Antennas for Microwave Power Transmission from a Solar Power Satellite to the Earth

This paper first explains the concept of a space solar power system, which includes a transmitting antenna called a spacetenna on a satellite and a receiving antenna called a rectenna on the earth. Both antennas are extraordinary in size. Then, the current study status of various kinds of SSPSs and relevant antennas are reviewed. As several technological issues are not solved yet, this paper possibly gives some hints of new research topics to readers.