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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Lipworth G,Ensworth J,Seetharam K,Huang D,Lee JS,Schmalenberg P,Nomura T,Reynolds MS,Smith DR,Urzhumov Ydoi
10.1038/srep03642subject
Has Abstractpub_date
2014-01-10 00:00:00pages
3642issn
2045-2322pii
srep03642journal_volume
4pub_type
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