uhf波段带通滤波器小型化分析-(5361)

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1、杭州电子科技大学硕士学位论文ABSTRACTWithahighspeeddevelopment,China’wirelesscommunicationindustryhasenjoyedagreatpopularityinthiscentury.AndasoneofthemostusefulsignalcarrierbandsforRadioandTelevisionorRadioCommunication,UHFbandhasbeengainingsignificancebyday.Duetotheinc

2、entivesundertheMarketeconomy,electronicequipmentshavebeenspreadextensivelytotheconsumers,whichmaycausesatendencyofcompact,integrate,low-costandhigh-efficiencyelectronicdevicesdesigning.Hence,microwavefilterdesigninghasbeenfightingforacompromisebetweencosta

3、ndperformanceforalongtime.YetstudiesonUHFbandpassfiltersarebecoming―hotspot‖ofthelateyearsinthemeritofimprovingtheUHFdevicesperformances,suchasenhancingelectroniccomponentcharacteristics,reducingproductioncostandraisingtheutilizationrateofbands.Thispaperfi

4、rststartswithsomeclassicmethodology,suchasfiltersynthesizeorimageparametermethod.Bythecomparisonsamongparallelcoupled,hairpintype,combtypeorotherstructuresoffilter,howtominiaturizeaUHFfilterisgiven.ThefurtherconcentratesonUHFband-passfilterormulti-bandsfil

5、terdesign.Bytheuseofcapacitorloaded,open-loopresonators,whichresultsinadual-bandperformance,g/4slotsstructure,sideloadedresonatorandotherfilterstructures,severalfilterswerecarriedoutandmeasuredinthetypesofminiaturizedlumpedfilterandmicrostripfilters.Theau

6、thor’sworksaremainlyconsistsof:(1).SummarizesadvantagesanddisadvantagesbycontrastingtheSparametersbetweenlumpedorquasi-lumpedandmicrostripfilter,anditsapplicablescope.Ontheonehand,Atypeofminiaturizedlumpedfilterwhichisimprovedafterbyquasi-lumpedcomponents,

7、iscarriedout,andalsomeasuredbytheaidofaAgilentVectornetworkanalyzer,whichisverysuitableforLTEsystem.Ontheotherhand,high-lowimpedancefilter,parallelcoupledfilter,hairpinfilter,combfilteraredesignedandsimulatedthatinfersmultiplecharacteristicsbasedondifferen

8、tfilterstructures.(2).Ag/2openstubwasfoldedintoopen-loopresonatorinordertominiaturizefiltersize.Thenacapacitorcomponentisloadedinthecenteroffoldedstrip,whichwouldsubsequentlychangethecenterfrequencyofsecondh