IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
High-efficiency wireless power transfer by optimal load and metamaterial slab
Nam Ha-VanNinh Dang-DuyHyoungjun KimChulhun Seo
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2017 Volume 14 Issue 14 Pages 20170320


In this letter, a two-coil wireless power transfer system is analyzed mathematically to obtain optimal source and load impedances, which are the most important factors that affect system efficiency. In addition, a near-zero refractive index metamaterial slab with a negative permeability was inserted between two resonant coils close to the transmitter to improve the efficiency in a large range. Finally, the wireless energy transfer system with the metamaterial slab was designed, fabricated and measured to evaluate the analysis method. The power transfer efficiency of 73.1% with the optimal impedances was enhanced to 81.3% using a 5 × 5 array metamaterial slab at the frequency of 13.56 MHz and the distance of 20 cm between the transmitter and the receiver.

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© 2017 by The Institute of Electronics, Information and Communication Engineers
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