FSS对复合吸波材料吸收特性的影响及优化分析

发布时间：2018-03-21 12:28

本文选题：复合吸波结构　切入点：频率选择表面　出处：《北京工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文主要对多层FSS(Frequency Selective Surface,FSS)复合吸波结构的分析计算及优化方法进行了研究。从探究电磁波在复合吸波结构中的传播机理出发,研究复合吸波结构反射系数的广义散射矩阵级联快速求解法,根据各个因素对多层FSS复合吸波结构频响特性的影响规律,利用优化算法设计具有低反射系数、宽吸收频带、较薄厚度的多层FSS复合吸波结构。论文首先将多层FSS复合吸波结构分解为多个独立的子系统,分别研究电磁波在子系统内部、介质内部的传输机理以及子系统界面处的边界条件。基于有限元法和广义散射矩阵级联的理论基础,推导得到多层FSS复合吸波结构反射系数的广义散射矩阵级联快速求解法的计算公式。进一步利用此方法对多层FSS复合吸波结构的具体实例进行分析计算,通过对比全三维数值法的计算结果,验证了广义散射矩阵级联快速求解法的正确性。在以上研究的基础上,论文研究了FSS分别为Y形、十字形和耶路撒冷形时,各个影响参数对复合吸波结构吸收性能的影响规律。首先设计一种十字形FSS结构单元,叠加到两层吸波材料中组成复合吸波结构,通过分析复合吸波结构的频响特性,验证了FSS可以明显拓宽复合结构的吸波带宽、增强吸收性能。进一步研究介质厚度、FSS尺寸、不同极化方式下入射角度等参数对复合结构吸收性能的影响。为了得到吸收性能比较理想的复合吸波结构,基于各个影响参数对多层FSS复合吸波结构反射系数的影响规律,合理设置各个参数的边界值,利用差分进化算法对两层FSS复合吸波结构的各个参数进行优化设计,得到了在工作频段范围内,吸收性能良好的复合吸波结构。
[Abstract]:This paper focuses on the multi FSS (Frequency Selective Surface, FSS) composite absorption calculation and optimization method are analyzed. From the research on the electromagnetic wave structure of wave absorbing composite wave propagation mechanism in structure, study the generalized scattering matrix composite absorbing reflection structure coefficient with fast solution method, according to the influence of various factors on the multilayer FSS composite microwave frequency response characteristics of wave structure, using optimization algorithm with low reflection coefficient, wide absorption band, multilayer FSS composite wave absorbing structure with thin thickness. Firstly, the multilayer FSS composite absorbing structure is divided into several independent subsystems respectively on the electromagnetic wave in the subsystems, and sub the system boundary conditions at the interface transmission mechanism inside the medium. The theoretical basis of finite element method and the generalized scattering matrix is deduced based on cascaded, multilayer FSS composite absorption coefficient generalized reflection structure The calculation formula of the scattering matrix of the cascade fast solution method. Further by using the method of multilayer FSS composite absorbing concrete example wave structure analyzed by calculation results of numerical method, verified the correctness of the generalized scattering matrix cascading fast solution method. In the research on the basis of the research of FSS respectively. Y shaped cross and Jerusalem, the impact of various parameters on composite absorbing structure absorption capability are analyzed. The first design of a cruciform structure units of FSS, added to the composite wave absorbing structure of two layer absorbing materials, through the analysis of the frequency response characteristics of wave absorbing composite structure, FSS can be verified obviously broaden the absorbing bandwidth of composite structure, enhanced absorption performance. Further study of medium thickness, the size of FSS, the influence of different polarizations of incident angle and other parameters on the absorption properties of composite structures in order to get. The absorption properties of composite absorbing structure is ideal, the impact of various parameters affecting the regularity of multilayer FSS absorbing composite structure based on reflection coefficient, a reasonable set of parameters of the boundary value, using the differential evolution algorithm of two layer FSS composite absorption parameters of wave structure optimization design, has been working in the frequency range. Absorption of composite absorbing structure with good performance.

【学位授予单位】：北京工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB34

【共引文献】