Miniaturized delay-time-enhanced photopolymer waveguide hologram module for phased-array antenna

Miniaturized, delay-enhanced, continuous true-time delay modules based on the holographic dispersion have been designed, fabricated, and demonstrated to provide squint-free beam steering for K-, Ku-, and X-band (8-26.5 GHz) phased-array antenna systems. A novel symmetric structure is employed in the system to achieve large delays and high packaging density. The delay modules operating in the 1550-nm region provide 130 ps of continuously tunable time delay. Far-field radiation patterns measured at 18 and 22 GHz have experimentally verified the K-band beam-scanning coverage from -45° to +45°.