| Related information reports that electromagnetic radiation has became the fourth pollution source after atmospheric pollution, water pollution and noise pollution with modern industry and communication technology speedy developing. The damage of electromagnetic radiation can no longer been ignored. The demand for electromagnetic shielding is becoming increasingly in daily life. Electromagnetic shielding fabric become as a new type of electromagnetic material which has low cost and good structural plasticity. So it can be promoted easily in daily life. Fabric gets electromagnetic shielding performance through blending conductive material with fiber or fabric by weaving, plating,etc. Fiber and fabric, as the carriers of electromagnetic shielding performance, affects the wearability and the electromagnetic shielding performance of electromagnetic shielding fabric. References can be provided for choosing the carrier fabric of electromagnetic shielding fabric by exploring the main influence factors and analyzing the influence rules of clothing fabric on electromagnetic shielding performance. Therefore, the study of clothing fabric on electromagnetic shielding performance has important guiding significance for developing the electromagnetic shielding fabric with excellent shielding performance and wearability.In this paper, clothing fabrics are taken as research objects. Laboratory samples are selected based on market research and the demands for electromagnetic shielding fabric design. In order to evaluate the electromagnetic shielding performance of samples accurately, a semi-anechoic box testing equipment is designed and manufactured base on GJB 6190-2008 and its test results are compared with the one of the method of coaxial flange. The results show that the coaxial flange is more accurate and is more suitable for the testing of clothing fabrics’shielding effectiveness. So coaxial flange is used to test all the samples’ shielding effectiveness in this paper.To explore the main influencing factors of clothing fabric on electromagnetic shielding performance, the electromagnetic shielding mechanism of clothing fabric is analyzed based on electromagnetic shielding theory and the characteristics of textile materials. The results show that the basic parameters of fabric, fabric weave and fiber species are the main influencing factors. Influence rules of each influencing factors are analyzed after then.Basic parameters of fabric includes too many factors. Because of this case, factors analysis is used to reduce dimensions. Two principle factors of thickness factor and tightness factor are extracted. The relationship between standardized shielding effectiveness and the score function of main factor is analyzed. The results show that the electromagnetic shielding performance of clothing fabric increases linearly with thickness factor increasing and increases firstly then decreases with tightness factor increasing. The thickness factor and tightness factor comprehensive influence is analyzed by using the composite score function. The results show that the electromagnetic shielding performance of clothing fabric increase linearly with composite score increasing. Based on the influencing rules of basic parameters of fabric, SE/thicknessxtightness is used to evaluate the shielding performance and the influencing rules of fabric weave and fiber species are analyzed. Under the same conditions, the electromagnetic shielding performance of the twill fabric is superior to that of plain fabric, the electromagnetic shielding performance of the cotton fabric is the best, that of the nylon fabric is the next and that of the polyester fabric is the weakest.
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