Magnetic metamaterial superlens for increased range wireless power transfer.
Abstract
The ability to wirelessly power electrical devices is becoming of greater urgency
as a component of energy conservation and sustainability efforts. Due to health and
safety concerns, most wireless power transfer (WPT) schemes utilize very low frequency,
quasi-static, magnetic fields; power transfer occurs via magneto-inductive (MI) coupling
between conducting loops serving as transmitter and receiver. At the "long range"
regime - referring to distances larger than the diameter of the largest loop - WPT
efficiency in free space falls off as (1/d)(6); power loss quickly approaches 100%
and limits practical implementations of WPT to relatively tight distances between
power source and device. A "superlens", however, can concentrate the magnetic near
fields of a source. Here, we demonstrate the impact of a magnetic metamaterial (MM)
superlens on long-range near-field WPT, quantitatively confirming in simulation and
measurement at 13-16 MHz the conditions under which the superlens can enhance power
transfer efficiency compared to the lens-less free-space system.
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https://hdl.handle.net/10161/8312Published Version (Please cite this version)
10.1038/srep03642Publication Info
(2014). Magnetic metamaterial superlens for increased range wireless power transfer. Sci Rep, 4. pp. 3642. 10.1038/srep03642. Retrieved from https://hdl.handle.net/10161/8312.This is constructed from limited available data and may be imprecise. To cite this
article, please review & use the official citation provided by the journal.
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David R. Smith
James B. Duke Distinguished Professor of Electrical and Computer Engineering
Dr. David R. Smith is currently the James B. Duke Professor of Electrical and Computer
Engineering Department at Duke University. He is also Director of the Center for Metamaterials
and Integrated Plasmonics at Duke and holds the positions of Adjunct Associate Professor
in the Physics Department at the University of California, San Diego, and Visiting
Professor of Physics at Imperial College, London. Dr. Smith received his Ph.D. in
1994 in Physics from the University of California, San D
Yaroslav A. Urzhumov
Adjunct Assistant Professor in the Department of Electrical and Computer Engineering
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<![endif]-->Dr. Urzhumov is Adjunct Assistant Professor of ECE at Duke University,
and also a Technologist at the Metamaterials Commercialization Center of Intellectual
Ventures. Previously a research faculty at Duke, he works on applied and theoretical
aspects of metama
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