Relay effect of wireless power transfer using strongly coupled magnetic resonances

Fei Zhang, Steven A. Hackworth, Weinong Fu, Chengliu Li, Zhihong Mao, Mingui Sun

Research output: Journal article publicationJournal articleAcademic researchpeer-review

174 Citations (Scopus)


Wireless power transfer using strongly coupled electromagnetic resonators is a recently explored technology. Although this technology is able to transmit electrical energy over a much longer distance than traditional near field methods, in some applications, its effective distance is still insufficient. In this paper, we investigate a relay effect to extend the energy transfer distance. Theoretical analysis is performed based on a set of coupled-mode equations. Experiments are conducted to confirm the theoretical results and demonstrate the effectiveness of the relay approach. Our results show that the efficiency of power transfer can be improved significantly using one or more relay resonators. This approach significantly improves the performance of the present two-resonator system and allows a curved path in space to be defined for wireless power transfer using smaller resonators.
Original languageEnglish
Article number5754774
Pages (from-to)1478-1481
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number5
Publication statusPublished - 1 May 2011


  • Relay effect
  • strongly coupled magnetic resonance
  • wireless electricity
  • wireless power transfer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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