基于有限元算法的戴罩天线辐射特性快速求解

Fast Analysis of Radiation Characteristics by FEM Algorithm in the Presence of Radome

提出一种基于矢量有限元算法来分析天线罩与天线系统辐射特性的等效方法。在传统有限元方法中,需对整个求解区域进行网格剖分。由于天线局部细小结构的电尺寸与整个求解区域有较大的差距。因此,在网格划分时容易导致剖分奇异性的出现以至于无法顺利剖分或矩阵无法求解。为避免上述问题并提高计算效率,文中将原求解区域进行区域分解,天线在子区域中单独求解,再将子区域边界得到的场值提取出来,同其他求解区域进行耦合,求解耦合矩阵,从而得到整体区域的场值,然后计算所需的增益等辐射参数。并快速准确地得到整个系统计算模型的辐射特性。

This paper presents an equivalent method based on vector finite element method to analyze the radiation characteristics of the antenna in the presence of radome.By the conventional finite element method,the entire solution region should be meshed.As there is a big gap between the electrical size of the local fine structure of the antenna and the entire solution region,mesh singularity often occurs,in which case we can not successfully mesh or the matrix cannot be solved.To avoid such a case and improve the computational efficiency,firstly,the authors simulate antenna model separately and obtain the radiation pattern in Project 1.Subsequently,we extract the electric field values on the radiation boundary in Project 1 and saved them as equivalent radiation sources in Project 2.Then,we set the equivalent radiation sources and radome together and do the simulation.In this way,we obtain the radiation characteristics of the computational model of the entire system fast and accurately.