Metasurface-Loaded Magnetic Small Antennas on a MWPT System

This work proposes a resonant metamaterial structure coupled to a small loop for increasing efficiency in a magnetic wireless power transfer (MWPT) system. A circuit model of the metamaterial arrangement and the methodology for evaluating the system efficiency are presented. The results demonstrate that, with the use of the metasurface, the quality factor of the loops was improved by 2 times, leading to a remarkable increase in the MWPT efficiency 10 times in comparison with a loop loaded for a lumped capacitor and a loop loaded for a metasurface. These results underscore the performance enhancement for electrically small magnetic WPT systems with the novel strategy proposed in this paper, suggesting that its application can provide substantial gains in small magnetic wireless power transfer systems.