The Kansai Electric Power Company has succeeded in power transmission by means of aerial microwave in cooperation with Kyoto and Kobe Universities. We set a parabola antenna of a diameter of 3m for the transmission antenna, and a square-shaped Rectenna (termed as an abbreviation of Rectifying Antnna) array of 3.2m×3.6m for the receiving antenna. The distance between the transmitter and the receiver was 42m. We finally gained the receiving power of 0.75kW for the transmitted power of 5kW.