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《北斗與gps衛(wèi)星用戶(hù)天線(xiàn)和圓極化車(chē)載天線(xiàn)的研究》由會(huì)員上傳分享,免費(fèi)在線(xiàn)閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、AbstractⅢAbstractTheresearchworksarepresentedwithscientificprojects.Thethesisisdividedintotwoparts.Firstofall,adual-bandhighprecisionpositioningsatelliteuserantennaforBeidouNavigationSatelliteSystem(abbreviatedasBeidou)andGlobalPositioningSystem(abbreviatedasGPS)isdesignedandsimulated.Thedesi
2、ngedantennarealizeshighconsistencybetweenthephasecenterandthegeometriccenter.Secondly,accordingtothetechnicalrequirements,theengineeringsamplesofthewidebandcircularpolarizationantennaborneoncarwhichoperatesfromf0±50MHzisproposedandanalyzedindetail.Theproposedantennahas4%oftheopratingbandwidth
3、andrealizestheprojectrequirements.Theantennaprototypehasbeendeliveredtofirstpartytoused,andtheapplicationeffectisgood.Themaincontextscanbeillustratedasfollows:Firstly,inordertosatisfytheprojectrequirementsofthehighprecisionsatelliteuserantennaforBeidouandGPSsystems,adouble-layermicrostrippatc
4、hantennaisdesingedwhichemploysfoursymmetricalfeedingpoints,athickmediumsubstratewithlowdielectricconstantandtwofeedingnetworkshavingtwo-stagetwo-wayWilkinsonpowerdividerarepresentedbasedonthetheoryofdual-bandcircularlypolarizedmicrostripantenna.Thedesignedantennahastwofrequencybandswithitslow
5、frequencybandcovertheB3bandofBeidouandhighfrequencybandcovertheL1bandofGPSandB1bandofBeidou.Accordingtothesimulationoftheproposedantenna,fortherequiredfrequencyband,theVSWRislessthan1.4,thegainat90°inelevationisgreaterthan2.7dB.Intherangeof90°~24°inelevation,thegainisgreaterthan-5dB,andtheant
6、ennapatternroundnessislessthan1.5dB.TheARislessthan6dB,andconsistencyofthephasecenterandthegeometriccenterislessthan8mm.Thefront-to-rearisgreaterthan20dB.Thesimulatedresultsindicatethatthedesignedantennarealizeswidebeamcoverageonthehalf-spaceandrelativelyhighconsistencybetweenthephasecenteran
7、dthegeometriccenter.Secondly,theprojectrequirementsofthewidebandcircularpolarizationantennaborneoncarareillustrated.Inordertosatisfytheserequirements,amicrostrippatchantennaisproposedbasedontheoriesofwidebandcircularlypolarizedmicrostripanten