a unified approach tuning of coupled-resonator filters

a unified approach tuning of coupled-resonator filters

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时间:2019-08-09

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1、IEEETRANSACTIONSONMICROWAVETHEORYANDTECHNIQUES,VOL.46,NO.4,APRIL1998343AUnifiedApproachtotheDesign,Measurement,andTuningofCoupled-ResonatorFiltersJohnB.NessAbstractÐTheconceptofcouplingcoefficientshasbeenaheretoincludedirectlysettingthecouplingvaluesaswellveryusefuloneinthedesigno

2、fsmall-to-moderatebandwidthastheresonantfrequencyandªrealtimeºadjustmentformicrowavefilters.Itisshowninthispaperthatthegroupdelaytheeffectsoffrequencypullingoftheresonantfrequency.oftheinputreflectioncoefficientsofsequentiallytunedresonatorsSettingthecouplingvaluesarisesfromthesimp

3、lerelationshipcontainsalltheinformationnecessarytodesignandtunefilters,andthatthegroup-delayvalueatthecenterfrequencyofthefilterbetweenthecouplingandgroupdelayofthereflectedsignal.canbewrittenquitesimplyintermsofthelow-passprototypeTherelevantequationsarederivedinthispaperandconfirm

4、edvalues,theLCelementsofabandpassstructure,andthecouplingbymeasuredresultsonfiltersandbycomparisonwithothercoefficientsoftheinvertercoupledfilter.Thisprovidesaneasytechniques.methodtomeasurethekeyelementsofafilter,whichisconfirmedbyresultspresentedinthispaper.Itisalsosuggestedthatsin

5、cethegroupdelayofthereflectioncoefficient(i.e.,thetimeII.THEORYtakenforenergytogetinandoutofthecoupledresonators)isThestandardapproachtofilterdesignusinglow-passeasilymeasured,itisausefulconceptualalternativetocouplingbandpassinvertercoupledresonatorsisshowninFig.1.concepts.Thenome

6、nclatureusedfollowsconvention.Thecouplingbe-IndexTermsÐCoupling,filters,groupdelay,resonators.tweentheconnectinglinesandtheinputandoutputresonators,referredtoastheexternalor,andthecouplingbetweenI.INTRODUCTIONresonatorsarereadilyspecifiedintermsoftheprototypevaluesandtherelativeba

7、ndwidth.OncethesecouplingHEDESIGNofmicrowavefiltersisbasedonvaluesaresetandtheresonatorsalltunedtothecenterTwell-establishedtechniqueswithperhapsthefrequency,theinvertercoupledfilterwillhavethefrequencylowpass±bandpass±invertercoupled-resonatorprocessbeingresponsepredictedbythetra

8、nsformedlow-passprototypethemostcommondesignmet

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