission
Phased array beamforming requires the adjustment of both amplitude taper (primarily for side-lobe level control) and phase taper (for main beam coverage control) across a given antenna aperture. Such tapering is generally implemented by employing phase shifters and attenuators (or amplifiers) behind the individual radiating elements. Recently developed photosensitive microwave PIN diodes have opened up the possibility of realizing such circuits which can be controlled by optical rather than by electrical means. The implications of optical signalling (by fiberoptics) include reduced weight (as compared to copper conductors) and immunity from EMI/EMP effects, both of which are priority items in air- and spaceborne applications. The new microwave PIN diodes are applied in the analysis and design of beamform control circuits for phased array antennas. The diodes are characterized and applied in the design of an optically controlled reflective phase shifter.

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