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.
- Received 5 December 2012
DOI:https://doi.org/10.1103/PhysRevLett.110.203905
© 2013 American Physical Society
Focus
Wireless Power for Tiny Medical Devices
Published 17 May 2013
A new technique for powering medical implants wirelessly could allow them to shrink to sub-millimeter sizes in the future, according to theory and simulations.
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