Development of bread board model for microwave power transmission experiment from space to ground using small scientific satellite

We are developing a bread board model for a microwave wireless power transmission (WPT) from a satellite in orbit to the ground. WPT using microwaves is one of the critical and important technologies toward a solar power satellite (SPS). We have carried out a conceptual design and proposed a space experiment using a scientific small satellite which has been developing by JAXA. The purposes of the space experiments are to demonstrate a precise directional control of WPT technology for SPS, which includes the direct detection of rectenna sites, and the microwave beam control skill with high angular precision, and to clarify the propagation characteristics of the microwave power in the ionosphere. Performances of the breadboard were measured and evaluated. Thermal transient characteristics of the breadboard model were simulated.