International Journal of Advances in Electrical Engineering
2025, Vol. 6, Issue 2, Part A
Wireless power transfer enhancements via metamaterial-based resonators
Author(s): Antero Lehmusvirta, Kaisa Rannikko and Mikko Hietala
Abstract: Wireless Power Transfer (WPT) systems have gained remarkable attention as an emerging solution for contactless energy transmission across diverse applications, including consumer electronics, biomedical implants, and electric vehicle charging. However, conventional resonant inductive coupling methods are constrained by low efficiency over distance, high sensitivity to coil misalignment, and considerable electromagnetic field leakage. This study investigates the enhancement of WPT efficiency through the use of metamaterial-based resonators specifically negative-permeability, zero-permeability, and hybrid configurations designed to manipulate near-field electromagnetic flux and improve coupling strength. Experimental and simulation-based analyses were conducted using copper litz coils, Split-Ring Resonator (SRR) metamaterial slabs, and impedance-matched circuitry operating at 13.56 MHz. The results reveal that metamaterial integration significantly improves transfer efficiency by 20-50 % across coil separations of 20-100 mm, with hybrid slabs demonstrating superior stability under angular misalignments up to 30°. Moreover, the magnetic field leakage measured at 200 mm from the system was reduced by nearly 40 %, indicating enhanced electromagnetic compatibility. Statistical evaluation using one-way ANOVA confirmed the significance of metamaterial-induced improvements (p<0.001, η² > 0.9). The findings substantiate that metamaterial-assisted WPT systems can achieve both higher performance and improved safety metrics, offering scalable solutions for industrial automation, portable electronics, and biomedical power delivery. The study further proposes practical design recommendations emphasizing hybrid metamaterial structures, impedance-matching optimization, and adaptive resonator configurations for enhanced efficiency and robustness. Overall, the research provides a comprehensive framework for transitioning metamaterial-enhanced WPT systems from experimental prototypes to real-world technological implementations.
Pages: 46-51 | Views: 352 | Downloads: 158
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How to cite this article:
Antero Lehmusvirta, Kaisa Rannikko, Mikko Hietala. Wireless power transfer enhancements via metamaterial-based resonators. Int J Adv Electr Eng 2025;6(2):46-51.
