基于ADS微带耦合滤波器的设计

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基于ADS的微带耦合

滤波器的设计 2014年 月 日

目录

摘要................................................................................................................................ I Abstract ......................................................................................................................... II 第一章 绪论.................................................................................................................. 1

1.1 背景.................................................................................................................. 1 1.2 研究意义.......................................................................................................... 2 1.3 设计要求.......................................................................................................... 2 1.4 方案比较与选择.............................................................................................. 3

1.4.1 方案一：基于ADS设计平行耦合微带线带通滤波器 ..................... 3 1.4.2 方案二：基于Designer的多带外零点微带带通滤波器仿真设计 ... 3 1.4.3 方案三：基于FPGA的FIR数字滤波器的设计与仿真 ................... 4

第二章 关于低通滤波器的设计.................................................................................. 5

2.1 低通原型滤波器.............................................................................................. 5

2.1.1 滤波器的基本原理................................................................................ 5 2.1.2 低通滤波器的设计指标........................................................................ 7 2.1.3 低通原型滤波器的设计........................................................................ 7 2.2 低通滤波器原理图设计.................................................................................. 7

2.2.1 仿真参数设置和原理图仿真................................................................ 9 2.2.2 原理图仿真.......................................................................................... 10

第三章 平行微带耦合滤波器的设计........................................................................ 11

3.1 传输线理论.................................................................................................... 11

3.1.1 微带线的结构及传输模式.................................................................. 11 3.1.2 耦合微带线及其传输模式.................................................................. 11 3.1.3 传输线的基本特性参数...................................................................... 12 3.2 微带滤波器的技术指标................................................................................ 14 3.3 平行微带耦合滤波器的设计........................................................................ 14

3.3.1 平行耦合微带线带通滤波器的原理.................................................. 14 3.3.2 设计指标.............................................................................................. 16 3.3.3 生成滤波器的原理图.......................................................................... 17

3.3.4 微带线计算工具.................................................................................. 18 3.3.5 设置微带器件的参数.......................................................................... 18 3.3.6 添加变量.............................................................................................. 19 3.3.7 S参数仿真电路设置 ........................................................................... 20

第四章 电路优化........................................................................................................ 21

4.1 优化目标控件................................................................................................ 21 4.2 参数优化........................................................................................................ 22 4.3 观察仿真曲线................................................................................................ 23

4.3.1 原理图.................................................................................................. 23 4.3.2 原理图的仿真...................................................................................... 24 4.3.3 平行耦合型滤波器的最终设计参数.................................................. 25

结论.............................................................................................................................. 27 参考文献...................................................................................................................... 28 致谢.............................................................................................................................. 30

摘要

滤波器是最基本的信号处理器，滤波器的主要特性包括低通、高通、带通、带阻衰减。微带滤波器是一类被大量使用的微波滤波器[1]。很多型号的滤波器都可以在低通滤波器的原型上转化过来。微带电路拥有频带比较宽、体积较小、质量较轻等较多的长处，所以使用微带做滤波器是其主要应用之一。在文中利用微波滤波器只让频率正确的的信号通过阻碍频率不同的信号的特性来区分信号而设计出具有高性能的滤波器。本文利用微波设计软件ADS全局优化设计[2]，使用软件自带的耦合微带传输线计算器来进行计算，对得出的电路拓扑结构进行仿真，并且对其不理想的地方进行优化处理。这样显然减少了大量繁琐的计算，使得微带耦合滤波器的设计变得简单、精确。结合实用的解决方案对带外抑制和插入损耗进行优化设计，最终得到比较理想的带通滤波器。重点阐述了如何利用ADS软件有效、快速的设计出微带耦合滤波器的设计过程。

关键词：ADS软件；仿真；平行耦合微带线；滤波器

I

Abstract

Filter is the most basic signal processors, the main characteristics of the filter include low pass, high pass, band pass, band stop attenuation. Microstrip filter is a type of microwave filters are heavily used. Many types of filters can be transformed back on the prototype low-pass filter. Microstrip circuit has a relatively wide frequency band, smaller, lighter quality higher strengths, to do so using microstrip filter is one of its main applications. In this paper, the use of microwave filters only allow the correct frequency signal by blocking the signals of different frequencies to distinguish the signal characteristics and high performance filter design. In this paper, global optimization ADS microwave design software design, software comes coupled microstrip transmission line calculator to calculate, on the results of the simulation circuit topology, and its not the ideal place to optimize. So obviously reduces the amount of tedious calculations, coupled microstrip filter design allows easy and precise. Combined with practical solutions for the band rejection and insertion loss to optimize the design, and ultimately get the ideal bandpass filter. ADS focuses on how to use the software effectively, quickly design coupled microstrip filter design process.

Keywords: ADS software; simulation; coupled microstrip lines; Filters

II

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