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摘要微带天线是近四十年来飞速发展的一类新型天线，由于其剖面低、体积小、易集成等优点而深受广大天线研究者的亲睐。而利用微带很容易得到在无线通信系统中很重要的圆极化天线，因此更好性能的圆极化微带天线有着重要的研究意义。25856
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本文主要对圆极化微带贴片天线进行了研究，设计了一种结构较为简单的宽带圆极化微带天线。该天线为层叠结构，用同轴线单点馈电。在两层微带天线的圆形辐射贴片上都进行了开C型缝处理，在实现圆极化辐射的同时也能拓宽工作带宽。使用HFSS13.0对天线进行性能分析及参数优化得出，该天线工作于C波段时，3dB轴比带宽达到11.7%， 的相对阻抗带宽为37.5%。
关键词 微带天线 圆极化 C型缝隙
毕业论文设计说明书外文摘要
Title Design of A Broadband Circular Polarization Microstrip Antenna for C-band
Abstract
The microstrip antenna is a new type of antenna, which is developing rapidly in the last forty years. Many antenna researchers are interested in it for its advantage of low profile, low cost, easy integration and so on. And it is easy to get the circular polarized antenna which is very important in the wireless communication system, so the circular polarization microstrip antenna with better performance is of great significance.
This thesis mainly studies the circular polarization microstrip patch antenna, a broadband circular polarized microstrip antenna with relatively simple structure is designed. The antenna is a stacked structure, and feed by single coaxial probe. Embedding a C shape slot in the patch of the two - layer microstrip antenna to achieve circular polarization and the antenna significantly improve the working bandwidth. After analysing the performance of the antenna and parameter optimization with HFSS13.0, when the antenna works in the C band, the bandwidth of 3dB axial ratio is up to 11.7% and the VSWR 2 impedance band can be up to 37.5%.
Keywords Microstrip antenna Circular polarization C-type slot
目 次
1 绪论 1
1.1 研究的背景与意义 1
1.2 国内外研究现状 2
1.2.1 圆极化微带天线小型化技术和研究现状 2
1.2.2 圆极化微带天线宽频带技术和研究现状 2
1.2.3 双频/双圆极化微带天线研究近况 3
2 微带天线理论 4
2.1 微带天线基本理论 4
2.1.1 微带天线的结构及类型 4
2.1.2 微带天线的馈电方式 5
2.1.3 微带天线的优缺点 7
2.2 微带天线的分析方法 7
2.2.1 传输线法 8
2.2.2 腔模理论 9
2.2.3 积分方程法 9
2.3 微带天线圆极化技术 10
2.3.1 天线的极化 10
2.3.2 圆极化天线的特性 12
2.3.3 微带天线获得圆极化的方法 14
3 C波段宽带圆极化微带天线 17
3.1 天线设计 17
3.1.1 天线设计思路 17
3.1.2 天线结构 17
3.1.3 微带天线基底尺寸 18
3.1.4 微带天线贴片尺寸 18
3.1.5 C型缝隙的影响 19