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Optical Engineering

Photonic in-phase/quadrature beam-forming network for phased array antenna applications
Author(s): James F. Coward; Ting K. Yee
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Paper Abstract

A photonic in-phase/quadrature (I-Q) rf phase shifter utilizing the signals from two integrated optic Mach-Zehnder modulators has been tested. This system demonstrates the capability of 360-deg phase control, less than 1-deg rf errors at constant amplitude, and less than 0.5-deg errors over a 30-dB rf amplitude taper. Using this technique, a four-channel beam-forming network was also developed and integrated with a printed patch, lightweight phased array antenna. High-accuracy linear beam control was achieved. Null patterns of more than 30 dB were produced on boresight. The null was steered to greater than 30 deg from boresight with a linear accuracy of approximately 1 deg.

Paper Details

Date Published: 1 June 1993
PDF: 5 pages
Opt. Eng. 32(6) doi: 10.1117/12.134049
Published in: Optical Engineering Volume 32, Issue 6
Show Author Affiliations
James F. Coward, Lockheed Missiles & Space Co., Inc. (United States)
Ting K. Yee, Lockheed Missiles & Space Co., Inc. (United States)

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