碳纤维增强聚合物基复合材料频率选择表面的电磁传输特性（复合材料专栏投稿）*

为了改善采用金属频率选择表面（Frequency Selective Surface，FSS）制备的天线罩中存在的热残余应力和弱粘接界面等问题，本文采用与聚合物基复合材料罩壁结构相容性好的碳纤维增强聚合物基复合材料制备FSS，利用自由空间法对试样的电磁传输性能进行测试，并采用数值分析模型对碳纤维复合材料FSS的电磁传输机制和电磁传输影响因子进行分析。结果表明：碳纤维复合材料FSS具有频率选择功能，但谐振频率处的电磁传输损耗较大；通过改变复合材料FSS的单元缝隙率、厚度、电导率以及介电常数可以实现对其电磁传输性能的调节。

Electromagnetic transmission characteristics of frequency selective surfaces with carbon fiber fabric/epoxy composite

Traditional FSSs were made of metals, such as cooper and aluminum. There were problems when the FSSs were used with composite structures, such as thermal mismatch and second bonding layers. To avoid these disadvantages, carbon fiber fabric/epoxy composite FSSs were put forward in this study. A four-legged slot array composite FSS was fabricated by cutting carbon fiber/epoxy composite panels. Free space method and finite integral method were carried out to evaluate the electromagnetic transmission characteristics of the composite FSS specimens, respectively. Results show that the composite FSS with four-legged slot array can realize the function of frequency selection and its minimum transmission loss can be decreased by increasing the electrical conductivities of the composite material, adjusting the thickness and increasing the aperture-to-cell ratio of it.