Design of Stepped-Impedance Combline Bandpass Filters With Symmetric Insertion-Loss.pdf

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1、IEEETRANSACTIONSONMICROWAVETHEORYANDTECHNIQUES,VOL.55,NO.10,OCTOBER20072191DesignofStepped-ImpedanceComblineBandpassFiltersWithSymmetricInsertion-LossResponseandWideStopbandRangeYi-MingChen,StudentMember,IEEE,Sheng-FuhChang,Member,IEEE,Chia-ChanChang,Member,IEEE,andTin-JaeHun

2、gAbstract—Anenhancedstepped-impedancecomblinebandpassisnecessitated.Itcanbedesignedbasedonthecombline,filteremploysanarrayofstepped-impedanceresonatorswithsteppeddigital,andcross-coupledfilterconfigurations[1]–[7].tapped-transformercouplingatinputandoutputispresentedThestripline

3、comblinefilter,introducedin[1],consistsofinthisstudy.Thisfilterhasenhancedperformance,includinganarrayofparallel-coupleduniform-impedanceresonatorssymmetricinsertion-lossresponsearoundthepassbandandwiderstopbandrange.Thestructureiscompactandsuitablefor(UIRs),whereallresonatorsa

4、reshortcircuitedtothegroundmultilayerrealizationbecauseitisfreeoflumpedcapacitorsandonthesamesideandcapacitivelyloadedontheotherside.hasfewervia-holegrounds.ThecircuitisinvestigatedwiththeThecapacitiveloadingreducestheresonatorlengthtolessthancharacteristicmodetheoryofcoupled

5、linestoprovetheexistenceone-quarterofawavelengthsuchthatthenearestspuriousbandofmultipletransmissionzerosaroundthepassband.Numerousishigherthanthreetimesthepassbandcenterfrequency.Todiagramsaregivenforcircuitdesignpurposes.Thesecond-andfourth-orderbandpassfiltersat2.45GHzwered

6、esigned,mea-befreeoflumpedcomponents,thecapacitivelyloadingcanbesured,andcomparedwiththeconventionalcomblinestructuretorealizedbythefringingcapacitoroftheresonatoropen-end,demonstratetheirperformanceenhancement.butthisfringingcapacitanceisusuallyinadequatetoobtainanIndexTerms

7、—Asymmetriccoupledline,comblinefilter,acceptablesizereduction.even–oddmode,stepped-impedanceresonator(SIR).Anothertypeofellipticbandpassfilter,termedasthesteppeddigitalellipticfilter,wasproposedin[2].Itwasdevelopedbasedonthebandpasstransformationfromanodd-orderellipticlow-I.INTR

8、ODUCTIONpassprototype.Thelumpedresonatorwasthenrealizedwithtwodiffer