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摘要带阻滤波器在射频和微波应用中发挥着重要的作用。带阻滤波器可以满足在某个频率提供较高衰减的要求，以弥补带通滤波器的不足。随着无线通信系统应用的发展，滤波器面临着更加严峻的挑战。性能好、尺寸小、重量轻以及成本低的微带滤波器受到越来越多的关注。41878
本文基于微带滤波器的优点设计了一款微波带阻滤波器。论文首先对带阻滤波器的国内外发展情况进行了说明，引出本文的微带滤波器结构。接着介绍了微带线理论和二端口网络。对设计过程中经常使用的HFSS和ADS等软件进行了介绍。最后介绍了带阻滤波器的设计方法，该滤波器设计使用低通原型到带阻转换的方法。仿真结果显示，此方法设计的带阻滤波器有较宽的带宽，带阻性能也较好，能满足设计的要求。
关键词 带阻滤波器 低通原型 微带传输线 损耗
毕业论文设计说明书外文摘要
Title Design of Band-stop Microstrip Filter Based On HFSS
Abstract
Band-stop filter plays an important role in RF(Radio Frequency)and microwave applications. Band-stop filter can meet the requirements of providing high attenuation at some frequency bands in order to make up for the inadequacy of band-pass filter. With the development of wireless communication system applications, filter is facing more severe challenges. Microstrip filters with good performance, small size, light weight and low cost are attracting more and more attention.
This article designs a microstrip band-stop filter based on the advantages of microstrip filters. This paper firstly illustrates the development situation of band-stop filters at home and abroad, leading to the designed microstrip filter structure. Then the theory of microstrip line and two-port network are introduced. The occasionally used HFSS and ADS softwares in the design process are also introduced. Finally this paper introduces the design method of band-stop filter, and the filter design utilizes low-pass prototype to band-stop transformation method. The simulation results show that this method design of band-stop filter has wide bandwidth, and the band-stop performance is also better, which can meet the design requirements.
Keywords Band-stop filter，Low-pass prototype， Microstrip transmission line， Loss
目 次
1 绪论 1
1.1 研究背景及意义 1
1.2 国内外研究现状 2
1.3 论文主要工作内容及安排 2
2 基础理论与软件简介 3
2.1 微带线理论 3
2.2 二端口网络 5
2.3 仿真软件HFSS介绍 8
2.4 本章小结 9
3 微波带阻滤波器设计基础 10
3.1 滤波器的分类和主要指标 10
3.2 低通原型至带阻滤波器的转换 12
3.2.1 滤波器低通原型 12
3.2.2 低通至带阻的转换 13
3.3 带阻滤波器变换重要定理 14
3.3.1 Richards变换 14
3.3.2 单位元件 14
3.3.3 Kuroda变换法则