Continuous wideband dual‐channel‐based high‐efficiency rectifier for wireless charging systems

Abstract

A microwave continuous wideband rectifier using dual-channel structure with high power conversion efficiency for wireless charging system is proposed in this paper. The Schottky diode HSMS-286 E is adopted to realize the highpower conversion efficiency. The wide bandwidth is achieved by using the multipath combining circuit, which can be applied to design high-efficiency rectifier with arbitrary bandwidth and multiple channels. Two single-channel rectifiers working from 1.5 to 2 GHz and 2 to 2.5 GHz are designed respectively. The simulated power conversion efficiencies of the two circuits are both more than 70%. Based on the single-channel rectifiers, a dual path rectifier operating from 1.5 to 2.5 GHz is designed, fabricated, and measured. The measured power conversion efficiency within 1 GHz bandwidth is more than 60% with the input power of 15.4 dBm. The measured results of the proposed rectifier agree well with the simulated ones. The presented rectifier has the advantages of wide bandwidth, and high-power conversion efficiency.