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Published Online June 7, 2007
Science DOI: 10.1126/science.1143254

Research Articles

Submitted on March 30, 2007
Accepted on May 21, 2007

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 Soljacic 1

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.
André Kurs , E-mail: akurs{at}mit.edu

Using self-resonant coils in a strongly coupled regime, we experimentally demonstrate efficient non-radiative power transfer over distances of up to eight times the radius of the coils. We demonstrate the ability to transfer 60W with approximately 40% efficiency over distances in excess of two meters. We present a quantitative model describing the power transfer which matches the experimental results to within 5%. We discuss practical applicability and suggest directions for further studies.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)