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1、Thisarticlehasbeenacceptedforinclusioninafutureissueofthisjournal.Contentisfinalaspresented,withtheexceptionofpagination.IEEETRANSACTIONSONMICROWAVETHEORYANDTECHNIQUES1Model-BasedVector-FittingMethodforCircuitModelExtractionofCoupled-ResonatorDiplexersPingZ
2、hao,StudentMember,IEEE,andKe-LiWu,Fellow,IEEEAbstractInthispaper,anovelrationalfunctionapproxi-Inmassproductionofsuchmicrowavedevices,thephysicalmationmethod,namely,model-basedvectorfitting(MVF),isrealizationishighlysensitivetothedimensionaltoleranceofpropos
3、edforaccurateextractionofthecharacteristicfunctionstheresonatorsaswellasthecouplingelements.Therefore,ofacoupled-resonatordiplexerwitharesonanttypeofjunctionmanualtuningisnecessaryintheproductionprocesstomeetfromnoise-contaminatedmeasurementdata.MVFinherits
4、allthemeritsofthevector-fitting(VF)methodandcanalsostipulatethestringentsystemspecifications.Traditionally,thetuningtheorderofthenumeratorofthemodel.Thus,MVFissuitableisaccomplishedbyskilledtechnologiststhroughconsecutiveforthehigh-orderdiplexersystemidentific
5、ationproblemagainstmanualadjustmentsbasedontheiryearsofaccumulatedmeasurementnoise.Withtheextractedcharacteristicfunctions,experience.Tuningacoupled-resonatordevicewithacomplexathree-porttransversalcouplingmatrixofadiplexercanbecouplingtopologyisademanding,
6、time-consuming,andcostlysynthesized.Amatrixorthogonaltransformationstrategyisalsoproposedtotransformtheobtainedtransversalmatrixtoatargetprocess.Acomputer-aidedtuning(CAT)toolthatcanidentifycouplingmatrixconfiguration,whoseentrieshaveone-to-onethoseunsatisfy
7、ingcouplingvaluesanddeterministicallyguiderelationshipwiththephysicaltuningelements.Thewholemodelthetuningprocessishighlyappreciatedinthemicrowaveextractionprocedureisanalyticalandrobust,andcanbeusedinindustry.WithsuchaCATtool,thetuningprocesswilldependacom
8、puter-aidedtuning(CAT)programforcoupled-resonatormuchlessonhumanexperienceandthecostoftheproductiondiplexers.Apracticaltuningexampleofadiplexerwithacom-monresonatorisgivenindetailtodemonstratetheeffect
