Polarization-Insensitive Wide-Angle Reception Triple-Band Metamaterial Unit Cell for Electromagnetic Energy Harvesting

Abstract

An efficient triple-band metamaterial unit cell with polarization-independent and wide-angle reception is proposed for ambient low-power electromagnetic energy harvesting applications. The unit cell top metal layer is composed of opposite corners circularly truncated square patch surrounded by a closed square ring with a small gap for coupling and the bottom metal layer is a full ground plane. The metal via is placed near the center by connecting the top patch and ground plane for harvesting the received electromagnetic power. This metal via is further connected to the ground in the bottom layer through a 50 Ω resistor. The received power is channeled through metal via and collected at resistive load. Simulation results show that the maximum harvesting efficiencies of 85.9%, 96.3%, and 95.8% are achieved at 2.66 GHz, 5.40 GHz, and 6.29 GHz frequencies in both transverse electric (TE) and transverse magnetic (TM) polarizations from 0° to 60° incidence angles. © 2021 IEEE.