毕业论文___基于ads的定向耦合器的设计.doc

本科毕业论文（设计、创作） 题目： 基于ADS的定向耦合器的设计 所在系院：电子电气工程学院 专业： 电子科学与技术 基于ADS的定向耦合器的设计 摘要：在20世纪50年代初，几乎所有的微波设备都采用金属波导和同轴线电路，那个时候的定向耦合器也多为波导小孔耦合定向耦合器，其理论依据是Bethe小孔耦合理论定向是微波系统中应用广泛的一种微波器件，它的本质是将微波信号按一定的比例进行功率分配。定向耦合器由传输线构成，同轴线、矩形波导、圆波导、带状线和微带线都可构成定向耦合器，所以从结构来看定向耦合器种类繁多，差异很大。 In twentieth Century the beginning of the 50s, the microwave equipment is used by almost all metal waveguide and coaxial line directional coupler circuit, at that time also many for the waveguide aperture coupling directional coupler, its theoretical basis is the Bethe aperture coupling theory. Directional coupler is a kind of microwave devices are widely used in microwave system, it is the essence of the microwave signal power distribution according to a certain proportion of the directional coupler. Directional coupler is composed of transmission lines, coaxial line, rectangular waveguide, circular waveguide, stripline and microstrip line directional coupler can be formed, so the structure of directional coupler variety, difference is very big. Directional couplers are widely applied in microwave band, its main purpose is to monitor the power, frequency and spectrum, the power distribution and synthesis, a balanced mixer and a bridge, to measure the power reflection coefficient and power by using a directional coupler. This design is mainly using the method of software design of ADS2011 microstrip branch directional coupler, and the use of ADS design, simulation of microstrip branch directional coupler, completes the schematic and layout. Keywords: directional coupler; microstrip branch; ADS; microwave 目录 第一章 绪论 1 1.1 微波技术产生的背景及发展趋势 1 1.2 ADS简介 2 1.2.1 ADS的特点 2 1.2.2 ADS的设计方法 2 1.3 定向耦合概念及分类 3 1.3.1概念 3 1.3.2分类 4 1.3.3 主要技术指标 6 第二章 工作原理 8 2.1 传输线理论 8 2.2 输入阻抗 9 2.3 特性及测量 10 2.3.1网络特性 10 2.3.2测量方法（定向耦合器的特性参量） 11 2.4 定向耦合器的用途 11 第三章 微带分支电路的分析与设计 13 3.1 分支线耦合器 13 3.2 分支线耦合器的奇、偶模分析 13 第四章 设计过程 17 4.1 建立工程 17 4.2 原理图的设计 18 4.3微带线参数的设置 19 4.4 VAR控件的设置 2