Metamaterials for Improving Efficiency of Magnetic Resonant Wireless Power Transfer Applications

Thanh Son Pham; Thao Duy Nguyen; Dinh Lam Vu

doi:10.15625/0868-3166/16049

Author affiliations

Authors

Thanh Son Pham Vietnam Academy of Science and Technology
Thao Duy Nguyen Vietnam Academy of Science and Technology
Dinh Lam Vu Vietnam Academy of Science and Technology

DOI:

https://doi.org/10.15625/0868-3166/16049

Keywords:

metamaterial, magnetic resonant, wireless power transfer

Abstract

In this article, we investigate a compact metamaterial structure for enhancing a magnetic resonant wireless power transfer (WPT) system operated at 6.5 MHz. A thin magnetic metamaterial (MM) slab placed between the transmitter (Tx) and receiver (Rx) coil can improve WPT efficiency. The metamaterial unit cell is designed by a ten-turn spiral resonator (10T-SR) loaded with an external capacitor. The resonant frequency of MM unit cells can be easily controlled by changing the capacitor value. By using the optimization approach, we achieve a significant WPT efficiency improvement at a mid-range distance. The results showed an enhancement of the magnetic field in the WPT system when MM slab was present. This demonstrates the ability to amplify the evanescent wave of MM slab, thereby improving the WPT efficiency. The transmission coefficients of WPT system at 60 cm increased from 0.5 to 0.76 with MM slab, which corresponds to a 46% improvement.

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