Magnetic Metamaterial Superlens for Increased Range Wireless Power Transfer

Lipworth, Guy; Ensworth, Joshua F.; Seetharam, Kushal; Huang, Da; Lee, Jae Seung; Schmalenberg, Paul; Nomura, Tsuyoshi; Reynolds, Matthew S.; Smith, David R.; Urzhumov, Yaroslav

doi:10.1038/srep03642

Cited by 159 publications

(105 citation statements)

References 23 publications

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“…Actually, magnetic metamaterials have been already proposed for increasing the magnetic coupling in wireless systems in the form of magnetic lenses. This strategy requires a negative permeability material, [29][30][31][32][33] whereas our metamaterial is made of non-resonant materials with positive permeability.…”

Section: -3mentioning

confidence: 99%

Experimental realization of magnetic energy concentration and transmission at a distance by metamaterials

Prat‐Camps

Navau

Sanchez

2014

Applied Physics Letters

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Concentrating magnetic energy in a desired volume is an important requirement for many technologies. Here, we experimentally realize a superconductor-ferromagnetic metamaterial that allows to concentrate the magnetostatic energy in its interior and in other situations to amplify the energy in its exterior. We show that surrounding two distant current loops with two such metamaterials enhance the magnetostatic coupling between them. We also demonstrate that a ferromagnetic-only metamaterial, without superconducting parts, achieves these properties with only a slight decrease in performance. Results may be applied to increase the sensitivity of magnetic sensors or for enhancing wireless power transmission, where efficiency depends critically on the magnetic coupling strength between source and receiver.

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Section: -3mentioning

confidence: 99%

Experimental realization of magnetic energy concentration and transmission at a distance by metamaterials

Prat‐Camps

Navau

Sanchez

2014

Applied Physics Letters

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“…Generally, the high efficiency enhancement of WPT can be obtained using bulky MMs such as three dimensional MM slabs [15,18]. Most reported MMs in the literatures [18,20,22,23] may be too thick and large in size for applications in some occasions. In our design, the proposed WPT system has the advantages of miniaturization and ultra-thin structure compared with most early publications.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…Therefore, we can use MMs to work at megahertz (MHz) band WPT systems. Recently, Urzhumov and Smith [17], Choi and Seo [18], Huang et al [19], Wang et al [20,21] and Lipworth et al [22] successively reported that efficient WPT systems can be achieved using MMs. In 2011, a theoretical analysis was presented by Urzhumov and Smith, which was about the possibility of using MM to enhance the mutual coupling between magnetic dipoles and thereby the efficiency of WPT system based on simplified assumptions [17].…”

Section: Introductionmentioning

confidence: 99%

Metamaterial-Based High-Efficiency Wireless Power Transfer System at 13.56 MHZ for Low Power Applications

Chen¹,

Zhixia²,

Hu³

et al. 2017

PIER B

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Abstract-Magnetically coupled resonant wireless power transfer (WPT) has been employed in many applications, including wireless charging of portable electronic devices, electric vehicles and powering of implanted biomedical devices. However, transmission efficiency decreases sharply due to divergence of magnetic field, especially in under coupled region. Electromagnetic (EM) metamaterial (MM) can manipulate the direction of EM fields due to its abnormal effective permittivity or permeability. In this paper, an ultra-thin and extremely sub-wavelength magnetic MM is designed for a 13.56 MHz WPT system to enhance magnetic field and its power transfer efficiency (PTE). The WPT systems are investigated theoretically, experimentally and by simulation. A relatively high maximum efficiency improvement of 41.7% is obtained, and the range of efficient power transfer can be greatly extended. The proposed MM structure is very compact and ultra-thin in size compared with early publications for some miniaturized applications. In addition, large area, homogeneous magnetic field is obtained and discussed using the proposed MM. Finally, the proposed MM is applied in a more practical WPT system (with a low power light bulb load) to reveal its effects. The bulb brightness intuitively verifies the efficiency improvement in the WPT system with the MM.

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“…The properties of MMs, especially evanescent wave amplification, are of interest to WPT because the resonant coupling is essentially coupling of near-field evanescent waves. Very recently, theoretical analysis [9][10][11][12][13][14] and experiments [15][16][17][18][19][20][21][22] on MM to enhance the evanescent near-field and eventually improve the PTE in WPT systems have been reported. In 2010, a three-dimensional (3D) MM with a relative permeability equal to −1 was proposed by Choi and Seo [15].…”

Section: Introductionmentioning

confidence: 99%

“…It is reported that this MM structure was used as a magnetic flux guide in order to enhance the efficiency of energy transmission between a source and distant receiving coil. Urzhumov and Smith presented a theoretical analysis on the possibility of using MMs to enhance the mutual coupling between magnetic dipoles and thereby the efficiency of WPT system based on simplified assumptions [9,11]. Wang et al [16] showed that MM could be utilized to enhance the evanescent-wave coupling for enhancing power transfer.…”

Section: Introductionmentioning

confidence: 99%

Application of Ultra-Thin Assembled Planar Metamaterial for Wireless Power Transfer System

Chen¹,

Hu²,

Wang³

et al. 2016

PIER C

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Abstract-Magnetically coupled resonant wireless power transfer (WPT) has been employed in many applications, including wireless charging of portable electronic devices, electric vehicles, etc. However, the power transfer efficiency (PTE) decreases sharply due to divergence of magnetic field. Electromagnetic (EM) metamaterial (MM) can control the direction of magnetic fields due to its negative effective permeability. In this paper, MMs with negative effective permeability at radio frequencies (RF) are applied to a WPT system operating at around 16.30 MHz for improvement of PTE. This ultra-thin and assembled planar MM structure consists of a single-sided periodic array of the capaci-tively loaded split ring resonators (CLSRRs). Both simulation and experiment are performed to cha-racterize the WPT system with and without MMs. The results indicate that the contribution of high PTE is due to the property of negative effective permeability. By integrating MM in the WPT system, the experimental results verify that the measured PTE with one and two MM slabs have respectively 10% and 17% improvement compared to the case without MM. The measured PTEs of the system at different transmission distances are also investigated. Finally, the proposed MM slabs are applied in a more practical WPT system (with a light bulb load) to reveal its effects. The results verify the efficiency improvement by the realized power being transferred to the load.

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Magnetic Metamaterial Superlens for Increased Range Wireless Power Transfer

Cited by 159 publications

References 23 publications

Experimental realization of magnetic energy concentration and transmission at a distance by metamaterials

Experimental realization of magnetic energy concentration and transmission at a distance by metamaterials

Metamaterial-Based High-Efficiency Wireless Power Transfer System at 13.56 MHZ for Low Power Applications

Application of Ultra-Thin Assembled Planar Metamaterial for Wireless Power Transfer System

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