Design of Homogeneous and Composite Materials From Shielding Effectiveness Specifications

Paulis, Francesco de; Nişanci, Muhammet Hilmi; Orlandi, Antonio; Koledintseva, Marina Y.; Drewniak, James L.

doi:10.1109/temc.2013.2280463

Cited by 30 publications

(11 citation statements)

References 23 publications

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“…where is the static relative permittivity, ∞ is the relative high-frequency limit permittivity, is the relaxation time, is the lowest boundary and is the complex frequency dependent relative permittivity of the equivalent homogeneous material described by the singleterm Debye model [16][17]. In shielding problems determines the impedance of the material.…”

Section: Debye Parameters In Se Calculationmentioning

confidence: 99%

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Parameter Optimization of Frequency Selective Surfaces Made of Composite Materials

Kizilçay

2021

Sakarya University Journal of Science

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Debye model is used for approximating the frequency dependent complex effective permittivity of the composite structures in filter and shielding applications at microwave frequencies. In Debye model, desired shielding effectiveness (SE) is obtained by determining the Debye parameters using trial and error method. But this may result in wasting time or not converging to an optimum solution. In this work to overcome this problem Debye parameters were optimized by using Differential Evolution (DE) algorithm. A Maxwell Garnett (MG) mixing rule was applied to these optimized parameters to obtain frequency selective surface (FSS) parameters. 12dB shielding threshold was chosen between 0.05 -5GHz frequency range. In accordance with the obtained parameters of FSS, a structure was designed in CST simulation software and simulations had been conducted to obtain SE results. It was seen that the results obtained from analytical computations agree with those obtained from simulations.

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Section: Debye Parameters In Se Calculationmentioning

confidence: 99%

“…where ∞ is dependent on , ∞ and values which will be involved in optimization processes. ∈ [0.8 − 1.6] ensures the flatness of shielding line [16] above the threshold between the and ℎ which were set to 0.5GHz and 5GHz respectively.…”

Section: Debye Parameters In Se Calculationmentioning

confidence: 99%

Parameter Optimization of Frequency Selective Surfaces Made of Composite Materials

Kizilçay

2021

Sakarya University Journal of Science

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“…The metals are the most materials used in the shielding applications thanks to its high conductivity, but metals have few drawbacks such as prone to corrosion, are mainly by reflections, and heavyweights especially in the application where the mass should be low as low possible [4][5][6][7][8][9][10]. The efficient composite materials in shielding applications must be electrically conducting; the main responsible element for the conduction is the reinforcements in composite materials [24][25][26], several studies are reported on shielding materials like metallic coating, metallic fillers, and metallic fibers due to its excellent conductivity, permeability, and superficial skin depth [27].…”

Section: Introductionmentioning

confidence: 99%

Effect of Human Body Temperature on New Multilayer Composite Shield in Pacemaker

Merizgui¹,

Hadjadj²,

Kious³

et al. 2019

RCMA

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This paper presents a novel method for evaluating the effect of human body temperature on the electromagnetic shielding effectiveness (SE) of pacemaker. There are many sources of electromagnetic interference that interact with pacemakers: Cell phones may be considered responsible for electromagnetic interference EMI when they were held in the same part with the pacemaker; also, the magnetic resonance imaging makes a serious problem and must be avoided. In this paper, a new multilayer composite was prepared and built from alternating layers, the composite is reinforced by Titanium fibres and the dielectric layers made from the Silicon material, the dielectric layers are sandwiched between composites with Ti fibres symmetrically. Ti is the most widely used metal for pacemakers due to its high biocompatibility with the human body. Silicon has the advantages for being resistant material of temperature, lightweight, and its flexibility (bendable structure). The obtained simulation results prove the effectiveness of the proposed shield in the temperature range 37-41 °C , this is mainly due to the multi-reflection mechanism between the layers due to the high mismatched impedances.

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“…Absorbing materials can be defined as a class of material with a specific ability to absorb and convert electromagnetic noise into heat. These types of amorphous magnetic thin films are classified in the categories of metamaterials, because they are able to provide electromagnetic properties that cannot be met by conventional homogeneous materials [ 1 , 12 , 13 ]. The capability that magnetic thin films present to reduce EMI is determined by its absorption loss and this depends on many factors, such as material parameters, frequency and sample dimensions [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Transmission Attenuation Power Ratio Analysis of Flexible Electromagnetic Absorber Sheets Combined with a Metal Layer

et al. 2018

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Electromagnetic noise absorber sheets have become a solution for solving complex electromagnetic interference (EMI) problems due to their high magnetic losses. This contribution is focused on characterizing a novel structure that is based on an absorber film with a metal layer attached on its top side. Two different absorber compositions were combined with Al and Cu metal layers in order to study the improvement on the performance of these structures, depending on the complex permeability, absorber film thickness, and type of metal. The transmission attenuation power ratio of the absorber films is analyzed and compared to the performance of absorber and metal structures. The measurement procedure is carried out attaching the films into a microstrip line that has been designed based on IEC standard (IEC 62333-2). This test fixture is employed as a transmission line to simulate a general noise path. The performance of absorber composites to filter electromagnetic noise is evaluated through analyzing S21 and S11 parameters. This is carried out with the aim of finding out in which conditions the absorption loss is improved when a metal layer is attached. In addition, the possible re-radiation effect, due to the magnetic field that is generated by the eddy currents induced in the metal layer, is examined.

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Design of Homogeneous and Composite Materials From Shielding Effectiveness Specifications

Cited by 30 publications

References 23 publications

Parameter Optimization of Frequency Selective Surfaces Made of Composite Materials

Parameter Optimization of Frequency Selective Surfaces Made of Composite Materials

Effect of Human Body Temperature on New Multilayer Composite Shield in Pacemaker

Transmission Attenuation Power Ratio Analysis of Flexible Electromagnetic Absorber Sheets Combined with a Metal Layer

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