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Omnidirectional non-radiative wireless power transfer with rotating magnetic field and efficiency improvement by metamaterial

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Abstract

In this paper, omnidirectional wireless power transfer (OWPT) via magnetic resonant coupling is proposed based on rotating magnetic field. In contrast to conventional WPT, the proposed wireless power transmitter consists of two orthogonal loops with 90° feeding phase difference. Both theoretical analyses and numerical simulations show that such transmitter generates rotating magnetic field and can provide wireless power to multiple receivers moving around it. In addition, a cylindrical metamaterial slab with negative permeability is used to improve the efficiency of the OWPT system, for the unique property of enhancing evanescent wave of metamaterials. It is shown that the efficiency of the OWPT can be improved to more than five times of that of the original one by the metamaterial slab.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 61371044), the Open Project Program of State Key Laboratory of Millimeter Wave (Grant Nos. K201403).

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Authors and Affiliations

  1. Department of Microwave Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Bang-Jun Che, Guo-Hui Yang, Fan-Yi Meng, Kuang Zhang, Jia-Hui Fu & Qun Wu

  2. The State Key Laboratory of Millimeter Waves, Nan**g, 210096, China

    Fan-Yi Meng

  3. Department of Electrical Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Li Sun

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  1. Bang-Jun Che
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  2. Guo-Hui Yang
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Correspondence to Fan-Yi Meng.

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Che, BJ., Yang, GH., Meng, FY. et al. Omnidirectional non-radiative wireless power transfer with rotating magnetic field and efficiency improvement by metamaterial. Appl. Phys. A 116, 1579–1586 (2014). https://doi.org/10.1007/s00339-014-8409-0

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  • DOI: https://doi.org/10.1007/s00339-014-8409-0

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