Wireless transfer of power by a 35-GHz metamaterial split-ring resonator rectenna

TL;DR

This paper demonstrates a high-frequency wireless power transfer system using a 35-GHz metamaterial split-ring resonator rectenna, achieving about 1% efficiency and scalable power output with array configurations.

Contribution

Introduces a miniature split ring resonator rectenna for wireless power transfer at microwave frequencies, with experimental validation and array-based power scaling.

Findings

Resonance peaks match simulation predictions.

Maximum efficiency around 1% at 37.2 GHz.

Power output increased by a factor of 20 with 9-element array.

Abstract

Wireless transfer of power via high frequency microwave radiation using a miniature split ring resonator rectenna is reported. RF power is converted into DC power by integrating a rectification circuit with the split ring resonator. The near-field behavior of the rectenna is investigated with microwave radiation in the frequency range between 20-40 GHz with a maximum power level of 17 dBm. The observed resonance peaks match those predicted by simulation. Polarization studies show the expected maximum in signal when the electric field is polarized along the edge of the split ring resonator with the gap and minimum for perpendicular orientation. The efficiency of the rectenna is on the order of 1% for a frequency of 37.2 GHz. By using a cascading array of 9 split ring resonators the output power was increased by a factor of 20.