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AUnifiedApproachtotheDesignMeasurementandTuningofCoupled-ResonatorFiltersIEEETRANSACTIONSONMICROWAVETHEORYANDTECHNIQUES,VOL.46,NO.4,APRIL1998343AUniedApproachtotheDesign,Measurement,andTuningofCoupled-ResonatorFiltersJohnB.NessAbstract―Theconceptofcouplingcoefcientshasbeenaveryusefuloneinthedesignofsmall-to-moderatebandwidthmicrowavelters.Itisshowninthispaperthatthegroupdelayoftheinputreectioncoefcientsofsequentiallytunedresonatorscontainsalltheinformationnecessarytodesignandtunelters,andthatthegroup-delayvalueatthecenterfrequencyoftheltercanbewrittenquitesimplyintermsofthelow-passprototypevalues,theLCelementsofabandpassstructure,andthecouplingcoefcientsoftheinvertercoupledlter.Thisprovidesaneasymethodtomeasurethekeyelementsofalter……