Analysis on the Shielding Effectiveness of Metallic Box with Apertures Based on FDTD

2012 ◽  
Vol 239-240 ◽  
pp. 283-286 ◽  
Author(s):  
Yin Han Gao ◽  
Jun Jie Gu ◽  
Kai Yu Yang ◽  
Hang Zhang
Keyword(s):  
Design Process ◽  
Efficient Method ◽  
Fdtd Method ◽  
Equipment Design ◽  
Electromagnetic Shielding ◽  
Electronic Equipment ◽  
Shielding Effectiveness ◽  
Shielding Design ◽  
The Way

The SE of the shield is reduced greatly for the existence of aperture in the electronic equipment design process. The shielding characteristic of slot apertures and pore array are analyzed with the method of FDTD, and also put forward the way to increase the SE of the shield. The metallic box of some electronic equipment has been redesigned by applying the conclusion. Practice shows that FDTD method is a fast and efficient method for an aperture question, and the analysis conclusion can be helpful to the electromagnetic shielding design of the metallic box with apertures.

scholarly journals Analysis of the effect of different absorber materials and loading on the shielding effectiveness of a metallic enclosure

2015 ◽  
Vol 13 ◽  
pp. 155-159 ◽  
Author(s):  
S. Parr ◽  
H. Karcoon ◽  
S. Dickmann ◽  
R. Rambousky
Keyword(s):  
Complex System ◽  
Electromagnetic Interference ◽  
Electromagnetic Shielding ◽  
Electronic Equipment ◽  
Shielding Effectiveness ◽  
Resonant Frequencies ◽  
Parameter Variations ◽  
Electromagnetic Shielding Effectiveness ◽  
Dielectric Structures

Abstract. Metallic rooms as part of a complex system, like a ship, are necessarily connected electromagnetically via apertures and cables to the outside. Therefore, their electromagnetic shielding effectiveness (SE) is limited by ventilation openings, cable feed-throughs and door gaps. Thus, electronic equipment inside these rooms is susceptible to outer electromagnetic threats like IEM (Intentional Electromagnetic Interference). Dielectric or magnetic absorber inside such a screened room can be used in order to prevent the SE from collapsing at the resonant frequencies. In this contribution, the effect of different available absorber materials is compared, as well as other properties like weight and workability. Furthermore, parameter variations of the absorber as well as the effect of loading in form of metallic and dielectric structures on the SE are analyzed.

Realization of electromagnetic shielding performance for polyimide-matrix composite by self-metallization

2021 ◽  
pp. 002199832110316
Author(s):  
Jiayang Zhang ◽  
Hongjiang Ni ◽  
Ming Gong ◽  
Jun Li ◽  
Daijun Zhang ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Matrix Composite ◽  
Electromagnetic Interference ◽  
Interfacial Strength ◽  
Amic Acid ◽  
Thermal Reduction ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Heat Condition ◽  
Electromagnetic Interference Shielding Effectiveness

Electromagnetic shielding performance has been achieved for a polyimide (PI)-matrix composite by the strategy of self-metallization of its thermosetting PI matrix. Self-metallization of the thermosetting PI was realized by silver ion/poly(amic acid) (PAA) precursor ion exchange and thermal reduction. The factors influencing the self-metallization were investigated. The electrical conductivity and integrity for the surface of the PI were achieved by optimization of ion exchange/thermal reduction parameters. The fabricated PI-matrix composite exhibits a maximum electromagnetic interference shielding effectiveness value of 81 dB. Importantly, the electromagnetic shielding performance can be maintained even after heat condition of 300°C. Meanwhile, the surface-metallized PI composite exhibits mechanical property equivalent to the pristine composite, and an Ag/matrix interfacial strength higher than 19.6 MPa. Besides, self-metallization mechanism of the thermosetting PI was investigated.

Analyses on the Manufacture and Physical Properties of Electromagnetic Shielding/ Far Infrared Ray Nonwoven

2010 ◽  
Vol 97-101 ◽  
pp. 1790-1793
Author(s):  
Jia Horng Lin ◽  
Yu Tien Huang ◽  
Chin Mei Lin ◽  
Yi Chang Yang ◽  
Chien Teng Hsieh ◽  
...  
Keyword(s):  
Physical Properties ◽  
Far Infrared ◽  
Electromagnetic Shielding ◽  
Breaking Force ◽  
Shielding Effectiveness ◽  
Machine Direction ◽  
Tear Strength ◽  
Burst Strength ◽  
Far Infrared Ray ◽  
Electromagnetic Shielding Effectiveness

According to the results, when low melting polyester fiber increased to be 20%, the electromagnetic shielding/ far infrared ray nonwoven obtained the optimum burst strength, maximum breaking force and maximum tear strength, and they were as follows: burst strength was 4.2 kgf/cm2; maximum breaking force was 153.59 N in the cross machine direction and 70.80 N in the machine direction; maximum tear strength was 215.77 N in cross machine direction and 117.07 N in machine direction; and optimum electromagnetic shielding effectiveness (EMSE) was 45 dB.

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