Transponder with selective antenna beam using shared antenna feed elements

摘要: A transponder that selectively provides both global and spot beam antenna coverage. The comprises a channel amplifier an feed network includes coupler means for coupling energy into plurality of power distribution networks radiating elements form illuminates the desired coverage area. variable divider is coupled to variably couples along two output paths. Each path matched bandpass filter second phase delay circuit. Selective control ratio respective paths, provided by circuit, selective total either full set, or selected subset which generates beams, respectively. more complex version described additionally incorporates N-channel multiplexer. present invention may also be employed as interface circuit interposed between retrofit existing transponders provide selectable