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Originally published in Science Express on 7 June 2007
Science 6 July 2007:
Vol. 317. no. 5834, pp. 83 - 86
DOI: 10.1126/science.1143254
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Research Articles

Wireless Power Transfer via Strongly Coupled Magnetic Resonances

André Kurs,1* Aristeidis Karalis,2 Robert Moffatt,1 J. D. Joannopoulos,1 Peter Fisher,3 Marin Soljacic1

Using self-resonant coils in a strongly coupled regime, we experimentally demonstrated efficient nonradiative power transfer over distances up to 8 times the radius of the coils. We were able to transfer 60 watts with ~40% efficiency over distances in excess of 2 meters. We present a quantitative model describing the power transfer, which matches the experimental results to within 5%. We discuss the practical applicability of this system and suggest directions for further study.

1 Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
2 Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
3 Department of Physics and Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

* To whom correspondence should be addressed. E-mail: akurs{at}mit.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Near-Field Plates: Subdiffraction Focusing with Patterned Surfaces.
A. Grbic, L. Jiang, and R. Merlin (2008)
Science 320, 511-513
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