Various antenna arrangements are provided with active transmit and receive antenna elements for transmitting and receiving signals within a cellular communication system. Also presented are specific base station antenna systems and methods, and portions thereof, which improve and control specific characteristics...http://www.google.fr/patents/US6900775?utm_source=gb-gplus-shareBrevet US6900775 - Active antenna array configuration and control for cellular communication systems
Active antenna array configuration and control for cellular communication ...
