唐章宏
螺旋结构人工电磁媒质的优化设计
Optimization and Design on Helical Structure Metamaterial
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。
关键词 螺旋结构;遗传优化算法;吸波效能
Abstract The absorbing mechanism of helical structure metamaterial was analyzed
according to the electromagnetic theory. The original helical structure was improved
according to 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 2~18GHz.
Keywords helical structure; genetic algorithm (GA);absorption effectiveness
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