Wave propagation control and switching for wireless power transfer using tunable 2-D magnetic metamaterials

Pham, Thanh Son; Bui, Huu Nguyen; Lee, Jong‐Wook

doi:10.1016/j.jmmm.2019.04.034

Cited by 20 publications

(12 citation statements)

References 36 publications

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“…The peak efficiency obtained in this configuration was 32.3%, which is three times greater than that of the original system. Due to the mutual coupling between unit cells on the metasurface, the peak of efficiency is slightly expanded compared with the original case [ 28 ]. When a cavity is created in the metasurface, the peak efficiency enhances significantly to 52%, as shown by the blue curve.…”

Section: Experiments Resultsmentioning

confidence: 99%

“…When the metamaterial is bent in a circular arc with radii from 200 mm to 80 mm, the resonant frequencies slightly change from 13.55 to 13.5 MHz. Because of interactions between the unit cells, a resonant frequency band is formed instead of the resonant peak in the metasurface spectrum [ 28 ]. Therefore, a slight change in the resonant frequency of the MM unit cell when subjected to bending does not significantly affect the performance of the metasurface.…”

Section: Design and Analysis Of Flexible Magnetic Metasurface For Wir...mentioning

confidence: 99%

“…Metamaterials and metadevices can be applied in various new technology fields, such as active microwave camouflage, antennas, absorbers, acoustics, and biosensors [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Studies on the use of magnetic metamaterials (MMs) to enhance WPT efficiency have been intensively carried out over the past decade and continue to be active now [ 27 , 28 ]. MM can be used to improve WPT systems’ performance in 2D and 3D profiles, as studied by Ranaweera et al [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

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Flexible Magnetic Metasurface with Defect Cavity for Wireless Power Transfer System

et al. 2022

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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.

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Section: Experiments Resultsmentioning

confidence: 99%

Section: Design and Analysis Of Flexible Magnetic Metasurface For Wir...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flexible Magnetic Metasurface with Defect Cavity for Wireless Power Transfer System

et al. 2022

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“…Although many points in the device have low efficiency due to the standing waves, the device has low cost and low complexity. Pham et al [78] proposed a 2D non-uniform metamaterial to control the surface wave propagation. Figure 13 illustrates the magnetic field distribution when the receiver at different positions.…”

Section: Misalignmentmentioning

confidence: 99%

“…The results illustrate that metamaterial can enhance the coupling coefficient of the lateral and angular misaligned in the WPT system. When the efficiency of the WPT system with metamaterial is larger than the WPT system with no FIGURE 13 Simulated magnetic flux density at different waveguides [78] metamaterial at a certain transfer distance d , it is called the threshold distance, d threshold . The corresponding results verify that the d threshold reduces as lateral misalignment increases.…”

Section: Misalignmentmentioning

confidence: 99%

Development and prospects of metamaterial in wireless power transfer

Huang

Zhang

Cong

et al. 2021

IET Power Electronics

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As a unique group of advanced artificial materials, metamaterials have found many interesting applications in various devices due to the ability to control electromagnetic fields. The metamaterial provides the prospect of new opportunities for the wireless power transfer (WPT) system to improve efficiency and reduce magnetic flux density. This review paper evaluates the performance of the WPT system with metamaterial from both principles and functions aspects. The objectives of this review include: (1) to present the research process and bottlenecks of metamaterial in the WPT system; (2) to clarify the design solution and checking method of the metamaterial and (3) to identify the challenges and opportunities based on the functional of the WPT system integration with metamaterial. Therefore, the process on metamaterial design, working principle of metamaterial, optimal method, equivalent model, and experimental method are reviewed. The recent efforts of the WPT system with metamaterial in efficiency enhancement, misalignments, magnetic field reduction are illustrated. Finally, the challenges and prospects of metamaterial based on the WPT system are concluded.

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A metamaterial‐incorporated wireless power transmission system for efficiency enhancement

Wang

Guo

Shi

et al. 2023

Circuit Theory & Apps

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Summary In this paper, an efficient wireless power transmission (WPT) system that incorporates a new negative permeability metamaterial is presented. The operating principle of the metamaterial with negative permeability is first analyzed. To improve transmission efficiency of the WPT system at the operating frequency of 13.56 MHz, a new metamaterial with three open rings is designed. By respectively placing a single metamaterial slab and double metamaterial slabs at different positions between transmitting coil and receiving coil, the performance of the proposed WPT system is evaluated by simulation work. The corresponding magnetic field distribution is also analyzed. Besides, comparison is made with the conventional WPT system without metamaterial. It is found that transmission efficiency of the proposed WPT system is obviously improved when incorporating the metamaterial since the designed metamaterial effectively focuses magnetic field towards the receiving coil. Comparing with the conventional system, the results also show that the proposed WPT system is more robust to lateral and angular misalignment of the receiving coil. With the designed metamaterial, it is found that the proposed system with double metamaterial slabs performs better than that with a single metamaterial slab.

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Wave propagation control and switching for wireless power transfer using tunable 2-D magnetic metamaterials

Cited by 20 publications

References 36 publications

Flexible Magnetic Metasurface with Defect Cavity for Wireless Power Transfer System

Flexible Magnetic Metasurface with Defect Cavity for Wireless Power Transfer System

Development and prospects of metamaterial in wireless power transfer

A metamaterial‐incorporated wireless power transmission system for efficiency enhancement

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