Both-Side Retrodirective System for Minimizing the Leak Energy in Microwave Power Transmission

In terrestrial microwave power transmission systems, it is required to minimize the interference with communication and the influence on the human body. Retrodirective system that re-radiates a beam in the direction of arrival of a signal is well known as a beam control technique for accurate microwave power transmission. In this report, we newly propose to apply the retrodirective system to both transmitting and receiving antennas. A beam pilot signal with little leakage is not affected by the ground or the sea surface in horizontal propagation. The leakage to the outside of the system expects to minimize self-convergently while following the atmospheric fluctuation and the antenna vibration by repeating the retrodirective between the transmitting and receiving antenna.