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1、兰州交通大学硕士学位论文AbstractSincetheintroductionofthewaveguidesbyCohnin1947,theyhavereceivedconsiderableattention,andresearchonthemhascontinuedsteadily.Comparetothenormalrectangularwaveguide,ridgewaveguidehasthecharacterofbroaderbandwidth,smallerdimension,lowerequivalentcharacterist
2、icimpedance,etc.Becauseofthesemerits,itisusedmoreandmorewidelyinmicro-waveandmillimeter-wavedevices.Inearlyresearchofridgewaveguide,theymainlyresearchsingle-ridgewaveguideanddouble-ridgewaveguide,then,therecentresearchismorecomplicatedstructureofridgewaveguide,forexample,tra
3、pezoidal-ridgewaveguide,antipodal-ridgewaveguide,etc..Inordertomeetsomerequirementsinmodernmicrowavetransmitsystems,itneedstoresearchsomenewwaveguideswithespecialsections.Theninproductionandpractice,owingtosomereasons,suchasproduction,assembly,use,andsoon,whichcanbringaboutd
4、eformationsofridgewaveguide.Anditishelpfultoreinforcepracticeusetoanalyzedeformationsofridgewaveguidetoinfluenceoftransmissioncharacteristic.Therearefourchaptersinthispaper.Infirstchapter,developmentofridgewaveguide,andtheimportanceinpracticeofthispaperareintroduced;Insecond
5、chapter,therearewaveguidetheory,thetransmissioncharacteristicsofthenormalrectangularwaveguide;Inthirdchapter,thefiniteelementmethodemployedinthispaperisintroduced;Infourthchapter,thetransmissioncharacteristicsofmanykindsofridgewaveguideindifferentdeformationsisobtainedbyempl
6、oyingthefiniteelementmethod.Onthebasisofexistingdata,choosinggeometrydimensionofridgewaveguideinthebettertransmissioncharacteristics,thecalculationresultsarecomparedwiththedatathatpublishedonforeignandhomeauthoritativeissues,comparisonbetweentheliteraturedataandthecomputedre
7、sultsinthispapercanbefoundthattheresultsinthispaperagreewellwiththeliteraturedata,whichprovethatthemethodandtheprogramareeffectiveandaccurateenough.ThepaperusesthefiniteelementPDEtoolboxintheMatlabenvironmenttoobtainthetransmissioncharacteristicsofthewaveguideindisplacementd
8、eformationanddifferentdeformationunderstress,andworksoutthenormalizedcutoff
