一种基于双频超材料的无线电能传输系统

A Wireless Power Transfer System Based on Dual-band Metamaterials

在无线电能传输(WPT)系统中增加磁负超材料是一种提高传输效率的有效方法。针对传统磁负超材料介质板工作频点单一,无法适用于多频WPT的问题,此处分析讨论了磁负超材料提高WPT效率的机理,并设计了一种双频磁负超材料。仿真与实验结果表明:在WPT系统中加入双频磁负超材料板,传输距离为220 mm时,在6.78 MHz工作频点处,传输效率提高了23%,在13.56 MHz工作频点处,传输效率提高了17%。

Adding metamaterials to wireless power transmission(WPT)system is an effective method to improve transmission efficiency.In view of the single working frequency of the traditional negative metamaterials,they can not fit for multiple frequency system.We firstly discuss how the negative permeability metamaterials can improve WPT efficiency.Then,a kind of dual-band negative permeability metamaterials is designed.Finally,a WPT system is designed to verify the effectiveness of the dual-band matematerials.Both the simulation and the measured results show that when the transmission distance of adding the dual-band metamaterials plate into the WPT system is 220 mm.Maximum 23%efficiency improvement can be achieved at 6.78 MHz and maximum 17%efficiency improvement can be achieved at 13.56 MHz.