Wireless Power Transfer via Strongly Coupled
Magnetic Resonances
Science | Vol. 317. no. 5834, pp. 83 - 86
June 6, 2007
Andre Kurs, Aristeidis Karalis, Robert Moffatt, J. D.
Joannopoulos, Peter Fisher, Marin Soljačić
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.
Efficient wireless non-radiative mid-range energy transfer
Annals of Physics | Vol. 323, Issue 1, pp 34 - 48
June 8, 2007
Aristeidis Karalis, J.D. Joannopoulos and Marin
Soljačić
Abstract: We investigate whether, and to what extent,
the physical phenomenon of long-lifetime resonant
electromagnetic states with localized slowly-evanescent
field patterns can be used to transfer energy efficiently
over non-negligible distances, even in the presence of
extraneous environmental objects. Via detailed theoretical and numerical
analyses of typical real-world model-situations and realistic material
parameters, we establish that such a non-radiative scheme can lead to
“strong coupling” between two medium-range distant such states and
thus could indeed be practical for efficient medium-range wireless energy transfer.
Corp. logo and WiTricity name are trademarks of WiTricity Corporation. These marks refer only to the products and proprietary technology of WiTricity Corporation, and should not be used to refer to wireless electricity in a generic sense.