Highly-Efficient Double-Sided Dual-Band Polarization-Independent Metasurface Energy Harvester

In this paper, a novel highly-efficient dual-sided metasurface harvester is proposed. As an ambient energy harvester, the proposed structure absorbs the incident energy on two sides at two frequency bands. The top and bottom metasurfaces are formed by sub-wavelength Jerusalem cells and a symmetric ELC resonator, respectively. The proposed energy harvester is polarization-independent. As a result of two-side topology, the proposed structure incorporates four layers of low-loss substrates. The absorbed energy transfers to the input ports of the corresponding feeding network through the optimally positioned vias under the top and bottom harvesters. Simulations indicate excellent harvesting efficiencies of 94% and 93% calculated at 5.5 GHz and 7.2 GHz, for the top and bottom harvesters, respectively.