高低通级联超宽带带通滤波器--论文

高低通级联超宽带带通滤波器的设计摘要随着移动智能终端的快速发展，用户对无线通信带宽的要求越来越高，超宽带(UWB)技术成为解决此矛盾的主要技术之一。超宽带滤波器在此背景下应运而生，微波滤波器性能的好坏往往直接影响到整个无线通信系统的质量。本文针对超宽带滤波器的设计而展开，设计了两款高低通级联超宽带滤波器。本文首先对微波滤波器设计的基本理论进行分析，以及滤波器的技术指标。本文依据高低通级联超宽带带通滤波器的特性，采用微带多谐振荡器设计了两种多谐振荡器实现微波高低通级联的超宽带滤波器，并给出了滤波器设计的结构参数和材料属性。借助仿真软件HFSS对两种高低通级联超宽带滤波器进行仿真，通过对仿真结果中正向传输系数S21和回波损耗S11进行了分析，结果表明由开槽谐振子组成的滤波器和由一对谐振子组成滤波器可使高频段或低频段的微波信号通过滤波器，且通带频段较宽实现高低通级联超宽带滤波。关键字：超宽带(UWB)技术；微波滤波器；超宽带滤波器AbstractWiththerapiddevelopmentofmobileintelligentterminal,thedemandofwirelesscommunicationbandwidthdemandhasbeenincreasing,Ultra-wideband(UWB)technologytobecomeoneofthekeytechnologiestoresolvethiscontradiction.Ultra-widebandfilterinthiscontextcameintobeing,theperformanceofmicrowavefilterwilloftendirectlyaffectthequalityofthewirelesscommunicationsystem.Thisthesisdesignedfortwohigh-lowpasscascadeultra-widebandfilter.Thethesisfirstlyanalyzedthebasictheoryofmicrowavefilter,andtechnicalspecificationsofthefilter.Basedonthecharacteristicsofhighandlowpasscascadedultra-widebandbandpassfilter,microstripmultivibratordesignedtwomultivibratorrealizemicrowavehighandlowpassfiltercascadeofultra-wideband,andgivesstructuralparametersandmaterialpropertiesofthefilters.WithsimulationsoftwareHFSSforbothhighandlowpassfiltercascadeultra-widebandsimulation,thesimulationresultsoftheforwardtransmissioncoefficientS21andreturnLossS11wereanalyzed,theresultsshowthatthefilterconsistsofslottedresonatorandcomposedbyacompositionoftheresonatorfilterallowshighfrequencyorlowfrequencymicrowavesignalthroughthefilter,andAchieveawiderpassbandbandcascadeultra-widebandfilter.Keywords：Ultra-widebandtechnology,microwavefilter,ultra-widebandfilter目录第一章绪论................................................................................................................................1第一节研究背景及意义................................................................................................................1第二节研究现状............................................................................................................................2第三节论文的主要工作及结构安排............................................................................................6第二章滤波器设计的基本原理...................................................................................................8第一节微波滤波器基本理论........................................................................................................8第二节滤波器的技术指标............................................................................................................92.2.1通带频段.................................................................................................................92.2.2插入损耗.................................................................................................................92.2.3带外抑制...............................................................................................................102.2.4端口驻波比...........................................................................................................102.2.5其他指标...............................................................................................................10第三节本章小结..........................................................................................................................11第三章高低通级联超宽带滤波器的设计..................................................................................12第一节超宽带滤波器的设计方法..............................................................................................12第二节基于开槽多模谐振器设计的超宽带滤波器..................................................................13第三节基于一对多模谐振器设计的超宽带滤波器..................................................................15第四节本章小结..........................................................................................................................16第四章超宽带滤波器的仿真与分析.........................................................................................17第一节HFSS简介.......................................................................................................................17第二节基于开槽多模谐振器的滤波器仿真与分析..................................................................17第三节基于一对多模谐振器的滤波器仿真与分析..................................................................19第四节本章小结..........................................................................................................................21结论...........................................................................................................................................22致谢...........................................................................................................................................23参考文献.....................................................................................................................................241第一章绪论第一节研究背景及意义随着移动智能终端的快速发展，用户对无线通信带宽的要求越来越高，超宽带(UWB)技术成为解决此矛盾的主要技术之一，因此越来越多研究学者对其进行研究。超宽带以其高速率、低功耗、高保密性以及抗干扰能力强等优点，具有非常广泛的应用前景和相当巨大的市场价值。虽然美国军方以及航空界对于开放超宽带频段民用仍然存在着意见分歧，但是由于超宽带技术潜在的诱人的应用前景，美国联邦通讯委员会(FCC)于2002年2月批准了超宽带技术在短距离无线通信领域的应用[1]。这为超宽带技术产品的商业化应用打开了大门，促进了超宽带系统及其器件研究的进展。由于超宽