时域有限元法电磁散射特性分析  

Analysis of Electromagnetic Scattering Characteristics with Time-domain Finite Element Method

作　　者：平兰兰 吴东升 甘桂华 PING Lan-lan;WU Dong-sheng;GAN Gui-hua(School of E&IE,Anhui JianZhu University,Hefei 230601,China;School of Electronic Engineering,National University of Defense Technology,Hefei 230036,China)

机构地区：[1]安徽建筑大学电子与信息工程学院,安徽合肥230601 [2]国防科技大学电子对抗学院,安徽合肥230036

出　　处：《枣庄学院学报》2020年第5期11-17,共7页Journal of Zaozhuang University

基　　金：安徽省教育厅自然科学研究项目(项目编号:KJ2016JD11).

摘　　要：时域有限元方法(TDFEM)在处理不均匀媒质和复杂几何体方面有着明显的优点,广泛应用于电磁仿真领域.本文应用了TDFEM的体激励总场-散射场区域分解技术(VETSFD),研究了二维金属目标、介质涂覆目标及金属机翼等典型目标电磁散射特性,计算其雷达散射截面(RCS).鉴于计算结果与时域有限差分算法(FDTD)、文献数据有着较强的一致性,从而验证了该算法的准确性.在此基础上,进一步对该算法的稳定性和计算精度进行了分析,得出了时间步的合适值及目标、总场与散射场之间距离的合适范围,为今后三维模型分析奠定了理论基础.Time Domain Finite Element Method(TDFEM)is widely used in electromagnetic simulation because of its obvious advantages in dealing with heterogeneous media and complex geometry.In this paper,the electromagnetic scattering characteristics of typical targets such as metal targets,dielectric coated metal and metal airfoil are studied and the Radar Cross Section(RCS)is calculated by using the Volumetric Excitation Total-Scattered Field Decomposition(VETSFD)of TDFEM.In view of the strong consistency between the numerical results and the Finite Difference Time Domain method(FDTD)or reference results,the accuracy of the algorithm is verified.On this basis,the stability and accuracy of the algorithm are further analyzed.The appropriate value of the time step and the appropriate range of the distance between the total field and the scattered field are obtained,which lays a foundation for the future 3D model analysis.

关 键 词：体激励 时域有限元 电磁散射特性 雷达散射截面 

分 类 号：O441.4[理学—电磁学]