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Enhanced Efficiency of Asymmetric Wireless Power Transmission Using Defects in 2D Magnetic Metamaterials
Journal of Electronic Materials ( IF 2.1 ) Pub Date : 2020-11-09 , DOI: 10.1007/s11664-020-08586-w
Thanh Son Pham , Bui Xuan Khuyen , Bui Son Tung , Thu Trang Hoang , Van Dai Pham , Quang Minh Ngo , Vu Dinh Lam

In this work, we investigate an asymmetric wireless power transfer (WPT) system constructed by a big transmitter (Tx) and a small receiver (Rx) operated at 13.56 MHz. Because of the high radius ratio between Tx and Rx coils, the efficiency of asymmetric WPT is lower than the symmetric one. Therefore, a compact metasurface placed between the Tx and Rx is used to enhance the efficiency of WPT. To further improve efficiency, we create a nonuniform metasurface by controlling the resonant frequency of the unit cells. This defect with higher resonant frequency than others is easily formed by tuning the external capacitor. This modified metasurface can strongly localize the magnetic field into the defect region at a deep subwavelength scale of 2.3λ × 10−3and is, therefore, suitable for coupling to the small Rx of asymmetric WPT. There is an optimum position of metasurface for achieving the highest efficiency when the couplings between the defect, Tx, and Rx coils are appropriate. By using the optimization approach, the efficiency of the WPT increases significantly from 9.8% to 60.2% with a nonuniform metasurface. The performances of WPT at various locations of defect and receiver are also considered.



中文翻译:

利用二维磁性超材料中的缺陷提高非对称无线电力传输的效率

在这项工作中,我们研究了由工作在13.56 MHz的大发射器(Tx)和小接收器(Rx)构成的非对称无线电力传输(WPT)系统。由于Tx和Rx线圈之间的半径比很高,因此非对称WPT的效率低于对称WPT的效率。因此,在Tx和Rx之间放置了一个紧凑的超表面,以提高WPT的效率。为了进一步提高效率,我们通过控制晶胞的共振频率来创建不均匀的超表面。通过调谐外部电容器很容易形成这种谐振频率高于其他谐振频率的缺陷。该修改超颖表面可强烈本地化磁场到缺陷区域以2.3的深次波长尺度λ  ×10 -3因此,它适合耦合到不对称WPT的小Rx。当缺陷,Tx和Rx线圈之间的耦合适当时,存在一个最佳的亚表面位置,以实现最高效率。通过使用优化方法,在表面不均匀的情况下,WPT的效率从9.8%显着提高到60.2%。还考虑了WPT在缺陷和接收者的各个位置的性能。

更新日期:2020-11-12
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