FDTD Analysis of Effectiveness of Shielding Clothes in Suppressing Electromagnetic Field in Phantom Model

Yoshimura, Y.; Nagano, I.; Yagitani, Satoshi; Ueno, Tomohiko; Nakayabu, Toshihiro

doi:10.1541/ieejfms.123.623

Cited by 11 publications

(5 citation statements)

References 10 publications

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“…The first part is the study of test methods. For example, Kurokawa and Sato 7 and Yoshimura et al 8 studied the test method of the SE of the clothing by time domain analysis, and tested the chest area of the mannequin. Wang et al 9 used the same EMS fabrics to manufacture and test the clothing with different structures and styles, and analyzed the laws of various factors on protection effect of the clothing.…”

Section: Introductionmentioning

confidence: 99%

Influencing factors of shielding effectiveness test of electromagnetic shielding clothing

Wang

Zhang

Hang

et al. 2022

Journal of Industrial Textiles

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There is no perfect method to test and evaluate electromagnetic shielding (EMS) clothing up to now. The main reason is that the influence laws of the emission source parameters and the test position on the shielding effectiveness (SE) of the EMS clothing has not been clarified. In this paper, the SE of the EMS clothing is tested using a semi anechoic chamber in the frequency range of 1–18 GHz. The variation of the SE of the clothing is explored when the emission source parameters and the test positions are different. It is found that the SE of the EMS clothing decreases obviously with the increase of the testing distance, and the decline degrees are different with different frequencies. The decline trend slows down and approaches stability as the distance increases to a certain extent. The influence of the emission source angle on the SE is closely related to the frequency and positive or negative effects are produced at different frequency points. The SE are low when the test points are in the leakage areas with seams and openings, and the SE are high in the normal area. Under certain conditions, the measured SE of the clothing is close to zero or even less than zero. That is, a dangerous frequency point is formed. The mechanism of the above-mentioned laws is analyzed, and a new multi-index composite evaluation method is proposed to scientifically evaluate the EMS clothing based on the comprehensive consideration of the influencing factors. This research has great significance to promote the scientific test, evaluation and relevant standard formulation of the EMS clothing, and provides a reference role for the design and production of the EMS clothing.

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Section: Introductionmentioning

confidence: 99%

Influencing factors of shielding effectiveness test of electromagnetic shielding clothing

Wang

Zhang

Hang

et al. 2022

Journal of Industrial Textiles

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“…Later, a number of scholars improved the above methods, such as: Kurczewska et al (2012) selected the low-frequency range of 50 Hz-30 MHz to test the EMS clothing with different purposes, and pointed out the criteria to choose materials of the EMS clothing. Kurokawa and Sato (2003) and Yoshimura et al (2003) studied the testing method of the SE of the EMS clothing by time-domain analysis.…”

Section: Introductionmentioning

confidence: 99%

Influencing factors and rules of shielding effectiveness of electromagnetic shielding clothing sleeve

Wang

Liu

et al. 2020

IJCST

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PurposeThe change rules of the shielding effectiveness (SE) of the sleeve has not been clarified, which leads to the lack of the basis for the design, manufacture and evaluation of the electromagnetic shielding (EMS) clothing.Design/methodology/approachAccording to a simplified analysis model, a series of sleeve samples with different fabrics and styles are designed and manufactured. The SE of the sleeve is tested with the proposed special test method in a semi-anechoic chamber to analyze the influence of different factors on the SE of the sleeve.FindingsThe SE is greatly reduced about 60–90% after the fabric is manufactured into the sleeve. The larger the sleeve length is, the higher the peak value of the SE is. When the sleeve length is low, the SE value is easy to appear negative. As the cuff circumference increases, the SE of the sleeve will change with the frequency band. The influence of the cuff style on the SE of the sleeve mainly depends on the cuff width and style. The larger the cuff width is, the lower the overall SE of the sleeve is. The more wrinkles there are at the cuff, the better the SE of the sleeve is.Originality/valueOur results provide a reference for the design, production and evaluation of the sleeve and the whole EMS clothing.

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“…They all considered that the SE of fabric couldn't describe the SE of the clothing and the SE of clothing should be obtained according to the characteristic of each garment part [3,4]. Kurokawa and Sato [5] and Yoshimura et al [6] have studied the feature of the SE of the EMS clothing by the time domain measurements and the FDTD analysis. They constructed and derived the SE functions of the clothing on the point to the point along the curved surface of the body.…”

Section: Introductionmentioning

confidence: 99%

Computation Model of Shielding Effectiveness of Symmetric Partial for Anti-Electromagnetic Radiation Garment

Wang¹,

Liu²,

Jiao³

2013

PIER B

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Abstract-Current shielding effectiveness (SE) of electromagnetic shielding (EMS) fabric is tested in the plane state, the testing results are difficult to describe the shielding effect of a garment in a curve surface state after manufactured by the fabric. To solve this problem, this study proposes a new SE computation model of the EMS fabric based on a SE vector. The model can calculate a theoretical SE value of the EMS fabric in the curve surface state. A number of factors which determine the SE of the fabric with a curve surface are analyzed according to the principle of the reflection and transmission of the electromagnetic wave. This study also gives a new argument that the curve fabric can be divided into many micro-planes and the fabric SE is considered as a vector. And then a computation model of the SE of the curve fabric is constructed. The detail of computation is deduced, and an application example is given. Results of experiments and analyses show that the method is scientific and correct, and the error between the computation SE value and the testing SE value of the local garment is less than 3%. The model provides a new way to calculate the SE of the EMS fabric with symmetric curved surface.

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FDTD Analysis of Effectiveness of Shielding Clothes in Suppressing Electromagnetic Field in Phantom Model

Cited by 11 publications

References 10 publications

Influencing factors of shielding effectiveness test of electromagnetic shielding clothing

Influencing factors of shielding effectiveness test of electromagnetic shielding clothing

Influencing factors and rules of shielding effectiveness of electromagnetic shielding clothing sleeve

Computation Model of Shielding Effectiveness of Symmetric Partial for Anti-Electromagnetic Radiation Garment

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