立体结构媒质电磁频响特性的研究  

Study on Frequency Response Characteristics of Three-dimensional Structure Metamaterials

作　　者：吴禄军[1] 姚卓民[1] 李乔[1] 赵云[1] 李娟[1] 

机构地区：[1]中国电子科技集团公司第二十七研究所,郑州450047

出　　处：《电光系统》2014年第3期58-63,共6页Electronic and Electro-optical Systems

摘　　要：随着天线雷达隐身技术的发展，立体周期结构吸波材料被广泛应用在各种隐身技术中。但是，对立体周期结构电磁频响特性的分析存在一定的难度。本文采用等效电磁参数理论方法，结合复合二相介质材料的占空比公式推导了电磁波在立体周期结构中的反射系数和透射系数公式，进一步求解了两种不同立体结构中结构占空比一致情况下的反射率随频率变化曲线。与仿真计算对比发现，该等效电磁理论方法对分析立体周期结构中电磁波的频响特性具有一定的可行性；通过改变立体结构高度，验证了采用长波近似下的等效电磁参数理论方法分析立体周期结构在低频时吻合的比较好，而在高频段存在一定的差异。这些结论对分析立体周期结构电磁频响特性的研究具有一定的指导意义。With the development of antenna radar stealth technology, three-dimensional periodic structures absorbing materials are widely used in a variety of stealth technologies. However,there are some difficulties in the analysis of three-dimensional periodic structures electromagnetic frequency response characteristics. In this paper,based on the equivalent electromagnetic parameters theory,the formulae for reflection coefficient and transmission coefficient of electromagnetic waves in three-dimensional periodic structure are derived from the duty radio formula of composite twophase medium material,and the graph of the variation of reflectivity with frequency is further solved with the same structure duty ratio in two different three-dimensional periodic structures. Compared with the simulation computation, the results obtained show that the equivalent electromagnetic parameters theory is feasible in the analysis of frequency response characteristics of electromagnetic wave in three-dimensional periodic structure;by changing the height of three-dimensional structure,the results obtained validate that： the equivalent electromagnetic parameter theory trader long wave approximation is a good approach to analyze three-dimensional periodic structure in low frequency,while there are some differences in high frequency. These conclusions provide some guide for the analysis of frequency response characteristics of three-dimensional structure.

关 键 词：等效电磁参数 反射系数 立体结构 占空比 

分 类 号：O441.6[理学—电磁学]