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1、杭州电子科技大学硕士学位论文ABSTRACTIndustryofmobilecommunicationhavearapiddevelopment.Mobiledevices–phones,tabletcomputeraremoreandmoreintelligent,ultra-thinandrapidcomputingspeed.Asahubofmobiledevicetosendandreceivesignal-antenna,thefuturetrendofantennaisboundtobeminiaturizedandmulti-band.A
2、ntennawhichissoimportantformobiledevice,theperformanceandcharacteristicsofantennahaveanimportantroleonthequalityofwirelesscommunications.Thereforethereisagreatsignificancetodeviseminiaturizedandmulti-bandantennawhichcouldadapttomodernmobilecommunication.Inthiscontext,westarttore
3、searchonthe4G-LTEmobileantenna,whichissuitableformoderncommunication,especiallyitissuitablefor4G-LTEmobilecommunication.Designtwo4G-LTEantenna,weusetechnologyofmulti-branch,coupledfeedandcurvedpath.Antennacanbeusedontabletcomputer.Thefirstantennaunder-6dBreturnloss,low-frequency
4、bandwidthoftheantennaisfrom700MHzto980MHz,high-frequencybandwidthisfrom1.71GHzto2.71GHz.ThebandofantennacoversfiveWWANband(GSM-850，GSM-900，DCS-1800，PCS-1900，UMTS)andtheentireLTEbeautifully.Thesecondantennaunder-6dBreturnloss,low-frequencybandwidthoftheantennaisfrom690MHzto885MHz
5、,high-frequencybandwidthisfrom1705MHzto3.07GHz.BandwidthofantennadoesnotincludetheGSM850andGSM900,thisisbecausethetabletcomputerdoesnotdependfor2Gcommunication.ThefirstantennaconsistsofamodifiedL-shapedantennaandtwoparasiticunits,theantennausesthecouplingfeedbetweentheL-shapedan
6、tennaandparasiticelements,atthesametimeinordertogetthebandwidthatlowfrequency,thegroundplanehaveaslottedL-shapedgap.ThesecondantennaconsistsofaT-shapeddrivingtheantenna,aparasiticcircuitstubandapatchasamatchingcircuitcomponents.Forthepurposeofachieveantennademandsofminiaturizati
7、on,broadband,multi-frequency,usingsometechniquessuchascurvedstructureofantenna,coupledfeedanddual-modeofsinglebranch,etc.Inthispaper,theantennadesignadoptsmethodwhichcombinessimulationanddesign.Firstofall,wesimulateantennausesoftwareHFSSofansoftcompany.Weproducedthefirstantennaa
8、ndtestedreturnlossoftheantennaafterthesimulatio
