Open AccessA wearable metasurface for high efficiency, free-positioning omnidirectional wireless power transfer
Author(s) -
Hanwei Wang,
Yunsheng Chen,
Yang Zhao
Publication year - 2021
Publication title -
new journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.584
H-Index - 190
ISSN - 1367-2630
DOI - 10.1088/1367-2630/ac304a
Subject(s) - wireless power transfer , omnidirectional antenna , physics , wireless , power (physics) , wearable computer , maximum power transfer theorem , orientation (vector space) , antenna (radio) , field (mathematics) , electrical engineering , electronic engineering , computer science , telecommunications , embedded system , engineering , geometry , mathematics , quantum mechanics , pure mathematics
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.