Abstract
A photonic true-time delay beamforming system for phased array antennas
based on superstructured fiber Bragg gratings (SFBGs) with linearly increasing
equivalent chirps is proposed and demonstrated. The theory behind SFBGs with
equivalent chirps is detailed and a closed-form equation for the equivalent
dispersion is presented for the first time. Array factors, calculated based
on the experimentally measured time delays are shown for different wavelengths
of the photonic beamformer. An analysis of the errors present in the group
delay responses of the fabricated SFBGs is also presented.
© 2009 IEEE
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