A wearable metasurface for high efficiency, free-positioning omnidirectional wireless power transfer

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...

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Bibliographic Details
Published in:New journal of physics 2021-12, Vol.23 (12), p.125003
Main Authors: Wang, Hanwei, Chen, Yun-Sheng, Zhao, Yang
Format: Article
Language:English
Subjects:
coupled-mode theory
Efficiency
Electric power distribution
free-positioning
magnetic field
Metasurfaces
omnidirectional
Physics
Power transfer
reconfigurable metasurfaces
Unit cell
wearable
Wearable technology
wireless power transfer
Wireless power transmission
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Summary: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 feasibilities 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.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/ac304a