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Chapter3BasicconceptsandtheoriesoffiltersMicrostripFiltersforRF/MicrowaveApplications.Jia-ShengHong,M.J.LancasterCopyright2001JohnWiley&Sons,Inc.ISBNs:0-471-38877-7(Hardback);0-471-22161-9(Electronic)CHAPTER3BasicConceptsandTheoriesofFiltersThischapterdescribesbasicconceptsandtheoriesthatformthefoundationfordesignofgeneralRF/microwavefilters,includingmicrostripfilters.Thetopicswillcoverfiltertransferfunctions,lowpassprototypefiltersandelements,frequencyandelementtransformations,immittanceinverters,Richards’transformation,andKurodaidentitiesfordistributedelements.Dissipationandunloadedqualityfactoroffilterelementswillalsobediscussed.3.1TRANSFERFUNCTIONS3.1.1GeneralDefinitionsThetransferfunctionofatwo-portfilternetworkisamat……