A compact high-efficiency rectifying circuit with class-F filter

Abstract

This paper proposes a compact high efficiency rectifying circuit with Class-F filter. The shunted diode topology structure is used to design the rectifying circuit with two-stage impedance match network. In order to reduce the power consumption on the diode, a Class-F filter consisting of two shunted microstrip lines has been added at the end of the diode. A cross-shaped microstrip stub works as DC-pass filter to reflect high harmonics and output stable DC voltage. The Class-F filter not only improves the conversion efficiency, but also makes the circuit structure more compact. According to the simulation results, the proposed circuit has a maximum conversion efficiency of 78% on 340Ω load at 11.2GHz when the input power is 19.5dBm. The RF-DC efficiencies are above 70% within 1.44GHz bandwidth from 10.4GHz to 11.84GHz. It is easy to be integrated with the receiving antenna and applied in the microwave power transmission system.