提出了一種設(shè)計(jì)多層雷達(dá)吸波材料的方法。在使用普通的損耗材料進(jìn)行設(shè)計(jì)時(shí)，很難在低頻段獲得較低的反射率。磁性金屬纖維在低頻段比普通損耗材料具有更大的磁導(dǎo)率，此前還沒有包含磁性金屬纖維的吸波材料的設(shè)計(jì)。文中的設(shè)計(jì)將磁性纖維作為一層，其他層由普通的損耗材料構(gòu)成，利用設(shè)計(jì)的一個(gè)程序?qū)@幾層材料的參數(shù)和厚度進(jìn)行了優(yōu)化，該程序利用了改性的遺傳算法。得到的結(jié)果顯示出反射率在低頻段有了明顯的改善(?8 dB對(duì)比普通設(shè)計(jì)的?3 dB)。此設(shè)計(jì)提供了一種獲得優(yōu)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.