A comparative study between novel witricity and traditional inductive magnetic coupling in wireless charging

Siu Lau Ho, Junhua Wang, Weinong Fu, Mingui Sun

Research output: Journal article publicationJournal articleAcademic researchpeer-review

146 Citations (Scopus)


A non-radiative energy transformer, commonly referred as Witricity and based on strong coupling between two coils which are separated physically by medium-range distances, is proposed to realize efficient wireless energy transfer. The distance between the resonators can be larger than the characteristic sizes of each resonator. Non-radiative energy transfer between the first resonator and the second resonator is facilitated through the coupling of their resonant-field evanescent tails. The proposed system operates as traditional inductive magnetic coupling devices when the operating frequencies are not the resonant frequency. Corresponding finite element analysis (FEA) and experiments have been carried out to facilitate quantitative comparison. Compared with typical magnetic inductive coupling energy transmission devices, the efficiency of the proposed system is much higher. This investigation indicates that it is feasible to use wireless energy transfer technology to recharge batteries, particularly in implant devices.
Original languageEnglish
Article number5754800
Pages (from-to)1522-1525
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number5
Publication statusPublished - 1 May 2011


  • Inductive magnetic coupling
  • resonant wireless energy transfer
  • strong coupling
  • witricity

ASJC Scopus subject areas

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

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