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Proceedings Paper

Wavelength-division-multiplexing delay-broadcasting true-time-delay network for wideband phased array antennas
Author(s): Dennis R. Pape; Anastasios P. Goutzoulis
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Paper Abstract

Phased array antennas (PAAs) offer many advantages including steering without physical movement, accurate beam pointing, increased scan flexibility in two dimensions, precise PAA element phase and amplitude control to obtain low sidelobes, and reduced power consumption and weight. The complexity associated with controlling the many thousand array elements, while handling the broad bandwidth required of a shared antenna, makes the marriage of photonics and microwave radar attractive. To satisfy the simultaneous requirements of wide bandwidth and large antenna scan angle, true-time-delay (TTD) steering techniques are required so that efficient elemental vector summation (in the receive mode) or distribution (in the transmit mode) can be obtained that is independent of frequency or angle. We describe here a new lower complexity and cost photonic TTD system which we call WDM Delay Broadcasting TTD. This approach (1) encodes fixed delays with wavelength, (2) makes available all of the delays at each of the subarrays, and (3) selects the appropriate delay using an optical filter (with correction via the element electronic delay line). The results of this effort show that it is indeed possible to design and construct a photonically controlled TTD network that will exhibit the performance and cost benefits needed for widespread deployment in government and commercial phased array radar antenna systems.

Paper Details

Date Published: 22 May 1998
PDF: 4 pages
Proc. SPIE 3490, Optics in Computing '98, (22 May 1998); doi: 10.1117/12.308938
Show Author Affiliations
Dennis R. Pape, Photonic Systems Inc. (United States)
Anastasios P. Goutzoulis, Northrop Grumman ESSD (United States)

Published in SPIE Proceedings Vol. 3490:
Optics in Computing '98
Pierre H. Chavel; David A. B. Miller; Hugo Thienpont, Editor(s)

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