A Frequency Selective High-Efficiency Broadband RF Rectifier Using Dual-Branch Structure

This letter proposes a broadband, high-efficiency radio frequency (RF) rectifier with a frequency selective topology and simple structure for wireless power transmission (WPT). The rectifier comprises two subrectifying units, without any additional matching circuits at the input end. Using its frequency selective topology, the two subrectifying units operate in the low- and high-frequency bands, respectively, ensuring efficiency and expanding the operating bandwidth. The design was validated through fabrication, and the measured results align closely with simulation data. Measurements indicate a fractional bandwidth of 84.4% (1.3–3.2 GHz), with a power conversion efficiency (PCE) exceeding 60%, peaking at 71% at an input power of 8 dBm. The efficiency remains above 50% across the 1.3–3.3-GHz range at an input power of 5 dBm.