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Proceedings Paper

Photonic true-time-delays based on multiplexed substrate-guided wave propagation for phased array antenna applications
Author(s): Ray T. Chen; Richard Liqiang Li
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Paper Abstract

A compact and affordable photonic true-time-delay (TTD) beam steering device for phased array antenna applications using multiplexed substrate-guided wave propagation is presented. The TTD design uses holographic input and output couplers to change the direction of beam propagation as well as optical fanout. Optical delays of various delay lines can be adjusted easily through the substrate thickness and the total internal reflection angle inside the substrate material. Broadband microwave signals for feeding the radiating elements are generated through optical heterodyne technique and they are detected by metal-semiconductor-metal detector arrays. The physical aspects of phase-shifters and true-time-delays are first introduced. Then design issues on the photonic TTD architecture and practical constraints on making holographic grating couplers are discussed, especially concerning with recording gratings on DuPont photopolymer materials. Finally, the generation and detection of high frequency microwave signals up to 25 GHz by optical heterodyne techniques are illustrated.

Paper Details

Date Published: 5 November 1996
PDF: 9 pages
Proc. SPIE 2845, Radar Processing, Technology, and Applications, (5 November 1996); doi: 10.1117/12.257242
Show Author Affiliations
Ray T. Chen, Univ. of Texas/Austin (United States)
Richard Liqiang Li, Univ. of Texas/Austin (United States)

Published in SPIE Proceedings Vol. 2845:
Radar Processing, Technology, and Applications
William J. Miceli, Editor(s)

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