A beam-forming network (98) employs one or a plurality of first transmission delay lines (168, 170, 172, 174) for receiving transmit signals (T1-T4) applied thereto, and a plurality of second transmission lines (176), which serve as line summers. Each of the first transmission delay lines has first and...http://www.google.de/patents/US4924234?utm_source=gb-gplus-sharePatent US4924234 - Plural level beam-forming network
