含磁性金属纤维的多层雷达吸波材料的设计

提出了一种设计多层雷达吸波材料的方法。在使用普通的损耗材料进行设计时，很难在低频段获得较低的反射率。磁性金属纤维在低频段比普通损耗材料具有更大的磁导率，此前还没有包含磁性金属纤维的吸波材料的设计。文中的设计将磁性纤维作为一层，其他层由普通的损耗材料构成，利用设计的一个程序对这几层材料的参数和厚度进行了优化，该程序利用了改性的遗传算法。得到的结果显示出反射率在低频段有了明显的改善(−8 dB对比普通设计的−3 dB)。此设计提供了一种获得优良吸波材料的方法。In this paper, we present a method for designing multilayer-radar-absorbing material. Generally, low reflectance within low frequency band is difficultly obtained by using ordinary lossy material. Magnetic metal fiber may have larger permeability at low microwave band than ordinary lossy materials have, but until now, no design has been performed for absorbing material containing magnetic fiber. We design the absorbing material by using magnetic fiber composite as a layer together with several ordinary material layers. The parameters and thicknesses of these layers are optimized by a modified genetic algorithm. The obtained results show that the reflectance at low frequency have been improved considerably.