Wireless Power Transfer via Strongly Coupled Magnetic Resonances

Kurs, André; Karalis, Aristeidis; Moffatt, Robert M.; Joannopoulos, John D.; Fisher, P. H.; Soljačić, Marin

doi:10.1126/science.1143254

Cited by 4,579 publications

(2,457 citation statements)

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“…The rapidly growing metamaterials research is driven by a number of potential applications of metamaterials. At the early stage of metamaterials research, besides magnetic resonance imaging, novel microwave circuits, and antennas at microwave region, [23][24][25] perfect lens with imaging resolution beyond the iffraction limit is one of the most attractive devices. 26,27 In conventional optical systems, we cannot resolve two points separated less than l/2n, where n is the refractive index of the ambient medium.…”

Section: Negative Index Metamaterials and Applications Of Metamaterialsmentioning

confidence: 99%

Metamaterials: a new frontier of science and technology

Liu¹,

2011

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Metamaterials, artificial composite structures with exotic material properties, have emerged as a new frontier of science involving physics, material science, engineering and chemistry. This critical review focuses on the fundamentals, recent progresses and future directions in the research of electromagnetic metamaterials. An introduction to metamaterials followed by a detailed elaboration on how to design unprecedented electromagnetic properties of metamaterials is presented. A number of intriguing phenomena and applications associated with metamaterials are discussed, including negative refraction, sub-diffraction-limited imaging, strong optical activities in chiral metamaterials, interaction of meta-atoms and transformation optics. Finally, we offer an outlook on future directions of metamaterials research including but not limited to three-dimensional optical metamaterials, nonlinear metamaterials and ''quantum'' perspectives of metamaterials (142 references).

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Section: Negative Index Metamaterials and Applications Of Metamaterialsmentioning

confidence: 99%

Metamaterials: a new frontier of science and technology

Liu¹,

2011

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“…Since a research team at the Massachusetts Institute of Technology (MIT) proposed the creation of the wireless power transfer (WPT) technique using the magnetically coupled high resonance (HR) phenomenon [1], the technique has gradually been receiving greater attention. The WPT technique is expected to be useful for various applications such as cellular phones, laptop computers, home electrical appliances, and electric vehicles [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Misaligned Effect and Exposure Assessment for Wireless Power Transfer System Using the Anatomical Whole-Body Human Model

Park

2017

PIER C

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Abstract-This paper presents dosimetry of a high resonance wireless power transfer (HR-WPT) system when the transmitter and receiver are aligned and misaligned. An HR-WPT system with two resonant coils and two feeding loops, operating at 13.56 MHz is designed. The power transfer efficiency of the system, and the electric and magnetic fields are investigated using the method of moments. The power transfer efficiency in misalignment situations can be increased by matching the HR-WPT system. Dosimetry of the HR-WPT system is conducted at the optimum matching condition for alignment and misalignment, to achieve the best power transfer efficiency. The specific absorption rate (SAR) is computed using a two-step approach. In the first step, the magnetic fields generated by the HR-WPT system in the absence of a whole-body voxel human model are calculated using the method of moments. In the second step, the SAR in the human model is calculated using the impedance method, with the magnetic fields computed in the previous step regarded as the magnetic fields incident to the human body. Five exposure scenarios are set: one alignment condition and four misalignment conditions. The SAR computed for the alignment and misalignment cases in the matching condition are compared to each other. The compliance of the system is also investigated using the international safety guidelines. Finally, the maximum allowable powers to comply with the guideline are investigated for the five cases considered. The results show that the SARs observed in the misalignment case are higher than those in the alignment case. These results suggest that the misalignment situation should be considered in addition to alignment, when conducting dosimetry of the HR-WPT system.

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“…In 2006 Prof. Marin Soljačić and his research team in MIT proposed the mid-range WPT technology based on magnetic coupling resonance in the AIP forum in the United States [22], and the theory was tested in 2007 with great success, transmitting 60 watts across 2 meters with 40 percent efficiency [23]. This technology opens up a new research direction for mid-range WPT with the advantages of high transmission efficiency, long distance and large transmission power and attracted researchers' attention immediately.…”

Section: Introductionmentioning

confidence: 99%

“…As an important part of the transmission system, the resonant-driven device has a significant impact on overall performance of WPT system. Authors in the literature [23] used colpitts oscillator as driving source, but the driving device has a large power loss and low transmission efficiency for its linear amplification working mode. In the study of literature [24][25][26], class E power amplifier was used to effectively improve the efficiency of driving source, but the relationship between transmission efficiency, driving signal and transmission distance was not introduced.…”

Section: Introductionmentioning

confidence: 99%