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摘要I摘要在2002年2月，美国联邦通信委员会（FederalCommunicationsCommittee,FCC）批准将3.1GHz-10.6GHz这一频带作为超宽带通信所用，这一举措对超宽带技术的发展起到了积极的推动作用，并在学术界和工业领域引起了广泛的研究兴趣。超宽带技术解决了困扰传统无线技术多年的有关传播方面的重大难题，它具有对信道衰落不敏感、发射信号功率谱密度低、低截获能力、系统复杂度低、能提供数厘米的定位精度等优点。超宽带滤波器是超宽带通信系统中非常重要的一个器件。根据FCC的技术规范来设计一个具有良好带内及带外特性的超宽带滤波器是一个很大的挑战。基于微带线的超宽带滤波器受到人们的广泛关注。在微波通信电路中，微带线是应用最为广泛传输线之一，因其具有易于加工、成本低、体积小、可大批量印刷生产等优点而被广泛应用于功分器、滤波器、天线等微波器件的设计加工中。目前人们针对基于微带线的超宽带滤波器开展了相关研究。提出了一些设计方法，例如，基于多模谐振器的设计方法及基于复合开裂环谐振器的方法等等。本文主要针对基于多模谐振器的超宽带滤波器开展研究。探索了一种多枝节加载的多模谐振器。仿真分析表明，该谐振器具有六个模式。在此基础之上，构造了一个超宽带滤波器。该滤波器能够覆盖3.1~11.0GHz频率范围；通带内的回波损耗为-12dB；带外在14GHz处的抑制可以达到-60dB。关键词语：滤波器、超宽带（UWB）技术、奇偶模分析法、多模谐振器ABSTRACTIIABSTRACTIn2002February,theUnitedStatesFederalCommunicationsCommission(FederalCommunicationsCommittee,FCC3.1GHz-10.6GHz)approvedthebandastheUWBcommunication,amovethatapositiveroletothedevelopmentofUWBtechnology,andhasattractedmuchinterestintheacademicandindustrialfields.Ultrawidebandtechnologytosolvetheproblemsoftraditionalwirelesstechnologyformanyyearsaboutthespreadoftheproblem,itisinsensitivitytochannelfading,lowpowerdensity,lowinterceptioncapacity,lowcomplexityofthesystem,providedafewcentimetersaccuracy.Ultra-widebandfilterisaveryimportantpartinUWBcommunicationsystem.AccordingtothetechnicalspecificationofFCCtodesignagoodin-bandandout-of-bandcharacteristicsofUWBfilterisabigchallenge.Ultra-widebandfiltermicrostriplineattentionbasedon.Inmicrowavecircuits,microstriptransmissionlineisoneofthemostwidelyused,becauseofitsdesignandprocessingofeasyprocessing,lowcost,smallsize,canbemassproduction,andiswidelyusedinpowersplitter,filtersandantennas,microwavedevices.AtpresentpeopleforUWBfilterbasedonmicrostriplinesofresearch.Putforwardsomedesignmethods,forexample,thedesignmethodbasedonmulti-moderesonatorbasedoncompositecrackingringresonatormethodetc..ThispapermainlyaimsattheresearchonUWBfilterbasedonmulti-moderesonator.Explorationofthemulti-moderesonatorastubloaded.Simulationresultsshowthat,theresonatorhassixmodes.Onthisbasis,constructaUWBfilter.Thefiltercancoverthe3.1~11.0GHzfrequencyrange;throughecholossbandfor-12dB;inhibitionwithexternal14GHzcanreach-60dB.KeyWords:Filter，ultrawideband(UWB)technology,even-oddmodeanalysis,Multimoderesonator目录III目录第1章引言.................................................................................................................11.1选题背景............................................................................................................11.2研究目标和意义................................................................................................11.3研究思路............................................................................................................1第2章微波滤波器网络基础理论.............................................................................22.1微波滤波器基本理论........................................................................................22.1.1微波滤波器参数指标..............................................................................22.1.2微波滤波器的分类..................................................................................42.2网络基本理论和微带耦合线节理论................................................................52.2.1微波滤波器网络散射矩阵......................................................................52.2.2网络的ABCD矩阵.................................................................................62.2.3微带平面结构..........................................................................................72.2.4微带耦合线节..........................................................................................82.3奇偶模分析方法................................................................................................92.3.1奇偶模原理..............................................................................................92.3.2奇偶模原理在多模滤波器分析的应用.................................................11第3章基于多模谐振器的超宽带滤波器的研究现状...........................................143.1多模谐振原理..................................................................................................143.1.1阶梯阻抗谐振器的基本特性................................................................143.1.2基于阶梯阻抗谐振器的多模谐振原理..............................................183.2基于多模谐振器的滤波器模型......................................................................233.3对滤波器进行对比分析..................................................................................263.3.1通过仿真来得到谐振频率....................................................................263.3.2用奇偶模分析法得出谐振频率............................................................263.4本章小结..........................................................................................................28第4章基于多模谐振器的超宽带滤波器的设计与仿真.......................................294.1概述..................................................................................................................294.2滤波器的初步设计仿真..................................................................................294.3滤波器各项尺寸的调试..................................................................................304.4超宽带滤波器的弱耦合及理论对比分析..............