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1、-------兰州交通大学硕士学位论文AbstractSincetheintroductionofthewaveguidesbyCohnin1947,theyhavereceivedconsiderableattention,andresearchonthemhascontinuedsteadily.Comparetothenormalrectangularwaveguide,ridgewaveguidehasthecharacterofbroaderbandwidth,smallerdimension,lowerequivalentcharacteristicim
2、pedance,etc.Becauseofthesemerits,itisusedmoreandmorewidelyinmicro-waveandmillimeter-wavedevices.Inearlyresearchofridgewaveguide,theymainlyresearchsingle-ridgewaveguideanddouble-ridgewaveguide,then,therecentresearchismorecomplicatedstructureofridgewaveguide,forexample,trapezoidal-ridgew
3、aveguide,antipodal-ridgewaveguide,etc..Inordertomeetsomerequirementsinmodernmicrowavetransmitsystems,itneedstoresearchsomenewwaveguideswithespecialsections.Theninproductionandpractice,owingtosomereasons,suchasproduction,assembly,use,andsoon,whichcanbringaboutdeformationsofridgewaveguid
4、e.Anditishelpfultoreinforcepracticeusetoanalyzedeformationsofridgewaveguidetoinfluenceoftransmissioncharacteristic.Therearefourchaptersinthispaper.Infirstchapter,developmentofridgewaveguide,andtheimportanceinpracticeofthispaperareintroduced;Insecondchapter,therearewaveguidetheory,thetr
5、ansmissioncharacteristicsofthenormalrectangularwaveguide;Inthirdchapter,thefiniteelementmethodemployedinthispaperisintroduced;Infourthchapter,thetransmissioncharacteristicsofmanykindsofridgewaveguideindifferentdeformationsisobtainedbyemployingthefiniteelementmethod.Onthebasisofexisting
6、data,choosinggeometrydimensionofridgewaveguideinthebettertransmissioncharacteristics,thecalculationresultsarecomparedwiththedatathatpublishedonforeign-----------andhomeauthoritativeissues,comparisonbetweentheliteraturedataandthecomputedresultsinthispapercanbefoundthattheresultsinthispa
7、peragreewellwiththeliteraturedata,whichprovethatthemethodandtheprogramareeffectiveandaccurateenough.ThepaperusesthefiniteelementPDEtoolboxintheMatlabenvironmenttoobtainthetransmissioncharacteristicsofthewaveguideindisplacementdeformationanddifferentdeformationunderstress,andworksoutt
