基于时域有限差分（FDTD）法的通用电磁仿真软件设计

【作者】 闫淑辉；

【导师】 王秉中；

【作者基本信息】 电子科技大学 ， 无线电物理， 2003， 硕士

【摘要】 随着电磁理论的发展和计算机性能的不断提高，计算电磁学在最近几年得到了长足的发展。其中，时域有限差分（FDTD）法由于其独特的性能和优点得到了越来越广泛的应用和重视。而基于时域有限差分法的电磁仿真软件也得到了相应的发展。论文第一章首先概述了国内外目前基于时域有限差分法相关软件的发展状况，对各软件的内外部结构及特点做了比较和分析，然后对本课题组开发的仿真软件（GEMS）的前期版本进行了简单介绍，并指出其不足之处，说明该课题工作的意义和特点。第二章简单介绍了软件所基于的时域有限差分(FDTD)算法基本原理，并对软件中所用到的一些相关技术，如介质曲面处理、金属曲面处理、非均匀网格的划分及对有耗媒质的模拟给出了详细的说明。第三章主要从软件的外围界面及内核计算模块来分别介绍软件设计时所遵循的基本原则和对问题的处理流程，对软件一些基本功能给出了介绍，使用户更深入地了解软件。在第四章通过对一环形微带谐振器的仿真，向用户演示了该软件的具体使用流程。众所周知，软件测试是软件工程必不可少的重要环节，因此在论文的第五章选择了几个具有代表性的实例对软件进行了测试，并对结果进行了分析和评价，指出了软件的某些不足之处。最后结论包括了本文的工作总结以及对后期工作的思考。更多还原

【Abstract】 With the accelerative growth of high-performance computers, a great progress of computational electromagnetics has been recently achieved. Among all the methods, the Finite-Difference Time-Domain (FDTD) method attracts more and more attention because of its features, and some FDTD- based simulation software have also been developed.In this thesis, firstly, we make a concise comparison and analysis of the popular FDTD software, introduce the electromagnetic simulation software (GEMS) developed by our group, and present the shortage of this software to show the mission of this thesis. Chapter 2 presents the principle of the algorithm, including its four key techniques: curved metallic surfaces, curved dielectric surfaces, non-uniform mesh, and treatment for lossy dielectric. In order to make users know more about the whole process and the logic of the software, the design of the whole software from graphical user interface to computational module are described in Chapter 3. In the following chapter, through an example of circular microstrip resonator we show user how to apply the software to simulate an electromagnetic structure. Then in chapter 5 some examples are presented to illustrate the application of this software, and some advice for improving this software in the future is given through analyzing the results. Finally, the whole work of this thesis is concluded.更多还原