Enhanced efficiency of magnetic resonant wireless power transfer system using rollable and foldable metasurface based on polyimide substrate

• Published in: Applied physics. A, Materials science & processing Vol. 130; no. 7
• Main Authors: Hiep, Le Thi Hong, Bui, Huu Nguyen, Tung, Bui Son, Lam, Vu Dinh, Khuyen, Bui Xuan, Pham, Thanh Son
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.07.2024; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Configurations; Efficiency; Flexibility; Machines; Manufacturing; Metamaterials; Metasurfaces; Misalignment; Nanotechnology; Optical and Electronic Materials; Physics; Physics and Astronomy; Processes; Substrates; Surfaces and Interfaces; Thin Films; Wireless power transmission; Magnetic resonant wireless power transfer; Flexible metasurface; Magnetic resonant coupling; Magnetic metamaterials
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-024-07684-4

This paper proposes a rollable and foldable metamaterial structure that can improve the efficiency of a magnetic resonant wireless power transfer (MR-WPT) system operating at 13.56 MHz. The metasurface is fabricated on a thin polyimide substrate with a thickness of 0.1 mm and positioned between the transmitter and receiver coils of the MR-WPT system. This allows the metasurface to be fully flexible, making it possible to roll it around a cylindrical bar or fold it to follow the misalignment angle of the receiver. The rollable and foldable metasurface makes the configuration of the MR-WPT system more flexible and compact, thereby increasing its applicability. Detailed investigations of the proposed MR-WPT system were conducted through simulation and experiment. The efficiency of the MR-WPT system can be significantly improved from 30 to 50.5% when the full metasurface is used. The proposed metasurface can be rolled and disappear, making it useful in situations where the MR-WPT system configuration requires high flexibility. Additionally, a foldable metasurface can improve the transfer efficiency of misalignment MR-WPT systems from 8.8 to 28.1% in the case of a misalignment angle of 30 o . Overall, this work presents a promising solution for enhancing the efficiency of MR-WPT systems and increasing their flexibility.