小型化宽频带微带天线的研究（毕业论文）.doc

摘 要 在国际高技术竞争日益激烈的今天,高性能计算技术是一个国家科技实力的体现。而在电磁场与电磁波领域，以高性能计算机技术位依托，电磁场理论为基础，产生了一个重要的领域——计算电磁学。 FDTD作为计算电磁学中的一个重要手段，对于复杂问题物体的电磁仿真是很直接的、很有效的，而且简单方便。当被观察物体变得比较大时，FDTD仿真中需要计算机存储的矩阵将变得极大，这样会受到计算机内存的限制以及计算时间也将限制FDTD的应用。因此本论文讨论了对于将大型域或者复杂介质的域进行区域分解以解决电大尺寸物体的电磁特性仿真的问题。即将整域分解为几个子域，再对每个子域单独迭代，再进行各个子域之间的信息交换，既降低了对计算机内存的需求，也能实现FDTD方便快捷的特性。 本论文研究的主要内容是基于区域分解的时域有限差分法的研究与实现。本论文的切入点是简单的无限长平行双板中插入了无限长的矩形柱，通过这一基本模型进行两个矩形子域的迭代、插值以及电磁特性的仿真。通过采用数值模拟的方法，对实现基于区域分解的时域有限差分法进行分析。 关键词：FDTD 区域分解 ABSTRACT Ⅱ Ⅱ ABSTRACT One of humans greatest natural resources is the electromagnetic spectrum and the antennas have been instrumental in harnessing this resource. An antenna is a device that provides a transition from a guided wave on a transmission line to a “free-space” wave (and vice versa in the receiving case). The rapid progress in communication technologies demands the integration of more than one communication systems into a single compact module. This indicates that the future communication terminal antennas must be compact and meet the requirements of multi-band or wideband to sufficiently cover the possible operating bands. The conventional microstrip antennas (MSAs) possess the advantages of the low weight, the low-profile, and the conformability. However it suffers from the disadvantage of the narrow bandwidth. The technology of miniaturization in the condition of increasing the bandwidth of a MSA is an interesting research. The main content of this thesis is about compact wideband MSAs. And the point of penetration is the regularly shaped broadband MSAs which is the simplest and widely used MSA configuration we research. We analyzed it from the aspects of both miniaturization and frequency bandwidth extension by numerical simulation. . Index Terms: microstrip antennas, miniaturization, frequency bandwidth extension. 目录 Ⅲ 目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc231835010 摘 要 Ⅰ HYPERLINK \l _Toc231835011 ABSTRACT Ⅱ HYPERLINK \l _Toc231835012 第1章 引言 PAGEREF _Toc231835012 \h 1 HY