A Wireless Power Transfer System Based on Dual-Band Metamaterials

Wireless power transfer (WPT) received widespread research in various field, such as wireless power in consumer electronics and electric vehicles. Recent researches have shown that adding metamaterials to the WPT system was an effective method to enhance transmission efficiency and distance. In view of the fact that traditional metamaterial slab often had a single working frequency point and was not suitable for multifrequency WPT, this letter analyzed and discussed the mechanism of magnetic negative metamaterial enhancing WPT efficiency. Moreover, two kinds of metamaterials, self-resonant dual-band negative permeability (SRDB-NPM) metamaterial and externally compensated dual-band negative permeability (ECDB-NPM) metamaterial, were designed. Finally, the effectiveness of two kinds of dual-band metamaterials to improve the efficiency at two different frequencies is verified by simulation and experiment.