Design and test of microwave power transmission system

Microwave power transmission served as the core technology of the Space Solar Power Satellite (SSPS) was studied. The rectifying surface was researched based on the concept of perfectly matched layer to solve the problem that beam collection efficiency would decline with distance away from transmitting antenna because of the spread of beam, by changing perfectly matched layer structure conjugate match between antenna output impedance and rectifier circuit input impedance. The rectifying surface exhibits a strong restrain to high-order harmonics, without the need of RF filter which is an important element for the traditional rectenna, so the circuit structure is simple and high conversion efficiency energy can be realized. And under the proposed limit for the center-of-beam power density to assure environmental health and safety for microwave transmission, an experimental system with solid power amplifier at 5.8 GHz was constructed and tested, and the maximum conversion efficiency is 57.7%. The experiment results show that the designed microwave power transmission system is benefit for ground demonstration testing in miniature version and building of SSPS in future.