Compact High-Efficiency All-Polarization Rectenna for Wireless Power Transmission

TL;DR

This paper introduces a compact, high-efficiency all-polarization rectenna for wireless power transfer that simplifies design and achieves over 63% efficiency across all polarization angles at 2.45 GHz.

Contribution

It presents a novel rectenna design with direct conjugate matching and virtual ground concept, enabling high efficiency without external matching networks.

Findings

RF-to-DC efficiency exceeds 63% for all polarization angles.

Peak efficiency of 82.2% at 2.45 GHz.

Compact design reduces overall size of the rectenna.

Abstract

In this letter, we present an innovative design for a compact, high-efficiency all-polarization receiving rectenna tailored for wireless power transmission. This rectenna, which integrates an antenna with two same rectifier units, employs direct conjugate matching of antenna impedance to rectifier impedance. This approach eliminates the necessity for an external impedance-matching network, thereby reducing the overall dimensions of the rectenna. The implementation of virtual ground concept streamlines the design of the rectifier's output filter. The low-profile antenna, engineered for operation at 2.45 GHz, demonstrates high conversion efficiency across all polarization angles. The measured RF-to-DC efficiency exceeds 63% for all polarization angles, achieving a peak efficiency of 82.2%.