A Novel Class-F 2.45/5.8 GHz Dual-Band Rectifier for Wireless Power Transmission

TL;DR

This paper introduces a high-efficiency dual-band class-F rectifier for wireless power transfer operating at 2.45 and 5.8 GHz, demonstrating significant efficiency improvements through harmonic control.

Contribution

It presents a novel dual-band class-F rectifier design with harmonic termination and matching networks, validated by measurements showing high efficiency at both frequencies.

Findings

Maximum RF-dc efficiency of 74.9% at 2.45 GHz

Maximum RF-dc efficiency of 61.9% at 5.8 GHz

Effective dual-band harmonic control achieved

Abstract

This letter proposes a high-efficiency dual-band class-F rectifier for wireless power transmission (WPT). The rectifier comprises a dual-band harmonic termination network, a dual-band matching network, a single Schottky diode, and a dc pass filter. A theoretical analysis of the harmonic termination network is performed to improve the rectifying efficiency. The network exhibits good class-F operation by controlling the second and third harmonics in dual bands. A rectifier operating at 2.45 and 5.8 GHz was designed, fabricated, and measured for validation. The measurements show maximum RF-dc conversion efficiencies of 74.9% and 61.9% with 200 and 500{\Omega} loads at 2.45 and 5.8 GHz, respectively. The proposed rectifier achieves dual-band harmonic control with high efficiency.