Magnetic metamaterials: Coupling and permeability

Radkovskaya, A.; Petrov, P.; Satskiy, A.; Ivanyukovich, M.; Вакуленко, А. А.; Прудников, В. В.; Kotel’nikova, O. A.; Korolev, A. F.; Zakharov, P. N.

doi:10.1016/j.jmmm.2017.11.031

Cited by 12 publications

(3 citation statements)

References 25 publications

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“…Magnetic metamaterial (MM) is a branch of metamaterials operating at the megahertz frequency range. That contributes to several critical industrial and academic applications [24][25][26]. MM work on the megahertz frequency range is applicable for mid-range WPT [27,28].…”

Section: Introductionmentioning

confidence: 99%

Metamaterials for Improving Efficiency of Magnetic Resonant Wireless Power Transfer Applications

Pham

Nguyen

2022

Comm. in Phys.

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In this article, we investigate a compact metamaterial structure for enhancing a magnetic resonant wireless power transfer (WPT) system operated at 6.5 MHz. A thin magnetic metamaterial (MM) slab placed between the transmitter (Tx) and receiver (Rx) coil can improve WPT efficiency. The metamaterial unit cell is designed by a ten-turn spiral resonator (10T-SR) loaded with an external capacitor. The resonant frequency of MM unit cells can be easily controlled by changing the capacitor value. By using the optimization approach, we achieve a significant WPT efficiency improvement at a mid-range distance. The results showed an enhancement of the magnetic field in the WPT system when MM slab was present. This demonstrates the ability to amplify the evanescent wave of MM slab, thereby improving the WPT efficiency. The transmission coefficients of WPT system at 60 cm increased from 0.5 to 0.76 with MM slab, which corresponds to a 46% improvement.

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Section: Introductionmentioning

confidence: 99%

Metamaterials for Improving Efficiency of Magnetic Resonant Wireless Power Transfer Applications

Pham

Nguyen

2022

Comm. in Phys.

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“…Depending on the signs of ε and μ values, the materials can be classified into four groups: double-positive, epsilon-negative, double-negative, and mu-negative materials [17]. In mu-negative material, only magnetic component is considered; therefore, it is also known as magnetic metamaterial (MM) [18]. Almost metamaterial structures operating at GHz and THz frequency ranges have both electric and magnetic responses [19,20].…”

Section: Introductionmentioning

confidence: 99%

Enhanced transmission efficiency of magneto-inductive wave propagating in non-homogeneous 2-D magnetic metamaterial array

Le¹,

Pham²,

Khuyen³

et al. 2022

Phys. Scr.

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In this work, we investigate the propagation of magneto-inductive waves (MIWs) in ordering magnetic metamaterial (MM) structures. The proposed non-homogeneous MM slab consists of 9 × 9 MM unit cells constructed from a five-turn spiral embedded on an FR-4 substrate. External capacitors with the value of 40 pF or 50 pF were added to control the resonant frequency of each unit cell in accordance with the waveguide configurations. The characteristics of metamaterial structures, such as negative permeability, current ratio, transmission response, and field distribution in the waveguide, have been thoroughly analyzed by simulation and experiment. Because of the strong magnetic field confinement in the waveguide, the transmittance after nine elements of the non-homogeneous MM slab is 5.2 times greater than that of the homogeneous MM slab. This structure can be applied to the planar near-field wireless power transfer, position sensor, and low-frequency communication.

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“…The coexistence of CPA and laser in a PT-symmetric system was first proposed by Longhi [48], in which an optic cavity was taken into consideration. It has been reported that optics can be a fertile ground where the PT-symmetry associated features may be fruitfully investigated [49], since optical metasurfaces may significantly provide the opportunities to engineer the electromagnetic waves, including the polarity [50], reflections [51], permitivities [52] and permeabilities [53]. In the optical regime shown in…”

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confidence: 99%

Recent advances in coherent perfect absorber-lasers and their future applications

Yang

Ye²,

Zhu³

et al. 2022

J. Cent. South Univ.

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In recent years, peculiar physical phenomena enabled by non-Hermitian systems, especially the parity-time (PT)-symmetric systems, have drawn tremendous research interests. Particularly, special spectral degeneracies known as exceptional points (EPs) and coherent perfect absorber-laser (CPAL) points where zero and infinite large eigenvalues coexist are the most popular topics to be studied. To date, the discussions of EPs that serve as transition boundaries between broken PT-symmetry phase and exact PT-symmetry phase have been intensively presented. However, the theoretical analysis and experimental validations of CPAL points are inadequate. Different from EPs, CPAL points, as a special solution of broken PT-symmetry phase, may exhibit even further counterintuitive physical features, which may have significant implications to study non-Hermitian physics. Here we review some recent advances of CPAL phenomena in different sub-disciplines of physics, including optics, electronics and electromagnetics, and acoustics.Additionally, we also provide an envision of future directions and applications of CPAL systems.

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Magnetic metamaterials: Coupling and permeability

Cited by 12 publications

References 25 publications

Metamaterials for Improving Efficiency of Magnetic Resonant Wireless Power Transfer Applications

Metamaterials for Improving Efficiency of Magnetic Resonant Wireless Power Transfer Applications

Enhanced transmission efficiency of magneto-inductive wave propagating in non-homogeneous 2-D magnetic metamaterial array

Recent advances in coherent perfect absorber-lasers and their future applications

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