简介：Theeffectofthespatialcharacteristicsofantennaarrayonsmartantennasystemscannotbeneglected.Inthepaper,therelationbetweenspatialcorrelationandinter-antennadistance,impingingangle,anglespreadisfirstinvestigated.Withthesamebeamformingalgorithm,wesimulatetheperformanceofsmartantennasystemwithdifferentAngleSpread(AS)valuesontheconditionsofidealandrealAngleofArrival(AOA)estimation.TheresultsshowthatwiththeidealAOAestimation,theAOAisenoughaccuratetoguaranteethatthesystemonlyhaslittleperformancedegradationeveninthecaseof20degreeeASvaluewhiletherealAOAestimationinfluencedbychannelenvironmentdegradestheperformanceveryobviously,uptoabout7dB.

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简介：一个表面波浪激动的血浆列能充当一条血浆天线。实验被执行学习电流和传导性如此的一条血浆天线的分布，领域，功率模式，择向性和效率。另外，一条相等的金属性的铜天线被建立，它的天线参数与血浆天线的相比。我们的调查结果显示在血浆天线的泛音的力量内容是与铜天线相比同样突出的更多(它仅仅产生基本频率)。然而，为两条天线的力量模式是相当类似的。在血浆天线的领域里关于泛音的产生提供更质的理解，双性人光谱的分析被执行在当前的变化学习非线性的相互作用。血浆天线的一些特定的特征在我们的学习被调查，它可以关于常规金属性的天线提高血浆天线的申请前景。

简介：Anovelellipsoidalhelicalantennaisproposedandstudiedinthisletter.Asaspecialin-stance,thehemisphericalhelicalantennasareanalyzedfirstly,whichindicatesthatthecharacteristicsofatwo-armunitarebetterthanthatofasingle-armunit.Basedonthis,theellipsoidalhelicalantenna,formedbychangingtheaxialdirection’sdimensionofthetwo-armhemisphericalhelicalantenna,isanalyzedbythemomentmethodwithcurvedbasicandtestingfunction.TheeffectstoVSWR(VoltageStandingWaveRatio),gain,polarizationandpatternsbytheaxialdirection’sdimensionsareinves-tigated.Thestudyresultsprovidedependablegisttothechoiceofantennaformataccordingtothepracticalrequirements.

简介：

简介：

简介：Averticalantennaembeddedinearthwithconductivecoatinghasbeeninvesti-gatedbyemployingthemethodofintegralequation.ThistopicisavailabletoEM-MWD(Elec-tromagneticMeasurement-While-Drilling)system,whichisanewrealtimesystemfordrillingmeasurement.Undertheconditionthatthewavenumberoftheearthismuchlargerthanthatoftheair,acurrentintegralequationhasbeenderived.Afterthecurrentdistributionhavingbeendetermined,theelectricfieldstrengthontheearthsurfacehasbeenpredictedanditsdependencesontheoperatingfrequencyandthedepthofthewellhavebeendiscussedaswell.

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简介：AnoveloffsetFresnelZonePlatereflectorAntenna(FZPA)isproposed,thephasecorrectingzoneofthisFZPAiselliptic.BasedonPhysicalOpticsMethod,thefocusingcharacteristicsofthereflectorareanalyzed.ThecomparisonofthisnewFZPAwiththecircularFZPAandMawzonesFZPAismade.

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简介：

简介：Amethodhasbeendevisedtoanalyzemultilayerelectricallythickcircularmi-crostripantennaexcitedbyaprobe.Thecurrentontheprobeistakentobeuniform.Thismethodwasverifiedbyanalysisandexperimentofanelectricallythickcircularmicrostripan-tennawithanairgap.BasedonthefreespaceelectricdyadicGreen’sfunction,thefieldexpressionofanhorizontalelectricdipole(HED),whichislocatedatanypointofthemultilayermediaandpointsinanydirection,hasbeenderived.ByusingthisfieldexpressionandtheRichmondre-actionequation,anintegralequationintermsofelectriccurrentonthepatchisformulated.Byproperlychoosingcurrentexpansionmodes,thismethodcanbeusedforanelectricallythickmi-crostripantenna.Thetheoreticalresultsagreeverywellwithexperimentaldataforanelectricallythickcircularmicrostripantennawithanairgap.

简介：Anechoicchambersareusedforindoorantennameasurements.Thecommonmethodofconstructingananechoicchamberistocoverallinsidewallsbytheelectromagneticabsorbers.Inthispaper,afullymetallicsphericalchamberstructureispresentedinwhichthepropagationoftheelectromagneticwavesinsidethechamberiscontrolledandtheyareguidedtoanabsorber.Intheproposedmethod,anappropriatequietzoneisobtained,andunlikeordinaryanechoicchambers,theabsorberusageamountisreducedgreatly.Theperformanceofthechamberisevaluatedbysimulation.Theresultsshowthattheproposedmethodcouldprovideausefultechniquefortheindoorantennameasurements.

