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1、2958IEEETRANSACTIONSONMICROWAVETHEORYANDTECHNIQUES,VOL.57,NO.12,DECEMBER2009TrueInlineCross-CoupledCoaxialCavityFiltersYingWang,Member,IEEE,andMingYu,Fellow,IEEEAbstract—Inthispaper,anoveltrueinlineconfigurationforresonatingornonresonatingstructuresandma
2、yleadtospuriouscross-coupledcoaxialcavityfiltersispresented,whichischarac-peaksatout-of-bandfrequencies[9].Furthermore,foraninlineterizedbyasimpleandcompactstructure,improvedperformance,implementation,itisnecessarytocoupletheinputandoutputtoandgoodtunabi
3、lity.Insteadofusingfoldedstructures,dedicatedthesecondandthesecondtolastresonators.Additionalwiringscouplingprobes,orextracavities,asrequiredbyconventionaltechniques,crosscouplingisrealizedbychangingtheorientationareneededinordertomoveconnectorstothetwo
4、endsoftheofselectedresonators.Sequentialcouplingbetweenadjacentfilterhousing.resonatorsandcrosscouplingbetweennonadjacentresonatorsAnotherwell-knownsolutionforcomblinefiltersistouseaareeffectivelycontrolledbyintroducingsmallmetalplatesatcouplingprobeembed
5、dedinthehousingofthefilter.Fig.1(a)differentlocations.Asix-polebandpassfilterwithtwotransmis-demonstratesthecouplingandroutingschematicofanexamplesionzeroswasbuiltandtested.Themeasurementandsimulationresultsagreeverywell,demonstratingfeasibilityoftheinlin
6、efiltersix-polefilterwithonetransmissionzero.InFig.1(b),theconfiguration.Itenablescompactdesignwithimprovedresonatorcrosscouplingbetweenresonator1and3isrealizedbyaprobecomparedtoconventionalcomblinefilters.Furthermore,crossacrossthreeresonators.However,such
7、alongprobegeneratescouplingcanbereadilyadjustedusingtuningelements.unwantedresonances.Fig.1(c)showsthefullelectromag-IndexTerms—Coaxialcavityfilters,comblinefilters,crosscou-netic(EM)simulationresultsofthesix-polefilterexamplepling,inlinefilters,microwavefil
8、ters.centeredat1.54GHzusingHFSS[10].Besidesgeneratingatransmissionzeroabovethefilterpassband,thecouplingproberesonatesandgeneratesaspikeinthelowerstopbandasshownI.INTRODUCTIONinFig.1(c).Anotherdisadvantageforsuchanimplementationis
