The bandwidth limitation in space fed phased arrays (that results from the use of phase shifters to implement beam steering) is overcome by a lens arrangement in which independent feeds are provided at the focal plane of the lens. Each feed generates a collimated beam in a different spatial direction....http://www.google.fr/patents/US4381509?utm_source=gb-gplus-shareBrevet US4381509 - Cylindrical microwave lens antenna for wideband scanning applications
Cylindrical microwave lens antenna for wideband scanning applications
