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1、2958IEEETRANSACTIONSONMICROWAVETHEORYANDTECHNIQUES,VOL.57,NO.12,DECEMBER2009TrueInlineCross-CoupledCoaxialCavityFiltersYingWang,Member,IEEE,andMingYu,Fellow,IEEEAbstract—Inthispaper,anoveltrueinlinecon?gurationforresonatingornonresonatingstructuresandma
2、yleadtospuriouscross-coupledcoaxialcavity?ltersispresented,whichischarac-peaksatout-of-bandfrequencies[9].Furthermore,foraninlineterizedbyasimpleandcompactstructure,improvedperformance,implementation,itisnecessarytocoupletheinputandoutputtoandgoodtunabi
3、lity.Insteadofusingfoldedstructures,dedicatedthesecondandthesecondtolastresonators.Additionalwiringscouplingprobes,orextracavities,asrequiredbyconventionaltechniques,crosscouplingisrealizedbychangingtheorientationareneededinordertomoveconnectorstothetwo
4、endsoftheofselectedresonators.Sequentialcouplingbetweenadjacent?lterhousing.resonatorsandcrosscouplingbetweennonadjacentresonatorsAnotherwell-knownsolutionforcombline?ltersistouseaareeffectivelycontrolledbyintroducingsmallmetalplatesatcouplingprobeembed
5、dedinthehousingofthe?lter.Fig.1(a)differentlocations.Asix-polebandpass?lterwithtwotransmis-demonstratesthecouplingandroutingschematicofanexamplesionzeroswasbuiltandtested.Themeasurementandsimulationresultsagreeverywell,demonstratingfeasibilityoftheinlin
6、e?ltersix-pole?lterwithonetransmissionzero.InFig.1(b),thecon?guration.Itenablescompactdesignwithimprovedresonatorcrosscouplingbetweenresonator1and3isrealizedbyaprobecomparedtoconventionalcombline?lters.Furthermore,crossacrossthreeresonators.However,such
7、alongprobegeneratescouplingcanbereadilyadjustedusingtuningelements.unwantedresonances.Fig.1(c)showsthefullelectromag-IndexTerms—Coaxialcavity?lters,combline?lters,crosscou-netic(EM)simulationresultsofthesix-pole?lterexamplepling,inline?lters,microwave?l
8、ters.centeredat1.54GHzusingHFSS[10].Besidesgeneratingatransmissionzeroabovethe?lterpassband,thecouplingproberesonatesandgeneratesaspikeinthelowerstopbandasshownI.INTRODUCTIONinFig.1(c).Anotherdisadvantageforsuchanimplementationis
