三明治型电磁屏蔽材料的制备与性能

根据Schelkunoff的多层电磁屏蔽理论，分析了双层和3层屏蔽材料的综合屏蔽特征，提出了一种简单有效的三明治型夹层结构材料设计方案，制备出金属箔、涂料两种三明治型层状电磁屏蔽材料，通过理论计算、样品的综合屏蔽性能测试和SEM微观组织观察，讨论了三明治型材料设计方案的正确性与材料的性能。结果表明，三明治型电磁屏蔽材料的屏蔽效能增量（△SE）随电磁波频率的增加而增大，可以实现结构优化；金属箔三明治型电磁屏蔽材料的屏蔽效能增量与理论计算结果相符合；涂料三明治型电磁屏蔽材料的SE值比普通型高，当入射电磁波的频率为1GHz时，三明治型比普通型高18dB。

PREPARATION AND CHARACTERISTICS OF SANDWICH-TYPE ELECTROMAGNETIC SHIELDING MATERIALS

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.