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Midfield wireless powering of subwavelength autonomous devices
Sanghoek Kim1, John S Ho1, Ada S Y Poon1
1Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA.
Abstract:
We obtain an analytical bound on the efficiency of wireless power transfer to a weakly coupled device. The optimal source is solved for a multilayer geometry in terms of a representation based on the field equivalence principle. The theory reveals that optimal power transfer exploits the properties of the midfield to achieve efficiencies far greater than conventional coil-based designs. As a physical realization of the source, we present a slot array structure whose performance closely approaches the theoretical bound.
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