Midfield wireless powering of subwavelength autonomous devices.

@article{Kim2013MidfieldWP,
  title={Midfield wireless powering of subwavelength autonomous devices.},
  author={Sanghoek Kim and John S. Ho and Ada S. Y. Poon},
  journal={Physical review letters},
  year={2013},
  volume={110 20},
  pages={203905}
}
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… CONTINUE READING
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