Rectifying Metasurfaces for Wireless Energy Harvesting System

In this chapter, an overview of wireless power transfer (WPT) and wireless energy harvesting (WEH) technologies, followed by a detailed examination of the utilization of metamaterials and metasurfaces in WPT and WEH. Firstly, we discusses metasurfaces for ambient energy harvesting (AEH), encompassing their recent progress, discussion, and potential future opportunities. Then, AEH systems based on metasurfaces and antennas are compared. In addition, to enhancing the effectiveness of energy collection systems, metasurfaces also broaden their applicability to various types of devices. The next step was to present two cases in which metasurfaces were designed for AEH. One of the metasurfaces features a closed-ring butterfly array and is wide-angle and polarizated-angle-independent, while the other metasurface is dual-band, rectifying integrated, and insensitive to the polarization angle. To simplify the ambient energy harvester’s structure, a novel surface-mount component incorporating method is developed. The metasurface’s high-impedance characteristics and its multi-mode resonance make it possible to directly eliminate the matching network between it and the non-linear rectifier. The above designs have been tested, and the excellent performances proved the huge application prospect of metasurface in the field of WEH.