Corral, J.L., Martí, J., Santos, A., Fuster, J.M., Capmany, J., Pastor, D., Cole, M.J. and Laming, R.I.
Continuously variable true time delay optical feeder for phased array antenna employing chirped fiber gratings.
IEEE Transactions on Microwave Theory, 45, (8), . (doi:10.1109/22.618471).
In this paper we propose and demonstrate a novel approach of true-time delay (TTD) optical feeder for phased-array antennas. A continuously variable TTD is achieved by employing tunable lasers and a wide bandwidth chirped fiber grating as dispersive element. The results show that a very high resolution performance (equivalent to a 6 bit microwave phase shifter) is obtained for a L-band phased-array antenna employing narrow tuning bandwidth lasers with a wavelength stability of 0.005 nm and a 4 nm bandwidth chirped grating with dispersion 835 ps/nm.
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