A C-band microwave rectifier without capacitors for microwave power transmission

TL;DR

This paper introduces a novel 5.8 GHz microwave rectifier that eliminates the need for capacitors, using filters and impedance matching techniques to achieve high efficiency suitable for microwave power transmission.

Contribution

A capacitor-free microwave rectifier design employing harmonic rejection and impedance matching for improved efficiency at 5.8 GHz.

Findings

Achieved 68.1% MW-to-DC conversion efficiency

Harmonic suppression using filters effectively replaces lumped capacitors

Measured results align with simulations, validating the design

Abstract

A microwave rectifier at 5.8 GHz without any capacitors is presented, which owns a measured MW-to-DC conversion efficiency of 68.1%. A harmonic rejection filter and a DC pass filter, which replace lumped capacitors in conventional microwave rectifiers, are applied to suppressing the harmonics produced by an HSMS-286 Schottky diode during rectifying. At the fundamental frequency, a microstrip impedance transformer which contains a shunt {\lambda}g/8 short-ended microstrip transmission line and two short series microstrip transmission lines are applied to compensating the imaginary impedance of the diode and matching the input impedance of the rectifier. The measured MW-to-DC conversion efficiency agrees well to the simulated results. The novel rectifier without any lumped passive elements may be applied for power transmission system at higher microwave frequencies.