一种周期材料电磁波特性实验研究

Experimental Study on Electromagnetic Waves of a kind of Periodical Material

采用金属球和铜线以一定的阵列形式布置在有机玻璃板上组成一种周期材料。通过自由空间法测定了这种周期材料对3.0~18.0 GHz的电磁波的反射和透射特性。结果表明：当材料结构在两层以上时,由于层间的电磁耦合作用,该周期材料在6.3~8.1 GHz范围出现一个通带,且通带宽度随层数的增加而增大,同时对3层以上结构在14.7~18.0 GHz反射波也较小。这些电磁特性表明,该周期材料可应用于电磁屏蔽、雷达波吸收和频率选择表面的设计。

Steel balls and copper lines were selected as metal shielding material.They were mounted into the plexiglass（PMMA） board in a certain form of the rectangular array.Then properties of this cycle of materials′ microwave-absorbing were determined through the free space method.And electromagnetic wave′s frequency was arranged from 3GHz to 18GHz offered by E8362B type of network analysis equipment.The experimental results showed that it emerged a pass-band in the range of 6.3-8.1GHz when more than two layers of this material were applied.The more layers there are,the wider the pass-band could be formed.And the material with more than three layers had strong absorption loss at 14.7-18GHz.All these electrical and magnetic properties illustrated that cycle of material could be used to design electromagnetic shielding,radar absorption and frequency selective surface.