Midfield Wireless Powering of Subwavelength Autonomous Devices

作者：Sanghoek Kim, John S. Ho, Ada S. Y. Poon · 发表于：Physical Review Letters · 年份：2013 · DOI：10.1103/physrevlett.110.203905 · 被引用次数：109 · 研究领域：Wireless Power Transfer Systems、Energy Harvesting in Wireless Networks、Antenna Design and Analysis

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.