毕业论文天线微带巴伦的设计.doc

毕业论文天线微带巴伦的设计
毕业论文(设计)
题目天线微带巴伦的设计院系专业年级学生姓名学号指导教师
天线微带巴伦的设计
专业
学生指导教师
【摘要】凭借传输线的阻抗与阻抗匹配的知识和微带天线的传输的理论设计了一类宽带微带巴伦(平衡/非平衡转换器)。相对于传统基于共面波导和共面带状线的微带巴伦而言,所设计的这个新型微带巴伦采用的是低介电常数介质基板制作,它设计的结构精致小巧,并且花费很便宜。我们设计了一个 50Ω非平衡到 50Ω平衡馈电转换的微带巴伦,通过理论的计算,证明了该宽带微带巴伦具备了优异的超宽带特性,可以在从 的频率范围内,计算得到的馈电端口的反射系数都是低于-9dB,插入损耗小于
。
【关键词】宽带微带巴伦共面波导微带天线
I
Design of a Novel Ultra Wideband Microstrip Balun
【Abstract】A novel wideband microstrip balun (balanced to unbalanced
transformer) based on transmission line's impedance,impedance matching and microstrip antenna transmission is with one kind of traditional microstrip baluns, which consists of coplanar waveguide and coplanar strip line, the proposed balun has several advantages such as low-cost, compacted and easy to be fabricated, because it can be fabricated on a substrate with low dielectric constant and it has simple structure without plex slot. As an example, a balun, which can carry out the transformation from the 50Ω unbalanced to the 50Ω balanced mode, is designed. Results of theoretical calculation show this balun possesses quite promising ultra wideband properties. In a very large frequency band ranging from up to , its return loss and insertion loss are lower than -9dB and respectively.
【Key words】 wideband microstrip balun waveguide ground strip line
II
目录
1 序言..................................................................... 1
巴伦的简介......................................................... 1
微带巴伦的工作原理................................................. 1
巴伦的种类......................................................... 2
2 设计概述.................................................................. 4
背景与国内外研究现状............................................... 4
论文主要工作....................................................... 5
论文结构........................................................... 5
3 微带巴伦结构与阻抗计算.............