Design of Rectifiers for High Power Wireless Power Transmission System

In the future, in order to commercialize wireless power transmission technology, it is considered that high power rectifier circuit will be indispensable. As its practical example, we succeeded in wireless transmission experiment of driving power and communication signal simultaneously to a television with magnetron as high power oscillator. However, the rectifiers used in receiver, it is a large circuit in which a plurality of low power rectifiers are arranged in parallel. So we think the volume of the receiver must be reduced, the area of rectifiers is most important. We designed 2.45 GHz and 5.8 GHz high power rectifiers with new GaAs diodes. Under optimum load resistance 100 Ωand optimum input power is 8 W conditions, the conversion efficiency of the 2.45GHz rectifier circuit is above 90%, the conversion efficiency of the 5.8 GHz rectifier is above 80% in simulation result. Then we made the 2.45GHz rectifiers, and measure the efficiency and reflection. The rectifiers have 60% conversion efficiency. The results is not consistent with the simulation result. In the future work, we will improve the high frequency diode model used and further improve the conversion efficiency of high power rectifiers.