A wearable metasurface for high efficiency, free-positioning omnidirectional wireless power transfer. (13th December 2021)

• Record Type: Journal Article
• Authors: Wang, Hanwei; Chen, Yun-Sheng; Zhao, Yang
• Is Part Of: New journal of physics. Volume 23:Number 12(2021)
• Publication Date: 2021-12-13
• Subjects: wearable -- reconfigurable metasurfaces -- wireless power transfer -- magnetic field -- coupled-mode theory -- free-positioning -- omnidirectional; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/ac304a
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: We introduce a design principle of metasurfaces that can form any desired distribution of magnetic field for high-efficiency wireless power transfer centered at 200 kHz, which can be used to efficiently charge implanted medical devices. This metasurface can improve the power transfer efficiency for both single-user and multi-user cases by over tenfold compared to those without the metasurface. Our design enables a robust field distribution to the positions of the transmitting and receiving coils, as well as the geometric distortions of the metasurface itself, demonstrating its feasibility as a wearable device. With our design, the field distribution and subsequent power division among the multiple users can be readily controlled from equal distribution to any selective user(s). When incorporating a three-dimensional unit cell of the metasurface, we theoretically demonstrate an omnidirectional control of the field orientation to achieve a high-efficiency wireless power transfer for multiple users.