Novel multilayer arrangement of conductive layers traps the electromagnetic interferences by multiple internal reflections at high frequency in the far field

Gaoui, Bachir; Hadjadj, Abdechafik; Kious, Mecheri

doi:10.1007/s10854-016-6006-z

Cited by 11 publications

(10 citation statements)

References 26 publications

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“…Therefore the presence of multi-reection increases the total reection inside the material. 48,49 Moreover the rigid foam composites have excellent electrical and dielectric constants compared to the blank group. And the incident electromagnetic waves phase changes and magnitude decreases exponentially.…”

Section: -45mentioning

confidence: 97%

Effects of hydrotalcite on rigid polyurethane foam composites containing a fire retarding agent: compressive stress, combustion resistance, sound absorption, and electromagnetic shielding effectiveness

Peng

Wang

et al. 2018

RSC Adv.

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Section: -45mentioning

confidence: 97%

Effects of hydrotalcite on rigid polyurethane foam composites containing a fire retarding agent: compressive stress, combustion resistance, sound absorption, and electromagnetic shielding effectiveness

Peng

Wang

et al. 2018

RSC Adv.

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“…These materials are selected according to the desired applications [21]. The efficiency of the shielding (SE) is a property of the materials indicating the ability to fight against undesirable electromagnetic interference [1,3,7].…”

Section: Shielding Theorymentioning

confidence: 99%

“…Electromagnetic shielding is the main effective solution to reduce interference and interactions between devices or subcomponents of the devices themselves [6][7]. In general, materials of good electrical conductivity such as copper, aluminum, etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of Plastic Deformation of Copper on the Behavior of Electromagnetic Shielding

Elhadi¹,

Hadjadj²,

Gaoui³

et al. 2019

ACSM

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Nowadays, one of the main reasons for increasing material performances is the need to reduce electromagnetic interference (EMI) generated by high-frequency electronic circuits, which is a serious problem in terms of equipment performances. For this purpose, copper is one of the most used materials for shielding applications. Plastic deformation at the macroscopic scale generates at the microscopic scale many moving dislocations (internal stresses) affecting the efficiency of the electromagnetic shielding. However, the plastic deformation which affects the electrical properties ensuring the shielding properties is still badly known and should be more studied and constitutes a promising research field. The main objective of this work is to study the effect of the copper plastic deformation on its electromagnetic shielding efficiency in the ]0-1GHz] frequency range. A series of electromagnetic shielding experiments was carried out by means of an Electro Magnetic Dual Transverse Cell (DTEM), on copper samples with a purity level of 99 % i) without plastic deformation ii) deformed with a rate of 2 % and 3 %. The results obtained clearly shown the variation of the electromagnetic shielding efficiency as a function of the copper plastic deformation rate.

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“…All electronic tools that distribute or transmit electrical energy create electromagnetic waves, which have harmful impacts on human health, surrounding environment, and device performance [1]. The electromagnetic wave created by them gradually interfere with each other, as well are called the electromagnetic interference (EMI) [2][3][4][5][6][7][8]. In fact, the composite material that designed for the electromagnetic compatibility (EMC) applications contain conductive fibres (High electrical conductivity σ>>0) embedded in a dielectric medium (electrical conductivity σ=0) [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…The electromagnetic wave created by them gradually interfere with each other, as well are called the electromagnetic interference (EMI) [2][3][4][5][6][7][8]. In fact, the composite material that designed for the electromagnetic compatibility (EMC) applications contain conductive fibres (High electrical conductivity σ>>0) embedded in a dielectric medium (electrical conductivity σ=0) [3,4]. In general the conductive fillers are usually added with polymers or in elastomer to increase the conductivity of matrix to attenuate the incoming microwaves similarly the magnetic fillers such as ferric oxide, nickel and cobalt particles are added with polymeric materials to improve magnetic behavior of base matrix to block the incoming magnetic field of microwave.…”

Section: Introductionmentioning

confidence: 99%

Impact of Temperature Variation on the Electromagnetic Shielding Behavior of Multilayer Shield for EMC Applications

Merizgui¹,

Hadjadj²,

Kious³

et al. 2019

RCMA

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This paper attempts to disclose how temperature variation affects the electromagnetic shielding of a multilayer composite made of copper (Cu) fibers surrounded by silicon (Si). The model of the composite was fabricated by physical vapor deposition method, and tested with the temperature rising from room temperature (RT), 50º C, 85º C to 110º C. Under these temperatures, several electromagnetic shielding parameters of the composite were measured in various operating microwave frequencies (E, F, I and J bands). Among them, dielectric permittivity was acquired by LCR tester, magnetic permeability was measured by vibrating sample magnetometer (VSM), and the electromagnetic (EM) wave attenuation was recorded by typical microwave test bench. The results show that the composite had an EMI shielding of 20dB at 85º and 100dB at the RT; the reflection loss of the composite (volume fraction: 0.32) was also 100dB at the RT. Thus, the temperature rise suppresses the reflection loss; the composite has better electromagnetic shielding effect at the RT than at elevated temperatures; the volume faction enhances the wave attenuation of the composite. The results provide a good reference for the design of stable electromagnetic shielding materials at elevated temperatures.

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Novel multilayer arrangement of conductive layers traps the electromagnetic interferences by multiple internal reflections at high frequency in the far field

Cited by 11 publications

References 26 publications

Effects of hydrotalcite on rigid polyurethane foam composites containing a fire retarding agent: compressive stress, combustion resistance, sound absorption, and electromagnetic shielding effectiveness

Effects of hydrotalcite on rigid polyurethane foam composites containing a fire retarding agent: compressive stress, combustion resistance, sound absorption, and electromagnetic shielding effectiveness

Influence of Plastic Deformation of Copper on the Behavior of Electromagnetic Shielding

Impact of Temperature Variation on the Electromagnetic Shielding Behavior of Multilayer Shield for EMC Applications

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