Metasurface with Wide-Angle Reception for Electromagnetic Energy Harvesting

Abstract

A wide-angle and polarization-insensitive metasurface instead of traditional antenna is built as the primary ambient energy harvester. Proposed metasurface harvester can receive electromagnetic (EM) energy from wide angles and received rectified power can be combined by DC combining for EM harvesting system. The reflection coefficient, power distribution, EM harvesting efficiency, and absorption efficiency on the normal and oblique incidences are studied and presented. For a single unit cell with periodic boundary condition, simulation results exhibit that the absorption and harvesting efficiencies are more than 98 and 96%, respectively, under normal incidence at an operating frequency of 2.4 GHz. The results also show that on the oblique incidence of 0°, the maximum absorption efficiency is more than 98% and it can achieve more than 80% reception efficiency at the incidence angle of ±60°.