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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.Antennawhichissoimp
2、ortantformobiledevice,theperformanceandcharacteristicsofantennahaveanimportantroleonthequalityofwirelesscommunications.Thereforethereisagreatsignificancetodeviseminiaturizedandmulti-bandantennawhichcouldadapttomodernmobilecommunication.Inthiscontext,westarttoresearchonthe4G-LTEmobileantenna,which
3、issuitableformoderncommunication,especiallyitissuitablefor4G-LTEmobilecommunication.Designtwo4G-LTEantenna,weusetechnologyofmulti-branch,coupledfeedandcurvedpath.Antennacanbeusedontabletcomputer.Thefirstantennaunder-6dBreturnloss,low-frequencybandwidthoftheantennaisfrom700MHzto980MHz,high-frequen
4、cybandwidthisfrom1.71GHzto2.71GHz.ThebandofantennacoversfiveWWANband(GSM-850，GSM-900，DCS-1800，PCS-1900，UMTS)andtheentireLTEbeautifully.Thesecondantennaunder-6dBreturnloss,low-frequencybandwidthoftheantennaisfrom690MHzto885MHz,high-frequencybandwidthisfrom1705MHzto3.07GHz.Bandwidthofantennadoesnot
5、includetheGSM850andGSM900,thisisbecausethetabletcomputerdoesnotdependfor2Gcommunication.ThefirstantennaconsistsofamodifiedL-shapedantennaandtwoparasiticunits,theantennausesthecouplingfeedbetweentheL-shapedantennaandparasiticelements,atthesametimeinordertogetthebandwidthatlowfrequency,thegroundpla
6、nehaveaslottedL-shapedgap.ThesecondantennaconsistsofaT-shapeddrivingtheantenna,aparasiticcircuitstubandapatchasamatchingcircuitcomponents.Forthepurposeofachieveantennademandsofminiaturization,broadband,multi-frequency,usingsometechniquessuchascurvedstructureofantenna,coupledfeedanddual-modeofsing
7、lebranch,etc.Inthispaper,theantennadesignadoptsmethodwhichcombinessimulationanddesign.Firstofall,wesimulateantennausesoftwareHFSSofansoftcompany.Weproducedthefirstantennaandtestedreturnlossoftheantennaafterthesimulatio
