Dielectric response of perforated two-dimensional lossy heterostructures: A finite-element approach

Mejdoubi, Abdelilah; Brosseau, Christian

doi:10.1063/1.2359119

Cited by 31 publications

(13 citation statements)

References 64 publications

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“…It is clear that dielectric properties are associated with the extent of polarization in the composite. The surfaces and interfaces also play an active and vital role in a plethora of polarization mechanisms [22], [23]. Fe O -Ti composites with a large amount of cuboidal-, spherical-, and irregular-shaped particles possess higher heterogeneity, which might cause more disordered motion of charge carriers, results in interfacial polarization.…”

Section: A Em Parameter Measurement Of Developed Heterogeneous Compomentioning

confidence: 99%

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Fractal Frequency-Selective Surface Embedded Thin Broadband Microwave Absorber Coatings Using Heterogeneous Composites

Panwar

Puthucheri

Agarwala

et al. 2015

IEEE Trans. Microwave Theory Techn.

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The development of thin microwave absorber coatings that operates for a wide range of frequencies is still a challenging task. This work presents a technique of blending a fractal frequency selective surface (FSS) with single-and double-layer coatings. These coatings are comprised of well-optimized micrometer-sized (80-90 m) and nano-sized (20-30 nm) Ti particles based Fe O (80-100 nm) composites. The main objective of this study is to achieve good absorption with wide bandwidth corresponding to reflection loss (RL) dB for less coating thickness ( 1.5 mm). Waveguide measurements are carried out to obtain the effective complex dielectric permittivity ( ) and effective complex magnetic permeability ( ) values of Fe O -Ti based heterogeneous composites. The measured , , , and values are used for the designing of double-layer composite absorbers, where the suitable composite selection, layer preferences, as well as thickness of layers are optimized using a genetic algorithm. The fractal geometry based FSSs have been designed using an iterated function system, which are embedded with single-and double-layer composite absorbers to examine their effect on absorption. A double-layer composite coating with a Sierpinski gasket fractal FSS shows a strong RL of 35.57 dB at 9.5 GHz with broad bandwidth of 4.2 GHz in the range from 8.2 to 12.4 GHz. The total coating thickness is only 1.4 mm. Findings provide an effective and feasible way to develop thin and broadband absorber coatings for various practical applications. Index Terms-Composite materials, fractals, frequency-selective surfaces (FSSs), microwave absorbing materials (MAMs).

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Section: A Em Parameter Measurement Of Developed Heterogeneous Compomentioning

confidence: 99%

“…The microwave absorption depends on the material's internal structure, composition, particle size, and shape [1], [6], [23], [30], [31], [33]. Therefore, considering a fractal FSS embedded Fe O -Ti composite 0018-9480 © 2015 IEEE.…”

Section: Introductionmentioning

confidence: 99%

Fractal Frequency-Selective Surface Embedded Thin Broadband Microwave Absorber Coatings Using Heterogeneous Composites

Panwar

Puthucheri

Agarwala

et al. 2015

IEEE Trans. Microwave Theory Techn.

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“…In the recent decade there has been a considerable effort devoted to the investigation of electromagnetic properties of similar structures, including: metasurfaces formed by planar arrays of spherical particles 19 , lossless magneto-dielectric spheres embedded in a background matrix 20,21 , as well as two-dimensional lossy heterostructures 22 . In most of the cases the investigations involved modelling based on the earlier work of Lewin 23 for sparse arrays of spherical particles.…”

Section: Introductionmentioning

confidence: 99%

Fully carbon metasurface: Absorbing coating in microwaves

Bychanok

Gorokhov

et al. 2017

Journal of Applied Physics

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The microwave-absorbing properties of a heterostructure consisting of an ordered monolayer of porous glassy carbon spheres were experimentally and theoretically investigated in the Ka-band (26-37 GHz) frequency range. The electromagnetic response of such "moth-eye"-like all-carbon metasurface at a normal incidence angle was modelled on the basis of long-wave approximation. Modelling parameters in the Ka-band were used to estimate and predict the absorption properties of monolayers in free space in the range 1-40 GHz. Experimental and theoretical results demonstrate that a metasurface based on porous glassy carbon spheres is an inert, lightweight, compact and perfectly absorbing material for designing new effective microwave absorbers in various practically used frequency ranges.

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“…Conventional partial difference equation ͑PDE͒ solvers, such as the finite difference method ͑FDM͒, [36][37][38][39] finite element method ͑FEM͒, [40][41][42][43] and boundary element method ͑BEM͒, 44,45 have been applied to tackle the governing equations of electric potential transports in porous media or binary mixtures. However, the structural complexities bring in two challenges when the governing equations are to be solved by conventional PDE solvers.…”

Section: Introductionmentioning

confidence: 99%

Numerical analyses of effective dielectric constant of multiphase microporous media

Wang

Pan

2007

Journal of Applied Physics

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This paper provides a full numerical tool set for modeling and predicting an effective apparent dielectric constant of multiphase microporous media, which includes a multiparameter random generation-growth algorithm for generating microstructures of multiphase porous media and a lattice Boltzmann solver for the electric potential transport equations through porous structures. After being validated by the theoretical solutions for simple geometries, the present methods are used to investigate the phase distribution effects on the effective dielectric constant of multiphase microporous media, including the effects of particle size, structure anisotropy, and phase aggregation caused by wetting characteristics between phases for multiphase cases. The resultant predictions at the end agree well with the existing experimental data for both two-phase and three-phase cases.

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Dielectric response of perforated two-dimensional lossy heterostructures: A finite-element approach

Abstract: Finite-element modeling method for the prediction of the complex effective permittivity of two-phase random statistically isotropic heterostructures J. Appl. Phys. 97, 044101 (2005); 10.1063/1.1835544Modeling dielectric properties of composites by finite-element method

Cited by 31 publications

References 64 publications

Fractal Frequency-Selective Surface Embedded Thin Broadband Microwave Absorber Coatings Using Heterogeneous Composites

Fractal Frequency-Selective Surface Embedded Thin Broadband Microwave Absorber Coatings Using Heterogeneous Composites

Fully carbon metasurface: Absorbing coating in microwaves

Numerical analyses of effective dielectric constant of multiphase microporous media

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