Abstract
In this paper, a metamaterial operating at 13.56 MHz is proposed for improving the efficiency of magnetic coupled resonance wireless power transfer (MCR-WPT) systems. By etching the structure of the metal spiral resonant ring on both sides of the dielectric substrate, the real part of the metamaterial unit's magnetic permeability at 13.56 MHz is −1, and the imaginary part is 0, realizing the properties of negative permeability metamaterials. In addition, an MCR-WPT system is designed to verify the efficiency-enhancing properties of negative magnetic metamaterials. The simulation results are consistent with the measured results. Both show that the meta material can significantly improve the efficiency of the wireless power transfer (WPT) system, and the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$S_{21}$</tex> value can be increased by about 15 dB.
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