Investigation of Negative and Near-Zero Permeability Metamaterials for Increased Efficiency and Reduced Electromagnetic Field Leakage in a Wireless Power Transfer System

Lu, Conghui; Chen, Rong; Huang, Xiutao; Hu, Zhenzhong; Xiong, Tingting; Wang, Sheng-Ming; Chen, Junfeng; Liu, Minghai

doi:10.1109/temc.2018.2865520

Cited by 64 publications

(35 citation statements)

References 41 publications

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“… b The calculation method of magnetic field attenuation is different from that in this paper. Besides, two types of MMs are analysed individually in [24]. …”

Section: Analysis Of the Proposed Wpt System With Mnz‐mmmentioning

confidence: 99%

“…In [11–25], it has been shown that the transfer efficiency can be improved greatly and the EMF leakage can be cancelled largely by adopting the metamaterials (MMs). The MMs are artificial composite materials and have exhibited numerous anomalous electromagnetic properties, such as the arbitrary effective permeability or permittivity, negative refractive index and evanescent wave amplification.…”

Section: Introductionmentioning

confidence: 99%

“…At present, the studies on the MNZ‐MM in the WPT systems are insufficient. Fresnel transmission and reflection formulas are used to explain the shielding principle of the MNZ‐MM generally [23, 24]. This method also requires complex calculation and a large number of simulations.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Equivalent circuit method for Mu‐Negative‐Magnetic and Mu‐Near‐Zero metamaterials in wireless power transfer system

Chen

Xiong

et al. 2020

IET power electron.

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“… b The calculation method of magnetic field attenuation is different from that in this paper. Besides, two types of MMs are analysed individually in [24]. …”

Section: Analysis Of the Proposed Wpt System With Mnz‐mmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Equivalent circuit method for Mu‐Negative‐Magnetic and Mu‐Near‐Zero metamaterials in wireless power transfer system

Chen

Xiong

et al. 2020

IET power electron.

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“…However, the EMF leakage of the system was not discussed or studied. Currently, most papers have studied the properties of the evanescent wave amplification of negative-permeability metamaterial (NPM), which can increase the system efficiency and alleviate the coil offset [12]- [15]. However, most studies are devoted to studying the NPM located between the transmitter and receiver.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis of Side-Placed Metamaterials in Wireless Power Transfer System

Huang

Xiong

et al. 2020

IEEE Access

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In this paper, we propose the side-placed negative-permeability metamaterial (NPM) and zero-permeability metamaterial (ZPM) in the wireless power transfer (WPT) system to simultaneously enhance the level of efficiency and meet the electromagnetic field (EMF) safety regulations. A theoretical analysis, simulation, and experiment are conducted to verify the feasibility of the proposed system model. Based on the principle of magneto-inductive waves (MIWs) and the shielding theory, the transmission characteristics of the WPT system without and with two NPM slabs, two ZPM slabs, and the combination of NPM and ZPM slabs are analyzed. The results demonstrate that the ZPM slabs and the combination of NPM and ZPM slabs have a high efficiency improvement when the transfer distance is located under 40 cm and exceeds 40 cm, respectively. Both methods can control the EMF leakage. Moreover, the side-placed metamaterial exhibits tolerance to the misalignment of the coil. Finally, comparative studies on the ZPM slab and aluminum are carried out. The experimental and simulation results show that the ZPM slab performs better than aluminum.INDEX TERMS Zero-permeability, negative-permeability, combination, increase efficiency, shield magnetic field, MIW, wireless power transfer (WPT).

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“…Electromagnetic metamaterials have strong magnetic field control capabilities [ 17 , 18 ]. Many studies have shown that electromagnetic metamaterials can enhance the resonant coil coupling of WPTs and solve the electromagnetic leakage problem [ 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Stability of Medium Range and Misalignment Wireless Power Transfer System by Negative Magnetic Metamaterials

et al. 2020

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The misalignment of the resonant coils in wireless power transfer (WPT) systems causes a sharp decrease in transfer efficiency. This paper presents a method which improves the misalignment tolerance of WPT systems. Based on electromagnetic simulations, the structural unit parameters of the electromagnetic material were extracted, and an experimental prototype of a four-coil WPT system was built. The influence of electromagnetic metamaterials on the WPT system under the conditions of lateral misalignment and angular offset was investigated. Experiments showed that the transfer efficiency of the system could be maintained above 45% when the transfer distance of the WPT system with electromagnetic metamaterials was 1 m and the resonant coils were shifted laterally within one coil diameter. Furthermore, the system transfer efficiency could be stabilized by more than 40% within an angle variation range of 70 degrees. Under the same conditions, the transfer efficiency of a system without electromagnetic metamaterials was as low as 30% when lateral migration occurred, and less than 25% when the angle changed. This comparison shows that the stability of the WPT system loaded with electromagnetic metamaterials was significantly enhanced.

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Investigation of Negative and Near-Zero Permeability Metamaterials for Increased Efficiency and Reduced Electromagnetic Field Leakage in a Wireless Power Transfer System

Cited by 64 publications

References 41 publications

Equivalent circuit method for Mu‐Negative‐Magnetic and Mu‐Near‐Zero metamaterials in wireless power transfer system

Equivalent circuit method for Mu‐Negative‐Magnetic and Mu‐Near‐Zero metamaterials in wireless power transfer system

Comprehensive Analysis of Side-Placed Metamaterials in Wireless Power Transfer System

Enhancing the Stability of Medium Range and Misalignment Wireless Power Transfer System by Negative Magnetic Metamaterials

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