Dual-Band Multilayer Energy Harvesting Surface

An efficient dual-band energy harvesting surface (EHS) array is presented using two stacked-layer of cross-dipole elements for efficient harvesting at two frequency bands for multiple polarizations. The proposed EHS array introduces the concept of stacked surfaces that can be directly integrated and matched with rectification circuitries. Each layer of the EHS array is dedicated to harvesting at a particular frequency band with its own directly matched rectifying circuity allowing better AC to DC matching and harvesting efficiency at each frequency band. The simulation results of the dual-band EHS energy harvesting array show overall radiation to AC harvesting efficiencies of 95% and 93%, respectively, at various polarization angles at the desired operating frequencies of 2.7 GHz and 3.4 GHz.