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. 2022 Sep 22;15(19):6583.
doi: 10.3390/ma15196583.

Flexible Magnetic Metasurface with Defect Cavity for Wireless Power Transfer System

Le Thi Hong Hiep  1   2   3 , Bui Xuan Khuyen  1 , Bui Son Tung  1 , Quang Minh Ngo  4 , Vu Dinh Lam  2 , Thanh Son Pham  1   2
Affiliations

Flexible Magnetic Metasurface with Defect Cavity for Wireless Power Transfer System

Le Thi Hong Hiep et al. Materials (Basel). .

Abstract

In this paper, we present a flexible magnetic metamaterial structure for enhancing the efficiency of wireless power transfer (WPT) systems operating at 13.56 MHz. The metasurface between transmitter (Tx) and receiver (Rx) coils of the WPT system is constructed of a 3 × 5 metamaterial unit cell array with a total size of 150 × 300 mm2. Most metamaterial structures integrated into WPT systems are in planar configurations with a rigid substrate, which limits practical applications. The proposed metasurface is fabricated on an FR-4 substrate with a thin thickness of 0.2 mm; therefore, it can be bent with radii greater than 80 mm. A defect cavity is formed in the non-homogeneous metasurface by controlling the resonant frequency of the unit cell with an external capacitor. Simulation and measurement results show that the efficiency of the WPT system is significantly enhanced with metasurfaces. The performance of the WPT system can also be optimized with suitable bend profiles of metasurfaces. This proposed flexible metasurface could be widely applied to WPT systems, especially asymmetric, bendable, or wearable WPT systems.

Keywords: coupling resonance; magnetic metamaterial; magnetic resonance wireless power transfer; metasurface.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Schematic of the WPT system with a flexible metasurface.
Figure 2
Figure 2
(a) Design of MM unit cell, (b) equivalent electrical model of MM unit cell.
Figure 3
Figure 3
(a) Schematic of bending metasurface, (b) the resonant frequency of MM unit cell following bending radius.
Figure 4
Figure 4
Field distributions in WPT systems (a) with a homogeneous metasurface and (b) with a non-homogeneous metasurface.
Figure 5
Figure 5
Field distributions in a WPT system with flexible metasurface (a) with a homogeneous metasurface and (b) with a non-homogeneous metasurface. Field distributions on metasurface (c) with a homogeneous metasurface and (d) with a non-homogeneous metasurface.
Figure 6
Figure 6
Experiment setup for the proposed WPT system with flexible metasurface.
Figure 7
Figure 7
Measured efficiencies of WPT system with and without metasurface.
Figure 8
Figure 8
Measured efficiencies of WPT system as a function of frequency with various bending radii of (a) homogeneous metasurface and (b) non-homogeneous metasurface.
See this image and copyright information in PMC

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