資源描述：
《寬帶圓極化與超寬帶印刷天線設(shè)計》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、II寬帶圓極化及超寬帶印刷天線設(shè)計AbstractIIIAbstractAsthedevelopmentofmodernradars,electronicwarfareandwirelesscommunicationsandtheupgradingofelectronicequipments,modernantennasarefacingmorechallenges,whichrequireantennasnotonlywithwide-bandandcircularlypolarizedcharacteristics,butalsowithsm
2、allvolumeandlightweight.Printedantennasarewidelyusedinwirelessequipmentsfortheiradvantages,likelowprofile,lightweight,lowcost,andeasyfabrication.Inthisthesis,thedesignofbroadbandcircularlypolarizedandultra-widebandprintedantennasforwirelesscommunicationsystemsareaddressed.Two
3、printedantennaswithultra-widebandlinearlypolarizedandbroadbandcircularlypolarizedcharacteristicsrespectivelyarestudiedbyAnsoftHighFrequencyStructureSimulator(HFSS)softwarebasedonfinite-elementmethod.Theprototypesofthesetwoantennasarealsofabricated.Themajorcontributionsofthist
4、hesisareoutlinedasfollows:1.Onetypeofultra-widebandprintedantennasisdesigned.Byattachingarectangularstubtothecircularradiatingpatch,additionaltworesonantpointsforthedesiredbandcanbeexcited.Sothebandwidthoftheproposedopenslotantennaisgreatlyenhanced.Themeasuredimpedance-bandwi
5、dthisabout11.66GHz(139%)from2.57to14.23GHz.Theexperimentalresultsindicatethattheproposedantennahasgoodradiationcharacteristicsintheoperatingfrequencyband.2.Akindofbroadbandcircularlypolarizedprintedantennasisproposed.Thisantennaobtainstwoorthogonalelectricfieldvectorswithequa
6、lamplitudeand90°phasedifference(PD)byusinganasymmetricgroundplane.Alargeaxialradio(AR)bandwidthcanbereachedbyadjustingthedegreeofasymmetryofthegroundplane.Then,bycuttingasmallrectangularslotfromtheasymmetricgroundplane,thewideimpedance-bandwidthandbroadAR-bandwidthcanbeobtain
7、edsimultaneously.Themeasuredimpedance-bandwidthandAR-bandwidthare5.96GHzfrom4.06to10.02GHzand2.64GHzfrom5.91to8.55GHz,respectively.Theexperimentalresultsindicatethattheantennahasgoodcircularlypolarizedradiationcharacteristics.Keywords:Ultra-wideband(UWB)CircularlyPolarizedPri
8、ntedAntennasWirelessCommunicationsIV寬帶圓極化及超寬帶印刷天線設(shè)計目錄V目錄摘要..........
