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The objective of the present study is to investigate the feasibility of microwave power transmission to an airplane for future Mars observation. Airplane is a possibility of Mars observation with wide range and high resolution, compared to rover or satellite. Since the surface pressure of Mars atmosphere is much thinner than the Earth, weight reduction is essential to realize airplane flight on Mars. We therefore propose long-time flight on Mars by using microwave power transmission. We conducted terrestrial experiments of microwave power transmission to a prototype airplane. We developed a magnetron-based microwave transmitting system, the frequency of which was fixed with signal injection locking method. Rectennas (receiving antenna + rectifying circuit) were mounted on the prototype airplane for driving a propeller connected to an electric motor. Although autonomous flight was not successful yet, we demonstrated that the prototype airplane could fly by receiving the microwave power.

Feasibility Study on Microwave Power Transmission to an Airplane for Future Mars Observation