Shielding Effectiveness Simulation of Small Perforated Shielding Enclosures Using FEM

Kubík, Zdeněk; Skála, Jiří

doi:10.3390/en9030129

Cited by 22 publications

(14 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As a consequence, several studies have been presented on the subject of radiative damage caused by electromagnetic waves on living species [3][4][5]. In addition, the electronic devices themselves are densely integrated and operate at low voltage levels and so may be affected by unwanted electromagnetic fields, with consequent perturbation of their performances [6]. Typical examples includes distortion of radio/TV signals, difficulties in personal communication devices, such as mobile phones, limitations or impediments of electrical sensitive instruments [7].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic shielding effectiveness of carbon fibre reinforced composites

Munalli

Dimitrakis

Chronopoulos

et al. 2019

Composites Part B: Engineering

166

View full text Add to dashboard Cite

This paper reports results on the shielding effectiveness parameter of laminated epoxy composites with carbon fibre reinforcements. Measurements of shielding effectiveness were carried out with a coaxial transmission line testing chamber according to ASTM 4935 standard and epoxy-matrix composites with continuous carbon-fibres were proven to be an excellent electromagnetic interference shielding material, where a composite slab made of 4 layers of prepregs provided more than 99.9% of electromagnetic attenuation. It was found that the reflection mechanism of the shielding material was mainly influenced by the fibre volume ratio, and that an increase in the number of layers of the composite resulted in higher shielding effectiveness due to a greater absorption mechanism. Calculations of the shielding effectiveness parameter of the material used were made by means of commercial electromagnetic simulation tools, having determined experimentally the overall resistivity of the composite. The findings presented in this work suggest that in presence of a greater number of interfaces at different impedance the separate modelling of matrix and fibres at mesoscopic scale must be taken into account.

show abstract

Section: Introductionmentioning

confidence: 99%

Electromagnetic shielding effectiveness of carbon fibre reinforced composites

Munalli

Dimitrakis

Chronopoulos

et al. 2019

Composites Part B: Engineering

166

View full text Add to dashboard Cite

show abstract

“…Based on our previous study [30], the gaps have significant effects on the shielding factor. Therefore, we calculated the shielding factor numerically using the FEM with a commercial analysis software (Ansoft Maxwell) [30], [31]. All the parameters of the simulation model except the gap width of the ferrite shield were the same to those of the experimental setup, as described in Section II.B.…”

Section: Results Analyses and Discussionmentioning

confidence: 99%

Study of Magnetic Noise of a Multi-Annular Ferrite Shield

Yang

et al. 2020

IEEE Access

View full text Add to dashboard Cite

Ferrites are promising nonmetallic materials used for the fabrication of low-noise magnetic shields because they possess high permeability and high electrical resistivity. However, large-sized ferrite components are difficult to fabricate or machine. In this study, we develop a cylindrical ferrite shield that consists of five annuli and two lids with an inner volume of φ11.2 cm × 22.5 cm. Although this structure contains gaps between different components, it eases considerably the fabrication and machining process as compared to the entire module. The magnetic noise is measured by a spin-exchange relaxation-free atomic magnetometer, and the detrimental effects of the gaps are analyzed quantificationally using the finite element method. Our research results indicate that compared with the ferrite shield without gaps, the magnetization noise increases by 34.1%. Nonetheless, the magnetic noise at the center of the ferrite shield achieves 5.5f −1/2 fT, which is much lower than that of µ-metal shields with a similar size. If the gap width can be reduced to be smaller than 0.01 mm, the increase of the magnetization noise will be less than 4.9%, which can be negligible in practical applications. Our study provides a low-cost, readily available, and low-noise ferrite shield structure.

show abstract

“…Currently, model studies are increasingly used as a research method in the field of shielding effectiveness of various materials, including textiles. Literature reports [41][42][43][44][45][46][47][48][49] show two main directions of development of such research: various analytical modeling processes and numerical modeling.…”

Section: Introductionmentioning

confidence: 99%

EMI Shielding and Absorption of Electroconductive Textiles with PANI and PPy Conductive Polymers and Numerical Model Approach

2021

View full text Add to dashboard Cite

The paper presents the results and analysis of interdisciplinary research concerning electromagnetic field shielding, conductive polymers printed on textiles and numerical simulation using the finite element method (FEM). The use of conductive, layered textiles for shielding electromagnetic interference (EMI) has been proposed. After establishing the optimal conditions for deposition of polyaniline (PANI) and polypyrrole (PPy) on polyacrylonitrile (PAN) fabric, conductive composites were made by means of reactive inkjet printing. For this purpose, polyacrylonitrile (PAN) fabrics were coated with polyaniline or polypyrrole, obtained by chemical oxidation of aniline hydrochloride and pyrrole by ammonium peroxydisulfate. The morphology of the obtained coatings was observed using a scanning electron microscope (SEM). The conductive properties (surface resistance) of the fabrics were measured using the four-wire method, and the tests of the effectiveness of electromagnetic shielding were carried out using the waveguide method in the frequency range from 2.5 to 18 GHz. The results of experimental shielding effectiveness (SE) tests and numerical simulation showed that the composites of polyacrylonitrile with polyaniline PAN/PANI and polyacrylonitrile with polypyrrole PAN/PPy achieved very good and good EMI shielding efficiency, respectively. Moreover, the obtained measurement results were verified by numerical modeling with the use of FEM–ANSYS HFFS software.

show abstract

Shielding Effectiveness Simulation of Small Perforated Shielding Enclosures Using FEM

Cited by 22 publications

References 13 publications

Electromagnetic shielding effectiveness of carbon fibre reinforced composites

Electromagnetic shielding effectiveness of carbon fibre reinforced composites

Study of Magnetic Noise of a Multi-Annular Ferrite Shield

EMI Shielding and Absorption of Electroconductive Textiles with PANI and PPy Conductive Polymers and Numerical Model Approach

Contact Info

Product

Resources

About