An overview of metamaterials and their achievements in wireless power transfer

Sun, Kai; Zhang, Xihua; Zhang, Zidong; Shi, Zhicheng; Wang, Ning; Xie, Peitao; Wang, Zhongyang; Fan, Guohua; Liu, Hu; Liu, Chuntai; Li, Tingxi; Yan, Chao; Guo, Zhanhu

doi:10.1039/c7tc03384b

Cited by 181 publications

(77 citation statements)

References 150 publications

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“…Amazing possibilities in manipulation of electromagnetic fields with engineered dense distributions of scatterers (metamaterials) have been demonstrated in the last two decades [10][11][12][13]. Extensive research in the area of metasurfaces, thin two-dimensional metamaterials, established a rigorous theoretical approach to arbitrary control reflection and refraction of an incident planewave [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Constructing the Near field and Far field with Reactive Metagratings: Study on the Degrees of Freedom

2019

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In this paper, we report that metamaterials-inspired one-dimensional gratings (or metagratings) can be used to control nonpropagating diffraction orders as well as propagating ones. By accurately engineering the near-field it becomes possible to satisfy power conservation conditions and achieve perfect control over all propagating diffraction orders with passive and lossless metagratings. We show that each propagating diffraction order requires two degrees of freedom represented by passive and lossless loaded thin "wires". It provides a solution to the old problem of power management between diffraction orders created by a grating. The developed theory is verified by both 3D fullwave numerical simulations and experimental measurements, and can be readily applied to the design of wavefront manipulation devices over the entire electromagnetic spectrum as well as in different fields of physics.

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Section: Introductionmentioning

confidence: 99%

Constructing the Near field and Far field with Reactive Metagratings: Study on the Degrees of Freedom

2019

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“…Metamaterials, with unique negative electromagnetic parameters (e.g., negative refraction, permeability and permittivity), have gained extensive research attention due to their original applications in cloaking, waveguide, wireless power transfer, electromagnetic shielding and high-permittivity capacitor, etc. [1][2][3][4][5]. Metamaterials typically consist of artificially periodic array structure with different geometrical configuration (split-ring resonators, wires, fishnet, or cut-wire pairs) [1].…”

Section: Introductionmentioning

confidence: 99%

Targeted Double Negative Properties in Silver/Silica Random Metamaterials by Precise Control of Microstructures

et al. 2019

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Creative Commons Attribution License (CC BY 4.0).The mechanism of negative permittivity/permeability is still unclear in the random metamaterials, where the precise control of microstructure and electromagnetic properties is also a challenge due to its random characteristic. Here silver was introduced into porous SiO 2 microsphere matrix by a self-assemble and template method to construct the random metamaterials. The distribution of silver was restricted among the interstices of SiO 2 microspheres, which lead to the precise regulation of electrical percolation (from hoping to Drude-type conductivity) with increasing silver content. Negative permittivity came from the plasma-like behavior of silver network, and its value and frequency dispersion were further adjusted by Lorentz-type dielectric response. During this process, the frequency of epsilon-near-zero (ENZ) could be adjusted accordingly. Negative permeability was well explained by the magnetic response of eddy current in silver micronetwork. The calculation results indicated that negative permeability has a linear relation with 0.5 , showing a relaxation-type spectrum, different from the "magnetic plasma" of periodic metamaterials. Electromagnetic simulations demonstrated that negative permittivity materials and ENZ materials, with the advantage of enhanced absorption (40dB) and intelligent frequency selection even in a thin thickness (0.1 mm), could have potentials for electromagnetic attenuation and shielding. This work provides a clear physical image for the theoretical explanation of negative permittivity and negative permeability in random metamaterials, as well as a novel strategy to precisely control the microstructure of random metamaterials.

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“…Physical contact of the particles is not required for electrical conduction in composites . It was demonstrated that the electrical conductivity of the composites occurs not only by the inter‐particle contact, but also through electronic emission between the nearest filler particles which are separated by polymer layer by a distance larger than the inter‐particle contact or the distance for electron hopping.…”

Section: Introductionmentioning

confidence: 99%

A mathematical model for predicting conductivity of polymer composites with a forced assembly network obtained bySCFNAmethod

Kormakov

Huang

et al. 2018

Polymer Composites

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The Spatial Confining Forced Network Assembly, SCFNA, is a promising method for the preparation of high performance electrical conductive polymer composites, CPCs, by constructing a forced assembly conductive network in the polymer matrix. Because the present mathematical models for predicting electrical conductivities of CPCs were derived based on the free assembly of a conductive network, they were not suitable for predicting the electrical conductivities of the CPCs by SCFNA. A mathematical model for predicting the electrical conductivities of CPCs prepared by SCFNA was proposed in this article by introducing a compression ratio based on experimental data of the CPCs of PP/CF fabricated by SCFNA. The proposed model showed a good agreement with the experimental data of electrical conductivities prepared by SCFNA method. POLYM. COMPOS., 40:1819–1827, 2019. © 2018 Society of Plastics Engineers

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An overview of metamaterials and their achievements in wireless power transfer

Abstract: The schematic of metamaterials applied in wireless power transfer.

Cited by 181 publications

References 150 publications

Constructing the Near field and Far field with Reactive Metagratings: Study on the Degrees of Freedom

Constructing the Near field and Far field with Reactive Metagratings: Study on the Degrees of Freedom

Targeted Double Negative Properties in Silver/Silica Random Metamaterials by Precise Control of Microstructures

A mathematical model for predicting conductivity of polymer composites with a forced assembly network obtained bySCFNAmethod

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