Title :
Continuously variable true time-delay optical feeder for phased-array antenna employing chirped fiber grating
Author :
Corral, J.L. ; Martí, J. ; Regidor, S. ; Foster, Justin M. ; Laming, R. ; Cole, M.J.
Author_Institution :
ETSI Telecommun., Univ. Politecnica de Valencia, Spain
fDate :
8/1/1997 12:00:00 AM
Abstract :
In this paper, we present and demonstrate a novel approach of a true time-delay (TTD) optical feeder for phased-array antennas (PAAs). A continuously variable TTD is achieved by employing tunable lasers and a wide-bandwidth chirped fiber Bragg grating (FBG) as the dispersive element. The results show that a very high resolution performance (equivalent to a 6-b microwave phase shifter) is obtained for an L-band PAA employing narrow-tuning bandwidth lasers with a wavelength stability of 0.005 nm and a 4-nm bandwidth chirped grating with a dispersion of 835 ps/nm
Keywords :
antenna feeds; antenna phased arrays; array signal processing; diffraction gratings; laser beam applications; laser tuning; microwave antenna arrays; optical delay lines; optical fibres; Bragg grating; L-band; chirped fiber grating; continuously variable true time-delay; dispersive element; high resolution performance; narrow-tuning bandwidth lasers; phased-array antenna; true time-delay optical feeder; tunable lasers; wavelength stability; Antenna feeds; Bandwidth; Bragg gratings; Dispersion; Fiber gratings; Fiber lasers; Laser stability; Masers; Phase shifters; Tunable circuits and devices;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
