2014年1月
Magnetic Metamaterial Superlens for Increased Range Wireless Power Transfer
SCIENTIFIC REPORTS
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- 巻
- 4
- 号
- 開始ページ
- 3642
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/srep03642
- 出版者・発行元
- NATURE PUBLISHING GROUP
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.
- リンク情報
- ID情報
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- DOI : 10.1038/srep03642
- ISSN : 2045-2322
- PubMed ID : 24407490
- Web of Science ID : WOS:000329841700002