Conception and realization of multilayered composite electromagnetic shielding material at microwave frequency by using genetic algorithm

2008 ◽  
Author(s):  
Pham Hong Thinh ◽  
Nguyen Thi Lan Huong ◽  
Hoang Ngoc Nhan ◽  
J.-L. Wojkiewicz
Keyword(s):  
Genetic Algorithm ◽  
Microwave Frequency ◽  
Electromagnetic Shielding ◽  
Multilayered Composite ◽  
Shielding Material

The investigation of the electromagnetic shielding effectiveness of multi-layered nanocomposite materials from reduced graphene oxide-doped P(AN-VAc) nanofiber mats/PP spunbond

2018 ◽  
Vol 53 (11) ◽  
pp. 1541-1553
Author(s):  
İsmail Tiyek ◽  
Mustafa Yazıcı ◽  
Mehmet Hakkı Alma ◽  
Şükrü Karataş
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Surface Samples ◽  
Reduced Graphene ◽  
Nanofiber Mats ◽  
Electromagnetic Shielding Effectiveness ◽  
Poly Acrylonitrile ◽  
Shielding Material

In this study, the production of an electromagnetic shielding material by doping reduced graphene oxide was aimed. Graphene oxide was produced from graphite through modified Hummer's method, and reduced graphene oxide was obtained by reducing graphene oxide. The reduced graphene oxide- doped poly(acrylonitrile-co-vinyl acetate) nanofiber mats were spun on the Polypropylene spunbond fabrics by a multi-needle electrospinning device at different lap numbers. Multi-layered surface samples of spunbond/nanofiber mats were obtained via calendaring process after overlapping in different layer numbers. The electromagnetic shielding effectiveness (EMSE) of these samples was measured in the range of 0.03–1.5 GHz according to ASTM D4935 standard. The effects of the numbers of laps and layers on the electromagnetic shielding effectiveness of the mats were also investigated. It was found that electromagnetic shielding effectiveness is greatly affected by changing the numbers of laps and layers. Consequently, the highest electromagnetic shielding effectiveness value of 35.49 dB was obtained from the sample containing two layers of nanofiber mats, each of which consisted 50 laps of nanofibers.

ABS Fabrics Chemically Plated by Cu/Ni-P as Electromagnetic Shielding Material

2011 ◽  
Vol 306-307 ◽  
pp. 385-388
Author(s):  
Cheng Da Yu ◽  
Qi Bin Deng ◽  
Ping Li ◽  
Ming Cun Wang ◽  
Yong Feng Wang
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
High Frequency ◽  
Gradual Increase ◽  
Electromagnetic Shielding ◽  
Shielding Effect ◽  
Ideal Candidate ◽  
Varying Thickness ◽  
Fabric Composite ◽  
Shielding Material

In this paper, a novel composite material of Acrylonitrile-Butadlene-Styrene resin (ABS)-based fabric coated with Cu/Ni-P was prepared via chemical redox plating technique. A series of such composite materials with varying thickness of Cu and Ni-P showed remarkable electromagnetic shielding ability. With the increase of Cu thickness, the shielding effect (SE) increased gradually, but leveled off after 1.5μm at a SE of about 70dB. Similarly, with the increase of the depth of Ni-P coats, the SE showed a trendency of gradual increase, and leveled off after 1.0μm at a SE of about 45dB. The optimum ABS/Cu/Ni-P was Cu 1.5μm and Ni-P 1.0μm unilaterally. The ABS/Cu/Ni-P composite material possessed excellent shielding ability in the range of 0.001-1000MHz at a stable SE of >80dB, and it also possessed ideal shielding effect in the range of >36GHz. But in the range of 10-18GHz, the shielding effect is slightly decreased gradually to about 60dB. So the ABS/Cu/Ni-P fabric composite is an ideal candidate for electromagnetic shielding material at low and high frequency radiations.

