Magnetic Metamaterial Superlens for Increased Range Wireless Power Transfer

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...

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Bibliographic Details
Published in:Scientific reports 2014-01, Vol.4 (1), p.3642-3642, Article 3642
Main Authors: Lipworth, Guy, Ensworth, Joshua, Seetharam, Kushal, Da Huang, Lee, Jae Seung, Schmalenberg, Paul, Nomura, Tsuyoshi, Reynolds, Matthew S., Smith, David R., Urzhumov, Yaroslav
Format: Article
Language:English
Subjects:
639/301/1005/1007
639/766/1130/2798
Aperture
Efficiency
Energy conservation
Humanities and Social Sciences
Magnetic fields
multidisciplinary
Permeability
Science
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Summary: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.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep03642