寬帶和共形印刷天線的研究.pdf

1、上海大學(xué)博士學(xué)位論文寬帶和共形印刷天線的研究姓名：?？ド暾?qǐng)學(xué)位級(jí)別：博士專業(yè)：電磁場(chǎng)與微波技術(shù)指導(dǎo)教師：鐘順時(shí)20040201ABSTRACTRapiddevelopmentincommunicationsystemshasledtotheprosperityofantennas，amongwhichtwoimportanttypesofantennasatepromisingandvaluableforapplicationsand

2、havebeentheinternationalresearchfrontiersOneisbroadbandprintedantennas，whichcarlcovermulticommunicationbands，thusthenumberofantennasusedinthecommunicationsystemsCanbereducedgreatlyAsaresult，thecosts，weight，andproblemswit

3、helectromagneticcompatibilityandsafetyaspectsinthesystemswillbedecreasedTheotherisconformalprintedantennas，whichcansatisfyaerodynamicconstraintsofhighspeedaircmflsandvehiclesandarereliable，durableandaestheticalInthisdiss

4、ertation，severalnoveldesignsofbroadbandprintedantennasarepresented，inaddition，thecharacteristicsofconformalprintedantennasarcstudiedandtheexperimentalverificationsaregivenThedissertationwillincludethefollowingcontentsFir

5、stly，asurveyonthebroadbandprintedantennaandconformalmicrostripantennaispresentedThenthenumericalmethodssuchasFiniteDifferenceTime—DomainMethod(FDTD)，MethodofMoments(MoM)andFiniteElementMethod(FEM)areintroducedindetails，w

6、hichageusedtoanalysisthenovelantennasFuahermore，theabovethreemethodsRrecompared，Secondly，basedonthestudyofcoplanarwaveguide(cpw)，bylinearlytaperingtheconnectiona／eabetweentheCPWfeedlineandtheradiationslob，wegettwonewdesi

7、gnsofbroadbandprintedslotantennasTheimpedancecharacteristicsandradiationpaaemsoftheslotantennaswithdifferentsizeoftapersarepresentedanddiscussedFortheirtestantennas，simulatedresultsagreewellwiththemeasuredones，andtheimpe

8、dancebandwidthof一10dBretumlossreaches37％and40％respectivelyThirdlyaCPWCPWtransitionispresented，whichchangesthesizeofCPWwhilekeepingthecharacteristicsimpedanceofCPWunchangedandcanbeusedtoconnecttheprintedantennaaboveorothe

9、rCPWfeedlinetoagivensizecoaxThen，theinfluenceofdifferenttaperedanglesonthepropagationcharacteristicsofthetransitionisanalyzed，andthereasonablerangeofthetaperedangleforapplicationisgivenMoreovertheperformancesofbroadbandp