現(xiàn)代通信系統(tǒng)中微波濾波器小型化的研究

1、上海大學(xué)博士學(xué)位論文現(xiàn)代通信系統(tǒng)中微波濾波器小型化的研究姓名：游彬申請(qǐng)學(xué)位級(jí)別：博士專業(yè)：無(wú)線電物理指導(dǎo)教師：李英20030501現(xiàn)代通信系統(tǒng)中微波濾波器的小型化的研究ABSTRACTInrecentlyyearswiththefastdevelopmentofmobilecormnunicationsandpersonalcommunicationsandwiththehighintegrationofintegratedcircui

2、ts，microwavefilterasoneoftheabsolutelynecessarilyequipmentsinwirelesscommunicationssystems，arebecomingsmallerandsmallerAtthesametime，withthefastdevelopmentofcomputers，finitedifferencetimedomain(FDTD)methodisbecomingapowe

3、rfultoolofanalyzingtheseelectromagneticproblemsInthisdissertation，severalnovelminiaturizedmicrowavefiltersarepresentedandFDTDanalysisofthesefiltersisstudiedThedissertationisclassifiedintofivepartsstatedaSfollowsFirstlyth

4、eresonatorstructureisanalyzedbythefinite—differencetimedomainmethod，andthefinite—differencetimedomainmethodanalysisonplanarmicrostripstructures，multilayermicrostripstructuresanddefectedgroundstructureusingtheperfectlymat

5、chedlayer(PML)absorbingboundarycondition(ABC)isfullystudiedComparingwiththeconventionalMur’sabsorbingboundarycondition，applyingPMLsabsorbingboundaryconditioncannotonlypredigestthefeedingmodel，decreasethetotalmeshdimensio

6、ns，butalsoquickentheconvergence，improvethecalculatingspeedSecondly’thedualmodedielectricresonatorandinfluenceofdisturbanceareanalyzedfinitedifferencetimedomainWedesignadualmodedielectricresonatorfilterwitllplanarcoaxialp

7、ortonthebasisofanalysisresultsThisfilterfilledwithhJ∞dielectricconstantmaterial，andthevolumeisreducedandacquiredbeRercharacteristicThirdlyasynthesismethoddesignedChebyshevfilterisintroducedWecombinedthismethodwithFDTDusi

8、ngdesignedsomekindsofcouplingresonatorfilterThismethodcanstartedwiththedesigningspecification，combinedwithanalysismethod，andacquiredthedimensionoffilterThismethodhasimportantmeaninginactualapplicationFourthlyanoveldefect

9、edgroundstructureisdiscussedAtransmissionpolarwillbeacquiredifweplacethisdefectedgroundstructureingroundplaneofimcrnstripline，soweadoptthisdefectedgroundstructureinrestrainingparasiticalffequencyThisstructurecanrestrainp

10、arasiticalpassbandavailablywithoutincreasingvolumeandinsertedlossesoffilterLastlywedesignedanovelmultilayerslow—waveaperturecouplingresonatorfilterthroughcombinedtheslowwavestructurewithmultilayertechniqueThisfilterhasno

11、tonlysmallervolumebutalsowidersk’pbandThevolumeofthisfilterishalfofthatofsingleplanarfilterbecauseofmultilayertechniqueWecandesignChebyshevandquasielliptic—functionfilterswiththismethodandacquiredbettereffectKeywords：mic