Magnetic superlens-enhanced inductive coupling for wireless power transfer

Huang, Da; Urzhumov, Yaroslav; Smith, David R.; Teo, Koon Hoo; Zhang, Jinyun

doi:10.1063/1.3692757

Cited by 96 publications

(78 citation statements)

References 42 publications

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“…Techniques such as tuning the frequency of operation, employing impedancematching networks [16], [17], [18], transponder configurations [19], [20], coil arrays [21], and the use of a superlens to enhance coupling [22] have been explored. In [23], [24], [25], constant efficiencies were maintained by tuning a WNPT system's operating frequency while the transmit and receive resonators were strongly coupled.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis and Measurement of Frequency-Tuned and Impedance-Tuned Wireless Non-Radiative Power-Transfer Systems

Heebl

Thomas

Penno

et al. 2014

IEEE Antennas Propag. Mag.

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Abstract-This paper theoretically and experimentally investigates frequency-tuned and impedance-tuned wireless nonradiative power transfer (WNPT) systems. Closed-form expressions for the efficiencies of both systems, as a function of frequency and system (circuit) parameters, are presented. In the frequency-tuned system, the operating frequency is adjusted to compensate for changes in mutual inductance that occur for variations of transmitter and receiver loop positions. Frequencytuning is employed for a range of distances over which the loops are strongly coupled. In contrast, the impedance-tuned system employs varactor-based matching networks to compensate for changes in mutual inductance and achieve a simultaneous conjugate impedance match over a range of distances. The frequencytuned system is simpler to implement, while the impedance-tuned system is more complex but can achieve higher efficiencies. Both of the experimental WNPT systems studied employ resonant shielded loops as transmitting and receiving devices.

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Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis and Measurement of Frequency-Tuned and Impedance-Tuned Wireless Non-Radiative Power-Transfer Systems

Heebl

Thomas

Penno

et al. 2014

IEEE Antennas Propag. Mag.

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“…[2][3][4][5][6][7][8][9][10][11][12][13] In recent years, it has been shown that efficient mid-range wireless transfer can be achieved by utilizing near field magnetic coupling between two identical resonators. 2-5, 7, 9-13 Resonance frequency matching, resonance with high quality factors, and fast coupling rate are the keys to achieve high efficiency wireless power transfer.…”

Section: Introductionmentioning

confidence: 99%

Wireless power transfer in the presence of metallic plates: Experimental results

Skauli

Skauli³

et al. 2013

AIP Advances

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We demonstrate efficient wireless power transfer between two high Q resonators, especially in a complex electromagnetic environment. In the close proximity of metallic plates, the transfer efficiency stays roughly the same as the free space efficiency with proper designs. The experimental data fits well with a coupled theory model. Resonance frequency matching, alignment of the magnetic field, and impedance matching are shown to be the most important factors for efficient wireless power transfer

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“…Radiant WPT technology relies on the transfer of the electromagnetic waves, which could be widely applied in space transfer and satellite solar power station. Inductive coupling WPT is also an efficient technique brought into practice, but it can only be used as a short-distance WPT [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Efficient Wireless Power Transfer System Integrating With Highly Sub-Wavelength Metamaterials

Fan¹,

Li²,

Yu³

et al. 2013

PIER

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Abstract-In this paper, an efficient wireless power transfer (WPT) system integrating with highly sub-wavelength metamaterials is proposed.The negative refractive index (NRI) and negative permeability (MNG) metamaterials for operation at radio frequencies are designed and applied to WPT system for improvement of power transfer efficiency. A dual-layer design which consists of a planar spiral on one side and a meander line touching with narrow metallic strips on the other side produces the properties of effective negative permittivity and permeability simultaneously, i.e., negative refractive index. In addition, the structure of double spirals produces a negative permeability. The cell size of the NRI and MNG metamaterials is about 253 times smaller than the operation wavelength. By integrating one, two, three or four metamaterial slabs between the two coupling copper rings, the transfer efficiency is improved significantly. The measured results show that the contribution of high transfer efficiency is due to the property of negative permeability which can make the WPT system work in the mechanism of magnetic resonance.

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Magnetic superlens-enhanced inductive coupling for wireless power transfer

Cited by 96 publications

References 42 publications

Comprehensive Analysis and Measurement of Frequency-Tuned and Impedance-Tuned Wireless Non-Radiative Power-Transfer Systems

Comprehensive Analysis and Measurement of Frequency-Tuned and Impedance-Tuned Wireless Non-Radiative Power-Transfer Systems

Wireless power transfer in the presence of metallic plates: Experimental results

Experimental Study of Efficient Wireless Power Transfer System Integrating With Highly Sub-Wavelength Metamaterials

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