Unidirectional wireless power transfer using near-field plates

Mohammadreza F. Imani, Anthony Grbic

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


One of the obstacles preventing wireless power transfer from becoming ubiquitous is their leakage of power: high-amplitude electromagnetic fields that can interfere with other electronic devices, increase health concerns, or hinder power metering. In this paper, we present near-field plates (NFPs) as a novel method to tailor the electromagnetic fields generated by a wireless power transfer system while maintaining high efficiency. NFPs are modulated arrays or surfaces designed to form prescribed near-field patterns. The NFP proposed in this paper consists of an array of loaded loops that are designed to confine the electromagnetic fields of a resonant transmitting loop to the desired direction (receiving loop) while suppressing fields in other directions. The step-by-step design procedure for this device is outlined. Two NFPs are designed and examined in full-wave simulation. Their performance is shown to be in close agreement with the design predictions, thereby verifying the proposed design and operation. A NFP is also fabricated and experimentally shown to form a unidirectional wireless power transfer link with high efficiency.

Original languageEnglish (US)
Article number184903
JournalJournal of Applied Physics
Issue number18
StatePublished - May 14 2015
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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