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Experimental and Numerical Investigation of Termination Impedance Effects in Wireless Power Transfer via Metamaterial

Department of Electrical, Electronic, and Information Engineering "Guglielmo Marconi"—DEI, University of Bologna, Viale Risorgimento 2, I-40136 Bologna, Italy
Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
Author to whom correspondence should be addressed.
Academic Editor: K. T. Chau
Energies 2015, 8(3), 1882-1895;
Received: 8 December 2014 / Revised: 16 February 2015 / Accepted: 26 February 2015 / Published: 9 March 2015
(This article belongs to the Special Issue Wireless Power Transfer)
PDF [16671 KB, uploaded 17 March 2015]


This paper presents an investigation of the transmitted power in a wireless power transfer system that employs a metamaterial. Metamaterials are a good means to transfer power wirelessly, as they are composed of multiple inductively-coupled resonators. The system can be designed and matched simply through magneto-inductive wave theory, particularly when the receiver inductor is located at the end of the metamaterial line. However, the power distribution changes significantly in terms of transmitted power, efficiency and frequency if the receiver inductor slides along the line. In this paper, the power distribution and transfer efficiency are analysed, studying the effects of a termination impedance in the last cell of the metamaterial and improving the system performance for the resonant frequency and for any position of the receiver inductor. Furthermore, a numerical characterisation is presented in order to support experimental tests and to predict the performance of a metamaterial composed of spiral inductor cells with very good accuracy. View Full-Text
Keywords: wireless power transfer; metamaterial; magneto-inductive waves; resonator wireless power transfer; metamaterial; magneto-inductive waves; resonator
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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MDPI and ACS Style

Puccetti, G.; Stevens, C.J.; Reggiani, U.; Sandrolini, L. Experimental and Numerical Investigation of Termination Impedance Effects in Wireless Power Transfer via Metamaterial. Energies 2015, 8, 1882-1895.

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