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

为了避免采用金属频率选择表面制备的天线罩中存在的热残余应力和弱黏接界面等问题，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频率选择表面，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频率选择表面的电磁传输机制和电磁传输影响因子进行分析。结果表明：碳纤维复合材料频率选择表面具有频率选择功能，但谐振频率处的电磁传输损耗较大；通过改变复合材料频率选择表面的单元缝隙率、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。
There are problems, such as thermal residual stress and second bonding layers, in radome which is prepared by metal FSSs (frequency selective surfaces). To avoid these disadvantages, carbon fiber fabric/epoxy composite which has good compatibility with radome wall structure of polymer composite was adopted to prepare FSSs; the free space method was carried out to evaluate the electromagnetic transmission characteristics of the composite FSS specimens; the numerical analysis model was employed to analyze the electromagnetic transmission mechanism and influencing factors of FSS. Results show that: the composite FSS with carbon fiber can realize the function of frequency selection, while the transmission loss at the position of resonance frequency is great; the electromagnetic transmission performance of composite FSS can be adjusted by changing the aperture-to-cell ratio, thickness, conductivity and dielectric constant. 