阶跃阻抗微波低通滤波器设计与仿真毕业(设计)论文.doc

阶跃阻抗微波低通滤波器设计与仿真设计总说明微波滤波器在无线通信系统中至关重要，起到频带和信道选择的作用，并且能滤除谐波，抑制杂散。在射频电路设计时，经常会用滤波器从各种信号中提取出想要的频谱信号。AngilentADS软件可以支持从模块到系统设计，能够完成微波电路设计、通信系统设计、射频集成电路设计，因此是当前射频和微波电路设计的首选工程软件。本文主要用三种方法达到了任务书的要求，其具体参数指标为截止频率=2.5GHz;在=4GHz处的插入损耗大于20dB;输入输出阻抗为50，依据理论是巴特沃兹、切比雪夫、Richards变换与Kuroda规则，并得出了三种方法设计的滤波器。利用滤波器向导设计在基于Richards变换与Kuroda规则最低需采用五阶，就可以达到最平坦响应，但其过渡带过于平坦；采用最平坦响应阶跃阻抗低通滤波器原理图设计需要六阶就可以达到设计参数要求，同时该方法设计的滤波器过渡带比采用向导设计的要陡峭；采用切比雪夫设计的滤波器所需节数需五阶，但其通带内会出现波纹。本文的设计结果和结论为微波滤波器的设计提供了重要的理论参考。关键词：ADS，巴特沃兹，切比雪夫，Richards，Kuroda，低通滤波器。Steppedimpedanceofmicrowavelow-passfilterdesignandsimulationDesignDescriptionMicrowavefiltersinawirelesscommunicationsystemisessential,andplayaroleinbandandchannelselection,andharmonic,suppressionofspurious.WhentheRFcircuitdesign,oftenusedfilterwantsspectrumsignalisextractedfromthesignal.AngilentADSsoftwarecansupportfromthemoduletothesystemdesign,abletocompletemicrowavecircuitdesign，communicationdesign,RFICdesign,soisthecurrentchoiceforRFandmicrowavecircuitdesignengineeringsoftware.Thisarticlemainlythreewaystomeettherequirementsofthetask,thespecificparametersforasatfrequencieslowpasscut-offfrequencyof=2.5GHz;insertionlossgreaterthan20dBatthe=4GHzinputoutputimpedanceis50,basedonthetheoryofButterworth,Chebyshev,RichardsrulesoftransformationandKuroda,andthethreemethodsofdesignofthefilter.InbasedonRichardstransformandKurodarulesusingFilterWizarddesignjustusedfourorder,oncanreachedmostflatresponse,butitstransitionwithtooflat;usedprinciplefiguredesignofhasmostflatresponseorderjumpimpedancelowpassfilterneedsixordertoreacheddesignparameterrequirements,whilethemethoddesignoffiltertransitionwiththanusedwizarddesignoftosteep;usedcutthansnowhusbanddesignoffilterbyneededsectionnumberjustfiveorder,whiletransitionwiththanformerarestee,Butitappearsinthepassbandripple.Thisdesignresultsandconclusionsforthedesignofmicrowavefiltersoffertheoryreference.Keyword:ADS,Butterworth,Chebyshev,Richards,Kurodaandlow-passfilters.目录TOC\o"1-3"\h\uHYPERLINK\l_Toc25677目录PAGEREF_Toc256771