关键词: 天线罩;有限元;剖分奇异性;区域分解

Abstract:

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.

Key words: radome;vector finite element method;mesh singularity;equivalent radiation sources