标签: antennas

MultifunctionalAntennas andArraysforWireless CommunicationSystems,IEEEPress

Theonlywaytodeterminethecharacteristicsofanantennaistomeasureitsperformancesincetheoryalonecannotpredicttheactualresults.Thefieldsgeneratedbyantennasareextremelycomplexbecausetheyinteractwitheverythingintheenvironment.Giventhiscomplexity,antennameasurementandanalysiswillbemoresuccessfulifyouuseanexperiencedandaccreditedantennalaboratoryequippedtohandlethetests,standards,andtheirnuances.……

DesigndualbandinternalantennasdesignfeatureByLeslieJReading,GaltronicsYOUCANFITMOSTCELLULARPHONESWITHANINTERNALANTENNAIFYOUGAINATHOROUGHUNDERSTANDINGOFTHEPHYSICSOFTHEPROBLEMANDIFYOURPERFORMANCEEXPECTATIONSREMAINCONSISTENTWITHINSOMEFUNDAMENTALLIMITS.Designingdual-bandinternalantennasAscellulartelephoneshaveevolvedovertheissuesconflictwitheachother(seesidebar“Factorsyears,sohavetheircomponents,particularlythetoconsiderininternal-antennadesign”).antennas.Thefirstcellulartelephoneswerebig,heavy,andclumsybutworkedwellusinglarge,coax-THEBASICMODELfed,half-wavelengthantennas.Ascellular-phoneFigure1illustratesadual-bandinternalantennahandsetsbecamesmaller,sodidtheantennas.Byus-initselementaryform.Thissimplemod……

DualPolarizedBaseStationAntennasForPolarizationDiversitysystemsDualPolarizedBaseStationAntennasForPolarizationDiversitySystemsItiswellknownthatinacellularnetwork,mobilephoneshaveconsiderablylowertransmittalpowerthanthetransmittersofthebasestations.Thismeansthatthetransmissionfromthemobilephonetothebasestation(uplink)ismuchmoreunfavorableinrelationtothetransmissionfromthebasestationtothemobilephone(downlink).Tocompensatethis,awayofimprovingthequalityofreceptionatbasestationshadtobefound.Duetothemulti-pathsignalpropagationofradiosignals,whichoccursinurbanareas,socalledSpaceDiversityReceptionhasbeenintroducedwhichprovidesthebestresultsinthefield.SpaceDiversityReceptionisbasedonthefollowingidea:Thesignaltransmittedbyamobilephonei……

DesignofCompactStacked-PatchAntennasonLTCCDesignofCompactStacked-PatchAntennasonLTCCTechnologyforWirelessCommunicationApplicationsE.Tentzeris,R.L.Li,K.Lim,M.Mseng,E.Tsai,G.DeJean,andJ.LaskarSchoolofElectricalandComputerEngineeringGeorgiaInstituteofTechnology,Atlanta,GA30332-0250,USAI.IntroductionTheexplodinggrowthofwirelesscommunicationssystemsleadstoanincreasingdemandfarintegratedcompactlow-costantennas,Asaresult,LTCC(LowTemperalureCo-firedCeramics)multilayertechnologyisbecomingmoreandmorepopularfortheproductionofhighlyintegrated,complexmultilayermodulesandantennas.Thistechnologyisappreciatedforitsflexibilityinrealizinganarbitrarynumberoflayers.However,LTCCmaterialstypicallypossessahighdielectricconstant,Ononehand,th……

ElectromagneticWaves&Antenn...,ElectromagneticWaves&Antennas……

射频天线麻省理工原版讲义David教授免费,receivers_antennas_signals……

ARC_Antennas2Antennas2.1IntroductionInelectricalengineering,informationtransfermeansenergytransfer.Thisisnormallyachievedbyguidingstructuressuchastwowiretransmissionlines,coaxialtransmissionlines,hollowordielectricwaveguides.Letusassumethataguidingstructure1E×Hconsistsofanideallyconductingmaterial.Inthiscase,thepowerdensityS=2(assumingejωtdependence)isdirectedalongtheguidingstructureandliescompletelyoutsidetheconductor.Ontheotherhand,e.g.aplanewavetravelingin+z-directionE=E0ejβzexE0jβzeeyH=Z0(2.1a)(2.1b)withZ0=0/ε0≈377asthefreespacewaveimpedancesatisesMaxwell’sEquationsanddoesn’tneedanyguidingstructures.Thetaskofanantennaistoallowenergytransferwithoutguidingstructuresa……

WLAN11a/b/g印刷天线原理及实物分析讲解,PrintedWLANAntennas……

对共形微带天线有兴趣的朋友请进,DesignofNonplanarMicrostripAntennasandTransmissionLines……

DielectricResonatorAntennas,Dielectric_Resonator_Antennas……

Antennas-Kraus,Kraus_antennas……

独家奉献《紧凑型宽带微带天线》范例手册，JohnWiley...,CompactandBroadbandMicrostripAntennas……