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《Chinese Journal of Material Research》 2002-05
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ZHANG Xiaoning MAO Qianjin WANG Qun(The Key Laboratory of Advanced Functional Materials, Ministry of Education, Institute of Materials Science and Engineering, Beijing Polytechnic University, Beijing 100022)  
The shielding characteristic of two-layer and three-layer shielding materials was analyzed based on the multilayer electromagnetic shielding theory of Schelkunoff. The sandwich-type material design and the superiority of the material performance were investigated via theoretical calculation, testing of shielding effectiveness (SE), and observation of microstructure by SEM. Results show that the sandwich-type electromagnetic shielding materials can be used to achieve structural optimization, and the increment of shielding effectiveness (SE) increases with the electromagnetic wave frequency; the ASE of the tinsel-sandwich-type electromagnetic shielding materials coincides with the result of theoretical calculation. The SE of coating-sandwich-type electromagnetic shielding materials is higher than that of coating-normal-type. When the frequency point is 1 GHz, the SE of coating-sandwich-type is 18 dB higher than that of coating-normal-type.
【Fund】: 北京市自然科学基金重点资助项目2991001
【CateGory Index】: TB34
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