Study on Lightweight Composited Electromagnetic Shielding Materials of Flakeboard with Electroless Copper

2009 ◽  
Vol 79-82 ◽  
pp. 827-830 ◽  
Author(s):  
Jin Tian Huang ◽  
Jiang Zhu ◽  
Jin Jia
Keyword(s):  
Electromagnetic Shielding ◽  
Potassium Ferrocyanide ◽  
Copper Plating ◽  
Shielding Effectiveness ◽  
Hot Press ◽  
Electroless Copper Plating ◽  
Electroless Copper ◽  
Main Components ◽  
Electromagnetic Shielding Effectiveness ◽  
Shielding Material

In order to obtain the electromagnetic shielding material, the lightweight flakes of poplar are selected to be the substrate. After the electroless copper plating, the flakes turn to electric cell which is made by hot-press with bicomponent epoxy, and it turn to electromagnetic shielding materials. In this paper, the electromagnetic shielding effectiveness of electromagnetic shielding materials is investigated. The results indicates that the reasonable ratio of main components of the electroless copper plating is: copper sulfate 80g/L, reducing agent 90 g/L, K-Na tartrate (TART) 65 g/L, EDTA•2Na100 g/L, α, α'-dipyridyl 10mg/L, potassium ferrocyanide 50 mg/L. In the testing of Hertzian waves between 9 kHz～1.5GHz, the average effectiveness of electromagnetic shielding is 60.4dB.

Plasmolysis-inspired Yolk-Shell Hydrogel-core@Void@MXene-shell Microspheres with Strong Electromagnetic Interference Shielding Performance

2021 ◽  
Author(s):  
Chenxi Li ◽  
Xingxing Ni ◽  
Yang Lei ◽  
Shangyang Li ◽  
Bo You ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Waves ◽  
Multilayered Structure ◽  
Electromagnetic Shielding ◽  
Electromagnetic Interference Shielding ◽  
Shielding Material

Benefiting from specific multilayered structure, yolk−shell microspheres with void spaces are considered as the promising electromagnetic shielding material which does well in enhancing the decay of electromagnetic waves. Commonly reported...

A low-dielectric decoration strategy to achieve absorption dominated electromagnetic shielding material

2020 ◽  
Vol 183 ◽  
pp. 107690 ◽  
Author(s):  
Zirui Jia ◽  
Chao Wang ◽  
Ailing Feng ◽  
Pengbao Shi ◽  
Chuanhui Zhang ◽  
...  
Keyword(s):  
Electromagnetic Shielding ◽  
Low Dielectric ◽  
Shielding Material

Reliability-based design optimization of electromagnetic shielding structure using neural networks and real-coded genetic algorithm

2014 ◽  
Vol 228 (18) ◽  
pp. 3471-3481 ◽  
Author(s):  
Heeralal Gargama ◽  
Sanjay K Chaturvedi ◽  
Awalendra K Thakur
Keyword(s):  
Genetic Algorithm ◽  
Neural Networks ◽  
Artificial Neural Networks ◽  
Design Optimization ◽  
Electromagnetic Shielding ◽  
Optimization Approach ◽  
Reliability Based Design Optimization ◽  
Reliability Based Design ◽  
Design Variables ◽  
Real Coded Genetic Algorithm

The conventional approaches for electromagnetic shielding structures’ design, lack the incorporation of uncertainty in the design variables/parameters. In this paper, a reliability-based design optimization approach for designing electromagnetic shielding structure is proposed. The uncertainties/variability in the design variables/parameters are dealt with using the probabilistic sufficiency factor, which is a factor of safety relative to a target probability of failure. Estimation of probabilistic sufficiency factor requires performance function evaluation at every design point, which is extremely computationally intensive. The computational burden is reduced greatly by evaluating design responses only at the selected design points from the whole design space and employing artificial neural networks to approximate probabilistic sufficiency factor as a function of design variables. Subsequently, the trained artificial neural networks are used for the probabilistic sufficiency factor evaluation in the reliability-based design optimization, where optimization part is processed with the real-coded genetic algorithm. The proposed reliability-based design optimization approach is applied to design a three-layered shielding structure for a shielding effectiveness requirement of ∼40 dB, used in many industrial/commercial applications, and for ∼80 dB used in the military applications.

scholarly journals Lightweight and flexible MXene/CNF/silver composite membranes with a brick-like structure and high-performance electromagnetic-interference shielding

RSC Advances ◽  
2019 ◽  
Vol 9 (51) ◽  
pp. 29636-29644 ◽  
Author(s):  
Wei Xin ◽  
Guo-Qiang Xi ◽  
Wen-Tao Cao ◽  
Chang Ma ◽  
Tong Liu ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
High Performance ◽  
Composite Membranes ◽  
Electromagnetic Shielding ◽  
Electromagnetic Interference Shielding ◽  
Shielding Material ◽  
Silver Composite

Flexible and lightweight MXene/CNF/silver composite membranes are vacuum filtered to form a high electromagnetic shielding material with a brick-like structure. The membranes have an excellent electromagnetic shielding performance of 50.7 dB.

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