A dual-band, polarization-insensitive, wide-angle metasurface array for electromagnetic energy harvesting and wireless power transfer

Abstract

A dual-band, polarization-insensitive, wide-angle metasurface array is presented in this article for electromagnetic (EM) energy harvesting in the UMTS-2100 band and Wi-Fi band. The metasurface unit cell is composed of two rings (each with four splits) nested in a centrosymmetric manner. The proposed metasurface array energy harvester consists of periodic array unit cells, a single series diode rectifier, and a load. The design of interconnected unit cells to form energy flow channels enhances the power density of the array terminals, thus improving the ability of the metasurface array to capture energy. In addition, the proposed resonant structure is centrosymmetric, so that consistent and effective collection efficiency can be obtained under different polarizations as well as at wide angular incidence. Moreover, the designed rectifier circuit enables the absorber to rectify dual bands simultaneously at low input power density. The prototype of the finite array is fabricated and tested in an anechoic chamber. The results show that the collection efficiency of the proposed metasurface array can reach 64.8% and 41.1% at two frequencies when the available power density reaches 46.4 μW/cm2.

Keywords

• Ambient energy harvesting (AEH)
• Dual-band rectenna
• Metasurface array
• Polarization-insensitive
• Rectifier
• Wide-angle incidence