新型超宽带sirs低通滤波器的设计毕设论文.doc

合肥师范学院2013届本科论文（设计） PAGE  PAGE   PAGE \* MERGEFORMAT 1 3 装 订 线 本科生毕业论文（设计） 题目：新型超宽带SIRs低通滤波器的设计  PAGE \* MERGEFORMAT I 新型超宽带SIRs低通滤波器的设计 摘 要 现如今，由于无线通信技术发展的速度如此之快，所以研制小型化、高性能、低成本的微波电路已经成为了面临的一项极其紧急的任务。目前，作为一个重要的器件，微波电路被应用在无线电台、微波通信、移动通信、卫星通信、无线宽带、航天器与地球之间的遥测、遥控及通信、无绳电话机等中，因此整个通信系统的性能指标会受微波电路的性能影响。随着科学技术的进步，工程设计和市场竞争的趋势将是设计重量轻、小体积、高性能、低成本的射频、微波滤波器以及其它器件。 本论文主要对微带低通滤波器进行设计和研究，其理论依据分别是阶跃阻抗(SIR)、Richards变换、DGS结构(Defected Ground Structure)。本文设计的SIR滤波器采用的普通板材，滤波器的尺寸精度要求相对较低，具有设计和加工简单方便的，同时滤波器各项性能参数好的特点，具有非常好的应用前景。 关键词:微波滤波器 低通滤波器 阶跃阻抗 小型化 PAGE \* MERGEFORMAT II Abstract At present, the development of wireless communication technology is very fast, to develop small ，high performance and low-cost microwave circuits has become a pressing task. In the systems of microwave communications and satellite communications and radar navigation microwave filters is one of the important devices, whether its performance is good or bad will often has a direct impact on the performance of the communication system. With the fast development of science, new materials and new technology is designing small size, light weight, high performance and low-pass RF/microwave filters and other devices will be the trend of engineering design and market competition. In this paper is aimed to design a low-pass filer, its theoretical is the fractal theory, Richards transformation and DGS (Defected Ground Structure).SIR filter designed in this paper USES the ordinary plate, the size of the filter accuracy requirement is relatively low, with simple design and processing, at the same time filters all the performance parameters of good characteristics, has the very good application prospect. Key words: microwave filter low pass filter stepped impedance small  PAGE \* MERGEFORMAT III 目 录 一 绪论 1.1 研究背景与意义 1 1.2 应用于无线通信中的谐振器和滤波器的分类………………