2017/05/07 by Clayton Fowler, Jiangfeng Zhou, Fowler, Clayton +1
Engineering · Materials Science · #Antenna Design and Analysis #Applied Physics (physics.app-ph) #Energy Harvesting in Wireless Networks #FOS: Physical sciences #Metamaterials and Metasurfaces Applications
paper · pdf · doi:10.48550/arxiv.1705.07717
openalex publication_date 2017/05/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A highly-efficient multi-resonant RF energy-harvesting rectenna based on a metamaterial perfect absorber featuring closely-spaced polarization-independent absorption modes is presented. Its effective area is larger than its physical area, and so efficiencies of 230% and 130% are measured at power densities of 10 uW/cm2 and 1 uW/cm2 respectively, for a linear absorption mode at 0.75 GHz. The rectenna exhibits a broad polarization-independent region between 1.4 GHz and 1.7 GHz with maximum efficiencies of 167% and 36% for those same power densities. Additionally, by adjustment of the distance between the rectenna and a reflecting ground plane, the absorption frequency can be adjusted to a limited extent within the polarization-independent region. Lastly, the rectenna should be capable of delivering 100 uW of power to a device located within 50 m of a cell-phone tower under ideal conditions.