摘要CTS天线技术在上世纪90年代初期经休斯飞机公司的开发而引起业界的广泛关注。同轴CTS天线这种天线提供了很多的优点。由于在设计圆柱辐射元的时候没有方位上的依赖，所以在辐射元平面它可以提供全方位的辐射。第二点，同轴线这种设计在先天上就更加容易实现阻抗匹配，因此他可以提供更高的效率并且便于同其他轴结构相互集成。

然后，本课题所研究的同轴CTS天线也是一种易于双频化设计的全向天线。多频化是现代通信系统中发展的主要方向之一。无论是在公共通信系统，还是卫星通信和RFID方面，多频已经越来越广泛地应用于电子通信中。尤其在最近几年，人们开始需求通信系统的兼容性，而这些功能的载频往往差别很大。因为这些原因同轴天线成为了电子通信领域的热点。

首先，本文通过对同轴CTS天线的初步研究发现，该天线可以从两个方面进行理论分析。其次使用hfss软件对同轴线CTS天线的辐射单元进行研究，对于不同的设计情况可以使用不同的方法加以设计。最后分别设计出高频段和低频段CTS天线，使用匹配网络的方法将两个频段的天线连接起来，并且在仿真的结果中得到了反射S参数和增益。64588

毕业论文关键词：CTS；全向天线；双频天线；天线阵

Abstract CTS technology developed in the early 1990s at Hughes Aircraft Company has attracted research attentions recently. Coaxial CTS structures offer several additional advantages over planar CTS. They provide an omnidirectional radiation pattern in the plane of the radiating stubs (perpendicular to the transmission line)as there is no azimuthal dependence in the designed cylindrical stubs.Secondly, coaxial structures are inherently easier to impedance match,thus providing higher efficiency and facilitate system integration with other coaxial structures.

And,coaxial CTS antenna in this paper is a kind of easy omnidirectional antenna dual-band design.And，more and more attention is paid on multi-frequency technology in modern communication development, for the technique is applied in electronics system, such as public communication system, satellite communication, RFID and so on. Recently, so antennas applied at several frequencies is developed by engineers.

Firstly, after an observation on CTS structure, it is known that the antenna can be analyzed in two aspects. Secondly, CTS element is calculated by HFSS software. For different design situations can be designed using different methods. Finally, two antennas at different frequencies are obtained respectively, and they are connected with matching method,and we can get S parameter and gain from simulation results.

Keywords:CTS; omnidirectional antenna;multi-frequency antenna;antenna array

摘要 3

第一章 绪论 5

1.1研究背景 5

1.2 课题的目的和意义 6

1.3 国内外发展状况 7

1.4 本文的主要研究内容 8

第二章  同轴线CTS天线的原理 9

2.1 同轴CTS天线的结构 9

2.2同轴线CTS结构参数的选取 10

2.3天线电磁场的分析 11

2.4 本章小结 14

第三章 同轴线CTS单元分析与设计 15

3.1同轴线辐射单元的分析与设计 15

3.2天线单元连接 16

3.3阻抗匹配方案