A phased-array architecture for retrodirective microwave power transmission from the space solar power satellite

This paper presents a phased array architecture for retrodirective microwave wireless power transmission from the space solar power satellite (SPS). The proposed architecture uses a 2.9-GHz pilot beam and a 5.8-GHz transmit beam, with retrodirective phasing implemented directly at RF. Experimental and theoretical results are given to validate the approach.