Equivalent modeling of the microwave dielectric properties for fiber reinforced shielding composites

Liao, Yi; Shi, Guochang; Yuan, Liming; Ying, Xiaojun

doi:10.1109/apemc.2016.7522938

Cited by 3 publications

(11 citation statements)

References 6 publications

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“…Thus, as expressed in subsection 2.1, DHM should improve the prediction of SE for high frequency band range. The procedure provided in [4] leads to α = (d/λ) γ (see equation (3 and part 2.1) with γ ≈ 2 = 1.92 similarly to what was proposed for cylindrical fibers [17]. It is to be noted that d stands for the radius of inclusions (here d = 0.100 mm is the diameter of spheres).…”

Section: Optimized Homogenization Procedures Based Upon 3-d Se Statisticsmentioning

confidence: 71%

“…where α stands for weight coefficient depending on the typical size d of inclusions (for instance the diameter of cylindrical fibers [4,17], and/or the diameter of spherical inclusions here). Relying on previous assumptions, dynamic homogenization method (DHM) was successfully used in [4] by defining α = (d/λ) 2 , where λ represents the wavelength of the excitation source in effective medium.…”

Section: Theoretical Foundationsmentioning

confidence: 99%

“…taking into account size of 2-D circular conductive inclusions jointly with skin effect as it was the case in [10]) with EMC expectations in [4]. Based upon previous reference, some interesting works were recently proposed in [17], reproducing 2-D results with 3-D frequency solver (FEKO EM simulation tool [19]): the authors extended numerical modeling of the semi-infinite cylindrical fibers in 3-D with periodical boundary conditions, and provided original assumptions for the validity of DHM [4] in EMC context. Antennas and propagation (AP) community has also shown a growing interest for the development of 3-D numerical tools aiming at computing the effective properties (i.e.…”

Section: State-of-the-artmentioning

confidence: 99%

“…It is to be noted here that the choice of the elementary composite cell (i.e. 1 × 1 × 6 mm 3 parallelepiped) was governed by the works proposed in [4,12,13,17] with similar materials and comparable micro-structures.…”

Section: Numerical Setup and Se Extractionmentioning

confidence: 99%

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Optimized 3-D electromagnetic models of composite materials in microwave frequency range: application to EMC characterization of complex media by statistical means

Lalléchère¹

2017

AEM

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The aim of this proposal is to demonstrate the ability of tridimensional (3-D) electromagnetic modeling tool for the characterization of composite materials in microwave frequency band range. Indeed, an automated procedure is proposed to generate random materials, proceed to 3-D simulations, and compute shielding effectiveness (SE) statistics with finite integration technique (FIT, CST microwave studio solver). In this context, 3-D electromagnetic models rely on random locations of conductive inclusions; results are compared with classical electromagnetic mixing theory (EMT) approaches (e.g. Maxwell-Garnett formalism), and dynamic homogenization model (DHM).The article aims to demonstrate the interest of the proposed approach in various domains such as propagation and electromagnetic compatibility (EMC).

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Section: Optimized Homogenization Procedures Based Upon 3-d Se Statisticsmentioning

confidence: 71%

Section: Theoretical Foundationsmentioning

confidence: 99%

Section: State-of-the-artmentioning

confidence: 99%

Section: Numerical Setup and Se Extractionmentioning

confidence: 99%

See 2 more Smart Citations

Optimized 3-D electromagnetic models of composite materials in microwave frequency range: application to EMC characterization of complex media by statistical means

Lalléchère¹

2017

AEM

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“…Liao et al . applied the equivalent modeling method to predict the evolution of the dielectric properties of unidirectional composites with high fiber volume fractions . However, it is impossible to get a general formula that could be applied to all the circumstances, since the information that included in the analytical formulas is very limited .…”

Section: Introductionmentioning

confidence: 99%

Finite element simulation and analysis of the dielectric properties of unidirectional aramid/epoxy composites

Zhang

Liu

et al. 2017

Polymer Composites

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Aramid fiber reinforced composites have drawn much attention due to outstanding mechanical and dielectric properties. Dielectric properties should be predicted exactly when such composites are used as electromagnetic functional materials. A simulation method was proposed to predict the effective dielectric constants of unidirectional aramid/epoxy composites in this study. Randomly planar distributed 3D models were created to describe the microstructures of the composites. Parallel and series models were calculated by classical formulas and finite element method to verify the simulation. The distributions of aramid fibers and the dielectric anisotropy of unidirectional composites were analyzed. Dielectric measurements were carried out by the rectangular waveguide method in X‐band and excellent agreements between simulations and experiments were observed. The compression of aramid fibers and interface effect were taken into account to improve the forecasting precision. Comparative analysis was conducted between our simulation method and classical formulas, and it was found that the Maxwell‐Garnett model gives the best fit to the simulation. In addition, the effect of the fiber orientation in electric field was analyzed. POLYM. COMPOS., 39:E2226–E2233, 2018. © 2017 Society of Plastics Engineers

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Advanced Emc Assessment of Composites Material: Monte Carlo Statistical Description With Spherical Inclusions and Improvement With Srom

Lalléchère¹

2020

PIER Letters

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This article proposes an advanced methodology to deal with the complexity of composite materials modeling up to 60 GHz. For radiofrequency (RF) requirements, it has been demonstrated that the distribution of conductive inclusions plays a major role. Since their locations are intrinsically subject to uncertain assumptions, the Monte Carlo (MC) technique is considered as a golden standard. Unfortunately, the computational costs involved by coupling full-wave electromagnetic (EM) simulations and MC remains prohibitive. The aim of this proposal is to demonstrate the interest of stochastic reduced order method (SROM) to tackle computational constraints, jointly with the statistical precision needed for a realistic description of RF composites.

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Equivalent modeling of the microwave dielectric properties for fiber reinforced shielding composites

Cited by 3 publications

References 6 publications

Optimized 3-D electromagnetic models of composite materials in microwave frequency range: application to EMC characterization of complex media by statistical means

Optimized 3-D electromagnetic models of composite materials in microwave frequency range: application to EMC characterization of complex media by statistical means

Finite element simulation and analysis of the dielectric properties of unidirectional aramid/epoxy composites

Advanced Emc Assessment of Composites Material: Monte Carlo Statistical Description With Spherical Inclusions and Improvement With Srom

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