文档介绍：结构无序化对吸波超材料性能的影响
程海峰,庞永强,周永江
(国防科技大学,新型陶瓷纤维及其复合材料国防科技重点实验室,湖南长沙 410073)
摘要: 近年来,超材料由于其独特的电磁响应特性得到了世界各国研究者的关注,并得到了广泛的应用,其中,用于电磁波吸收是研究重点之一。通常情况下超材料由结构单元按照周期排列构成,然而最近无序结构超材料引起了研究者的关注,因为它们表现出了一些比传统周期结构超材料更加优异的性能。为此,本文系统研究了关键结构参数无序化对短切线吸波超材料性能的影响。结果表明,短切线长度的无序化可拓展吸波带宽,为宽带吸波材料的设计提供了一种思路,空间取向的无序化可使得短切线吸波超材料电磁特性由单极化响应向任意极化响应转变,而空间位置的无序化则对吸波性能的影响可忽略不计,在微波频段进行了数值仿真和实验测试的验证,并分析与讨论了无序吸波超材料在工程领域的应用前景。本文发展的方法对其他结构以及频段的吸波超材料也有重要的指导作用。
关键词: 吸波超材料;无序结构;碳纤维
中图分类号:TB 34 文献标识码: A 文章编号:
Influence of disorder on the absorption properties of metamaterial absorbers
Haifeng Cheng, Yongqiang Pang, Yongjaing Zhou
(National University of Defense Technology, Key Laboratory of Science and Technology on Advanced Ceramic Fibers posites, Changsha 410073, China)
Abstract: Metamaterials have attracted considerable attentions due to their engineered ic properties and potential applications. One important application of metamaterials is the development of absorbers with nearly unity absorbance. For convenience of the fabrication, most current metamaterials are realized as periodic arrays. However, random metamaterials have gained a growing interest recently, because they exhibit some more desirable ic properties. Therefore, the influences of disorder on the absorption properties of wire-based metamaterial absorbers were studies here. The numerical and experimental results show that the absorption bandwi