Theoretical Approach of Electromagnetic Shielding of Multilayer Conductive Sheets

Benhamou, Sidi Mohamed; Hamouni, M.; Khaldi, and Smain

doi:10.2528/pierm15020101

Cited by 13 publications

(6 citation statements)

References 17 publications

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“…Electromagnetic waves penetrate the surface of the shielding material and continue to propagate in the material body. When they propagate through the material to the other side of the surface, the electromagnetic wave will reflect or penetrate the material. , The reflected electromagnetic waves will further attenuate in the material body and cause multiple reflections and losses, thus forming SE M , which is expressed as follows: SE M = 20l g (1 – e –2 d /δ ). Here, δ represents the thickness of the material through which the electromagnetic wave penetrates, that is, the skin depth.…”

Section: Emis Mechanismsmentioning

confidence: 99%

Graphene Foams for Electromagnetic Interference Shielding: A Review

Jia

Mingfa

Liu

et al. 2020

ACS Appl. Nano Mater.

116

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Electromagnetic shielding materials generated with the extensive application of electromagnetic wave have been utilized in military radar stealth, electromagnetic shielding of advanced electronic equipment, electromagnetic radiation protection, and other fields. With the quick development of Internet and electronic devices, a large number of electromagnetic waves flood into the living environment, affecting human life and health potentially. Meanwhile, further development and applications of terahertz (THz) electromagnetic detection technology challenge the research of electromagnetic interference shielding (EMIS). Therefore, EMIS materials have been developed toward the direction of high efficiency, wide bandwidth, and lightweight. However, traditional single metal-based and polymer-based EMIS materials cannot meet the demand. Current studies confirmed that graphene, especially graphene foam (GF)-based EMIS materials, has become one of the most potential EMIS materials in the field of electromagnetic wave loss and absorption due to its unique physical structure and excellent electrical and mechanical properties. GF, a three-dimensional graphene structure prepared from graphene and its derivatives not only fully utilizes the unique physical and chemical properties of graphene but also further reduces the density of EMIS materials and improves the EMIS performance. This work expounds the potential value of graphene in the field of EMIS based on the mechanism of EMIS and then summarizes the recent progress of GF-based materials for EMIS applications. More focus on the effects of different preparation methods toward the structure, mechanical properties, and EMIS performance of GF materials are introduced and discussed in detail.

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Section: Emis Mechanismsmentioning

confidence: 99%

Graphene Foams for Electromagnetic Interference Shielding: A Review

Jia

Mingfa

Liu

et al. 2020

ACS Appl. Nano Mater.

116

View full text Add to dashboard Cite

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“…where P i and P t are the power of the incident and transmitted EM waves, respectively. Total shielding is the sum of reflective, absorptive and multiple reflective components [33,34]…”

Section: Shielding Effectiveness: Theory and Measurementmentioning

confidence: 99%

Electromagnetic Interference Shielding Efficiency Enhancement of the Pani-Csa Films at Broad Band Frequencies

Sasikumar¹,

Mol²,

George³

et al. 2017

PIER M

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A material sample of Camphour Sulphonic Acid doped Polyaniline (PANI-CSA) is contemplated towards its conceivable use as a microwave shield. Shielding towards electromagnetic interferences (EMI) is measured over various frequency bands by the waveguide method. Plane wave electromagnetic theory is used to generalize the overall reflection and transmission coefficients of the polymer. EMI shielding of the polymer, in the form of Shielding Efficiency (SE), is analyzed over the microwave frequency range from 2 to 18 GHz, demonstrating the potential value of the polymer as an electromagnetic interference (EMI) shield for commercial purposes. The shielding film is fabricated using standard procedure with CSA as the dopant and m-cresol as the solvent. The shielding effectiveness as high as 45 dB for the sample of PANI doped with CSA is observed.

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“…Composite materials made of conductive reinforcement and dielectric matrices have been the subject of multiple studies to determine their electrical and shielding properties. While numerically-based approaches offer accurate results in this regard [1][2][3][4][5][6][7], the need for simple and fast methods which can be used for conducting preliminary studies makes analytical design tools desirable. When this path is pursued, two types of studies can be adopted.…”

Section: Introductionmentioning

confidence: 99%

Homogenization of Metal Grid Reinforced Composites for Near-Field Low Frequency Magnetic Shielding

Achkar¹,

Pichon²,

Bensetti³

et al. 2021

PIER M

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The purpose of this paper is to provide simple analytical homogenization methods for composite materials containing a metallic wire grid. Estimating their effective electrical properties facilitates the numerical simulation of composite structures for shielding applications in the automotive industry. The presented methods are based on surface impedance approaches and effective media theory. The obtained results show that the shielding properties of the described wire grid composites can be accurately estimated and bounded, using the proposed theories in the low frequency range. The frequency limits vary according to the studied sample. For the presented materials, the validity of the results is shown to be up to a few megahertz. The experimental validation is done by measuring the shielding effectiveness of composite samples using a near-field test bench.

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Theoretical Approach of Electromagnetic Shielding of Multilayer Conductive Sheets

Cited by 13 publications

References 17 publications

Graphene Foams for Electromagnetic Interference Shielding: A Review

Graphene Foams for Electromagnetic Interference Shielding: A Review

Electromagnetic Interference Shielding Efficiency Enhancement of the Pani-Csa Films at Broad Band Frequencies

Homogenization of Metal Grid Reinforced Composites for Near-Field Low Frequency Magnetic Shielding

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