Abstract
A wideband (>10 GHz)
beamformer, based on a photonic true-time-delay, with submicrosecond scan-angle
switching is reported. The smooth microwave transmission (ripples <0.5 dB and <3°) and superb uniformity among the
elements (<0.1 dB
and <0.5°)
are then used for the processing of 1 GHz-wide linear frequency modulation
(LFM) signals in both the C and X bands with excellent performance. This performance
is also maintained under dynamic operation, where a fast tunable laser is
employed to provide <300 ns wavelength-controlled angle scanning. Based on these characteristics,
an optimized architecture, where a photonic beamformer feeds a series of classical
subarrays, can offer high performance in both the time and spatial domains
for large, wideband phased-array antennas, with wide scan angles.
© 2008 IEEE
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