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Rollable metamaterial screen for magnetic resonance coupling-based high-efficiency wireless power transfer

Published online by Cambridge University Press:  09 September 2020

Woosol Lee Open the ORCID record for Woosol Lee [Opens in a new window]  and
Yong-Kyu Yoon
Woosol Lee
Affiliation:
Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL, USA
Yong-Kyu Yoon*
Affiliation:
Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL, USA
*
Author for correspondence: Yong-Kyu Yoon, E-mail: ykyoon@ece.ufl.edu
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Abstract

This paper presents a rollable metamaterial screen for high-efficiency wireless power transfer (WPT) system based on magnetic resonance coupling, which operates at 4.5 MHz. The rollable metamaterial screen with a fully expanded area of 750 mm × 750 mm is located in the middle between transmitter and receiver coils and focuses the magnetic field and, by such a way, significantly improves power transfer efficiency (PTE). The metamaterial screen can be rolled up, e.g. onto the ceiling when it is not used, and thus does not require any designated space for the screen saving space. A WPT system with the rollable metamaterial screen is designed, fabricated, and characterized. Improved PTE is qualitatively and quantitatively verified by light bulb experiments and vector network analyzer measurements. The PTE of the WPT system with the metamaterial screen increases from 36 to 58.52% and 10.24 to 31.36% for the distances between the transmitter and receiver coils 100 and 150 cm, respectively. The effects of lateral and angular misalignments on the PTE of the WPT system are also studied. Obtained results show that the rollable metamaterial screen improves the PTE even at the misaligned condition.

Keywords

Magnetic resonance coupling (MRC)power transfer efficiency (PTE)rollable metamaterial screenwireless power transfer
Type
Metamaterials and Photonic Bandgap Structures
Information
International Journal of Microwave and Wireless Technologies , Volume 13 , Issue 4 , May 2021 , pp. 365 - 373
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press in association with the European Microwave Association

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