摘要随着微波集成电路系统结构的复杂程度变高，不可避免的在同一个电路系统中运用到多种平面传输线，其中最常被使用到的是微带线-微带线的垂直过渡结构和微带线-共面波导的过渡结构。本文针对这两类常用的过渡结构进行了创新研究。
    本文设计的微带线到微带线的垂直过渡结构分为两个部分，第一个部分主要由输入输出端口、短截微带线和四分之一波长微带线支节构成，第二个部分是槽线形式的阶梯阻抗谐振器。仿真结果表明，合适的高特性阻抗槽线支节长度可以同时实现较宽的带宽和好的阻抗匹配。且该过渡结构可以在回波损耗小于10dB的情况下实现2.3GHz-14GHz的较宽的带宽，通带内插入损耗小于2dB。设计的微带线到共面波导的过渡结构主要由微带环、环形共面波导和短路支节构成，为了获得更大的带宽又在过渡结构中加入了短路支节，结果可以实现2.6GHz到12.2GHz的带宽，通带内插入损耗小于1.7dB。本文设计的两类过渡结构具有结构紧凑，宽带宽，插入损耗低等优点。20321
关键字： 微带线、共面波导、过渡结构、阶梯阻抗谐振器
毕业论文设计说明书（论文）外文摘要
Title    Design of broadband  microstrip line transition      
 Abstract
As the circuit structures of the microwave integrated systems become more and more complex, it is inevitable to use various planar circuit transmission lines in the same circuit system. The most commonly used are microstrip-to-microstrip vertical transition structure and microstrip-to-CPW transition structure. In this paper, these two types of transition structures were researched innovatively.
This design of microstrip-to-microstrip vertical transition structure mainly consists of two parts, the first part is the input and output ports and the quarter wavelength microstrip  stub  that  is composed of a short microstrip line and a low impedance stub on the top/bottom layer of the structure. The second part is a half-wavelength slotline SIR on the common ground. Simulation results show that suitable high characteristic impedance slotline stub length can realize wide bandwidth and good impedance matching. The transition structure can achieve a wide bandwidth transition of 2.3GHz - 14GHz with the loss of less than 10dB, and the insertion loss in the passband is less than 2dB. The microstrip-to-CPW transition structure consists of a main microstrip ring, a circular CPW, and a short-ended stub. In order to obtain more bandwidth, the short-ended stub is adopted in the transition section, the advanced structure can achieve a bandwidth of 2.6GHz to 12.2GHz, and the insertion loss is less than 1.7dB.
Keywords:  microstrip line、CPW、transition structures、stepped-impedance resonator(SIR)
 目次
1 引言    1
1.1 本课题的研究背景、现状和展望    1
1.2 微带线的过渡结构介绍    5
1.2.1微带线到微带线垂直过渡结构    5
1.2.2 微带线到共面波导（CPW）的过渡结构    5
1.3 仿真软件介绍    6
1.4 论文的主要结构    7
2 微波传输线及过渡结构的原理    8
2.1 传输线的基本理论    8
2.1.1 微带线的基本理论    8
2.1.2 共面波导的基本理论    9
2.2 阻抗匹配    11
2.3 微带线过渡结构理论    13
2.3.1 微带线-微带线垂直过渡结构理论分析    13
2.3.2 微带线-共面波导过渡结构理论分析    14
2.4本章小结    16
3 两种过渡结构设计    16 宽带微带线过渡设计+文献综述:http://www.751com.cn/tongxin/lunwen_12056.html