螺旋结构人工电磁媒质的优化设计  

Optimization and Design on Helical Structure Metamaterial

作　　者：韩井玉[1] 王群[1] 唐章宏[1] 施楣梧[2] 肖红[2] 

机构地区：[1]北京工业大学材料科学与工程学院 [2]中国人民解放军总后勤部军需装备研究所

出　　处：《安全与电磁兼容》2011年第3期14-16,共3页Safety & EMC

摘　　要：针对螺旋结构人工电磁媒质,分析了利用螺旋结构实现结构吸波的原理,并通过对螺旋结构周围的电场分析、对原有的螺旋结构的改进,显著提高了这种结构的吸波效能。最后,利用遗传优化算法对螺旋的半径与螺旋的旋间距的比值进行优化设计。结果表明,当螺旋半径与螺旋间距的比值为0.15时螺旋结构的吸波效能最好,而且在2～18 GHz的频带内反射系数小于-5 dB的带宽接近10 GHz。The absorbing mechanism of helical structure metamaterial was analyzed according to the electromagnetic theory.The original helical structure was improved by analyzing the distribution of electric field inside the structure.Therefore,the absorption effectiveness of new structure improved greatly.Furthermore,the improved helical structure was optimized by genetic algorithm（GA）.The results showed that when the ratio of radius and pitch of helical structure closed to 0.15,the helical structure metamaterial could obtain best absorption effectiveness,which reached to more than 10 GHz bandwidth with reflection coefficient less than-5 dB in the range of 2~18 GHz.

关 键 词：螺旋结构 遗传优化算法 吸波效能 

分 类 号：TB34[一般工业技术—材料科学与工程]