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Wireless transfer of power via high frequency microwave radiation using aminiature split ring resonator rectenna is reported. RF power is converted intoDC power by integrating a rectification circuit with the split ring resonator.The near-field behavior of the rectenna is investigated with microwaveradiation in the frequency range between 20-40 GHz with a maximum power levelof 17 dBm. The observed resonance peaks match those predicted by simulation.Polarization studies show the expected maximum in signal when the electricfield is polarized along the edge of the split ring resonator with the gap andminimum for perpendicular orientation. The efficiency of the rectenna is on theorder of 1% for a frequency of 37.2 GHz. By using a cascading array of 9 splitring resonators the output power was increased by a factor of 20.

Wireless transfer of power by a 35-GHz metamaterial split-ring resonator rectenna