Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (01): 124-130.doi: 10.13475/j.fzxb.20190101507

• Apparel Engineering • Previous Articles     Next Articles

Effect of clothing structure and dummy model on shielding effectiveness of electromagnetic protecting clothing

WANG Qiuhan1, WANG Yajing2, DONG Keping3, XIAO Hong1,4()   

  1. 1. School of Fashion, Wuhan Textile University, Wuhan, Hubei 430073, China
    2. Beijing Jike Protection & Tech. Co., Ltd., Beijing 100124, China
    3. College of Textiles, Donghua University, Shanghai 201620, China
    4. Institute of Quartermaster Engineering & Technology, Institute of System Engineering, Academy of Military Science, Beijing 100010, China
  • Received:2019-01-02 Revised:2019-08-29 Online:2020-01-15 Published:2020-01-14
  • Contact: XIAO Hong E-mail:76echo@vip.sina.com

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Abstract:

In order to explore the shielding effectiveness and influencing factors of different structures and styles of clothing made of the same electromagnetic shielding fabric,four types of electromagnetic protecting clothing were designed for testing in semi-anechoic chamber by wearing dummy method. The factors affecting the electromagnetic shielding effectiveness were analyzed. The results show that the clothing style, seam gap, test location, dummy model stuffing with absorbing materials, and the polarization direction of electromagnetic field were found as the factors affecting the shielding effectiveness, especially the clothing style and seam gap. The shielding effectiveness went higher in the sequence of vest, coat, split suit to conjoined suit. When conductive fabric patches were applied to the abdominal seam gap of split suits, the shielding effectiveness was greatly improved. After filling the back of the dummy model with an absorbing material to eliminate the multiple electromagnetic reflections in the resonator, the shielding effectiveness of the test was also improved. The effect of opening on shielding effectiveness was proved not significant, when the neckline and cuff were tightly designed. Due to the influence of the seam direction of clothing, there are differences in shielding effectiveness for vertical and horizontal polarization of electromagnetic waves.

Key words: electromagnetic protecting clothing, clothing style, shielding effectiveness, dummy model

CLC Number: 

  • TS102

Tab.1

Fabric parameters of electromagnetic protective clothing"

防护服织物结构 颜色 材料 面密度/(g·m-2) 电导率/(S·m-1) 平均屏蔽效能/dB
外层 蓝色 涤/棉织物 200 — —
中间层 金属色 镀铜镍织物 75 105 55(2~18 GHz)
里层 蓝色 涤纶织物 65 — —

Fig.1

Test pictures of wearing electromagnetic protective clothing"

Fig.2

Installation position of mini double ridge horn antenna in human model. (a) Whole body picture;(b) Head; (c) Chest; (d) Abdomen"

Tab.2

Reflection loss of absorbing materials in range of 1-50 GHz"

频率/GHz 反射损耗/dB 频率/GHz 反射损耗/dB
1 10 6 23
2 13 10 26
3 20 18 28

Fig.3

Shielding efficiency of chests with different clothing structures. (a) Vest and coat;(b) Split and integrated clothing"

Fig.4

Shielding efficiency of abdomen with different clothing structures. (a) Coat; (b) Split and integrated clothing"

Tab.3

Average shielding efficiency of same testing site for different garment styles"

测试
部位		 服装
款式		 屏蔽效能/dB
未填充吸波材料 填充吸波材料
胸部 马甲 14 23
大褂 28 37
分体服 26 31
连体服 31 41
下腹部 大褂 30 35
分体服 30 39
连体服 15 14
头部 连体服 28 27

Fig.5

Shielding effectiveness of coat (a) and split suits (b) on chest and lower abdomen"

Fig.6

Shielding effectiveness of head, chest and lower abdomen of conjoined suit"

Fig.7

Shielding fabric adhering seam diagram of protective clothing. (a) Shielding fabric long strips; (b) All over body are covered with shielding fabric"

Fig.8

Effect of gaps on shielding efficiency of connected suits. (a) Chest; (b) Abdomen"

Fig.9

Influence of garment accessories on shielding effectiveness. (a) Chest; (b) Abdomen"

Fig.10

Shielding efficiency of coat under different polarization conditions. (a) Chest; (b) Abdomen"

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