We demonstrate an RF energy harvesting rectenna design based on a metamaterial perfect absorber (MPA). With the embedded Schottky diodes, the rectenna converts captured RF waves to DC power. The Fabry-Perot (FP) cavity resonance of the MPA greatly improves the amount of energy captured. Furthermore, the FP resonance exhibits a high Q-factor and significantly increases the voltage across the Schottky diodes, which improves the rectification efficiency, particularly at low power. This leads to factor of 16 improvement of RF-DC conversion efficiency at ambient intensity level.
@article{arxiv.1705.07718,
title = {A Metamaterial-inspired Approach to RF Energy Harvesting},
author = {Clayton Fowler and Jiangfeng Zhou},
journal= {arXiv preprint arXiv:1705.07718},
year = {2017}
}