毫米波悬置微带线双工器的设计

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1、摘要双工器在数字微波通信系统中有着广泛的应用。由于悬置微带线结构很好的综合了微带线平面化及波导高Q值的优点，因而研究悬置微带线双工器具有重要意义。本文重点研究了悬置微带线

2、’flJ隙耦合滤波器，利用全波仿真软件获得耦合系数和外部品质因数与滤波器结构参数的对应关系并进行曲线拟合，再结合低通滤波器原型综合出滤波器初始结构参数。在此基础上，综合并精确仿真设计了两款悬置微带线I’日J隙耦合带通滤波器。仿真结果表明两款滤波器的中心频率分别位于23．97GHz和24．97GHz；带宽分别为4571dHz和518MHz，插入损耗小于ldB，回波损耗大于19dB，基本满足设计要求。将

3、两款滤波器通过T型接头连接得到毫米波悬置微带线双工器的初始模型，在此基础上进行精确的全波电磁场仿真优化。仿真结果表明，双工器通带中心频率分别位于23．97GHz平124．97GHz。通带带宽分别为418MHz和510Mttz，插入损耗小于ldB，回波损耗大于19dB；带外抑制良好，在距离中心频率1GHz处衰减大于70dB，基本满足设计要求。因数关键词：双工器悬置微带线间隙耦合结构滤波器耦合系数外部品质AbstractAsweknow，diplexerplaysanimportantroleinthedesignofdigitalmicrowavecommunicati

4、onsystems．Duetoitscombinationofcomplanationandwaveguidehigh—Qvalue，theresearchofSuspendedmicrostrip1ineend—coup]eddiplexeriSofgreatsignificance．ThiSthesiSfocusesontheresearchofSuspendedmicrostriP1ineend—coupledfilters．Duringthedesign，ful卜wavesimulationwasapplledtogettherelationshipbetwe

5、entheparametersofthefilterstructuresandthecouplingcoefficientsasweliastheexternalqualityfactorsvalues．Hence．theoriginalparametersofthefi1terstructureswerecalculatedincorporatingthefull一waveSimulationwiththelowpassprototype．Twodifferentdesignswerecarriedoutaftertheunityoftheaccuratesynth

6、esiSandsimulationbasedonthetheoreticalparameters．Afterexperiments，theoptimizationresultsshowedthatthecenterfrequenciesoftwofi1terswerelocatedat23．97GHzand24．97GHzwiththebandwidth457MHzand518MHz．Bothofthereturnlossesweremorethan19dBwhichsatisfiedourdemands．Basedonthedesignofband—passfilt

7、ers，aK-banddiplexerwasproposedandSimulatedafterconnectingtwodifferentfilterswiththeT—junction．Theoptimizationresultsshowedthatthecenterfrequenciesofthetwopass—bandswerelocatedat23．97GHzand24．97GHzwiththebandwidth418MHzand510MHz．Besides．wefoundthattheinsertionlosswaslessthanidBandtheretu

8、rnlosswasmorethan190B，theinhibitiondegreeiSgood，theattenuationiSbetterthan70dB1GHzawayfromcenterfrequencywhichrealizedourdesigngoals．KeyWords：Suspendedsubstratestripline，End—Coupled，Duplexer，couplingcoefficient，Externalqualityfactor日录目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯IAbstract．．．．．．．．．．