This invention provides a phased array antenna comprising an input, a feed network electronically coupled to the input, a plurality of radiating elements, a plurality of continuously voltage tunable phase shifters for receiving signals from the feed network and providing phase shifts for the signals...http://www.google.de/patents/US6538603?utm_source=gb-gplus-sharePatent US6538603 - Phased array antennas incorporating voltage-tunable phase shifters
