Energy Harvesting in the Microwaves Spectrum Using Electrically Small Resonators

This paper presents energy harvesting improvements utilizing electrically small resonators. A single bow-tie antenna and a split ring resonator (SRR) working at the same frequency of 5.8 GHz are designed. The bow-tie antenna achieves about 12 % power efficiency, whereas the SRR achieves more than 37 %. A new efficiency term is also proposed to take into account the footprint reduction and efficiency advancement resulting from SRR elements. Two arrays of SRRs and bow-tie antennas are designed to occupy identical footprints. Microwave power harvesting efficiency of 60 and 15.2 % for the SRRs and bow-tie arrays, respectively, are achieved.

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