Wireless power transfer system, power transmitter, and rectenna base station

A rectenna base station which receives and combines a microwave transmitted from each of a plurality of power transmitters to generate power, the rectenna base station comprising:

• a rectenna which receives the microwave;
• a pilot signal transmission antenna which transmits a pilot signal to the power transmitters;
• and
• a phase monitor and control section which specifies an identification code for identifying each of the power transmitters and generates a command signal to change a phase of the power transmitter identified by the identification code so as to increase a power value received at the rectenna.

A power transmitter which transmits a microwave to a rectenna base station, the power transmitter comprising:

• a plurality of transmission antenna elements, each of which transmits a microwave to the rectenna base station;
• a pilot signal reception antenna which receives a pilot signal from the rectenna base station;
• a tracking receiver which detects an arrival direction of the pilot signal received at the pilot signal reception antenna;
• a beam drive control section which performs phase adjustment so that the microwave transmitted from the plurality of transmission antenna elements points in the arrival direction of the pilot signal detected by the tracking receiver;
• and
• a phase controller which makes phase change of the microwave based on a command signal, which specifies an identification code and is transmitted from the rectenna base station for changing the phase of the microwave, if the specified identification code matches a stored identification code.