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Fiber-optic true time steering of an ultrawide-band receive array

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3 Author(s)
Frankel, M.Y. ; Opt. Sci. Div., Naval Res. Lab., Washington, DC, USA ; Matthews, P.J. ; Esman, R.D.

We report the development and demonstration of the first true time-delay (TTD) fiber-optic beamformer for ultrawideband antenna receive operation. The beamformer is based on a dispersive-fiber prism configuration that properly time delays the signals originating at each receiving element for coherent combining in the microwave domain. The time-steered receive antenna consists of eight spiral elements arranged into a one-dimensional (l-D) sparsely populated array. The receive array shows an instantaneous bandwidth of 6-18 GHz, limited by the available matched microwave amplifiers. The array performance is measured in an anechoic chamber and exhibits unprecedented squint-free steering over an azimuth scan of 120° over the full frequency range

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:45 ,  Issue: 8 )

Date of Publication:

Aug 1997

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