简介：Anewultra-wide-band(UWB)hornantennabasedonthenonradiativedielectricwaveguide(NRD-guide)wasproposedtosolvetheproblemofUWBantennas,TEMhornsforexample,generallysufferfromlargesideleakage.Theruleofthetheoreticalselectionofitsparameters,ifNRD-guideisusedastheUWBantennas,isstudiedfirstly,thentheradiationcharacteristicsforanopen-endedNRD-guidearecalculatedbyFDTD(finite-differencetime-domain)method.

简介：Inthisarticleabridgebetweentheexpectedcomplexityandperformanceofspheredecoding(SD)isbuilt.TheexpectedcomplexityofSDforinfinitelatticesistheninvestigated,whichnaturallyistheupper-boundofthoseforallthefinitelatticesifgivenbythesamechannelmatrixandsignalnoiseratio(SNR).SuchexpectedcomplexityisanimportantcharacterizationofSDinmulti-antennasystems,becausenomatterwhatmodulationschemeisusedinpractice(generallyithasfiniteconstellationsize)thisupper-boundholds.AbovebridgealsoleadstoanewmethodofdeterminingtheradiusforSD.Thenumericalresultsshowboththerealvalueandupper-boundofaveragesearchednumberofcandidatesinSDfor16-QAMmodulatedsystemusingtheproposedsphereradiusdeterminingmethod.MostimportantofallnewunderstandingsofexpectedcomplexityofSDaregivenbasedonabovementionedtheoreticanalysisandnumericalresults.

简介：OptimizationofantennaarraypatternusedinaspaceborneSyntheticApertureRadar(SAR)systemisconsideredinthisstudy.Arobustevolutionaryalgorithm,Non-dominatedSortingGeneticAlgorithms(theimprovedNSGA-Ⅱ),isappliedonaspaceborneSARantennapatterndesign.Thesystemconsistsoftwoobjectivefunctionswithtwoconstraints.Paretofrontsaregeneratedasaresultofmulti-objectiveoptimization.AfterbeingvalidatedbyatestproblemZDT4,thealgorithmsareusedtosynthesizespaceborneSARantennaradiationpattern.ThegoodresultswithlowAmbi-guity-to-SignalRatio(ASR)andhighdirectivityareobtainedinthepaper.

简介：Anovelmethodfordesigningabeam-switchingantennawiththeplanedipoleispresented.Theantennaiscomposedofdoubledipolesplacedatthecenterofanactivesquarestructurethatisdividedinfourequalsectorsbymetallicsheets.Metallicpatchesattheoutsideofthestructureareusedtoenhancetheradiationperformanceoftheantenna.Ineachstep,thediodesinonesectorareon,whereasotherdiodesareoff.Thesectorwithoff-statediodesdefinesthedirectionoftheradiationpattern.AnantennamodelisdesignedonthesubstrateofFR4.Theproposedantennaoperatesfrom4.8GHzto5.5GHzwithgainof6.3dBiandF/B(fronttobackratio)of13.2dBiwhentheoperatingfrequencyis5.2GHz.Theantennaradiationpatterncanbesweptintheentireazimuthplaneinfourstepswitha3dBbeamwidthof90.Theresultsrevealthattheantennacouldbeusedinthebasestationofthewirelesscommunicationsystems.

简介：这篇文章介绍一个新奇放射模式有六种横梁选择的可配置的天线，哪个在5.2GHz无线本地区域网络(WLAN)的工作频率乐队。设计天线有好阻抗在反响的频率匹配。横梁能被重新设置到六个不同方向，并且六个方位角模式的每片主要脑叶让一半驱动大约60污潳瀠敲敳瑮摥敲轼的横梁宽度(HPBW)吗？？

简介：Consideringtheshortcomingsoftheexistingvehicle-to-vehicle(V2V)communicationantennas,thispaperproposesaregularhexagonbroadbandmicrostripantenna.ByloadingshortingpinsandetchingV-shapeslotswithdifferentsizeateachangleoftheregularhexagonpatch,itrealizesimpedancematchingandobtainsbetterimpedancebandwidth.Thesimulatedresultsshowthattherelativebandwidthofthisantennareaches35.55%,coversthefrequencybandof4.74GHzto6.79GHz.Theantennaacquiresanomni-directionalradiationpatterninthehorizontalplanewhoseoutofroundnessislessthan0.5dB.Inaddition,theantennaismanufacturedandtested,whosetestedresultsarebasicallyconsistentwithsimulatedresults.Becausetheheightofantennais3mm,itiseasytobehiddenonroofofavehicleforV2Vcommunication.

简介：Fabry-Perot共鸣器(FPR)天线在微波和毫米波浪发现了宽应用并且最近吸引了可观的兴趣。在这篇论文，平面、圆柱的结构的一篇摘要，分析模型和研究，开发被介绍，并且在这些结构之间的比较和分析模型被做显示出那象FP洞模式的如此的分析模型，电磁的乐队差距(EBG)缺点模式，传播线模式，并且当适用分析这类共鸣器天线时，漏波浪的模式是一致的。在最近的研究下面的一些有趣的话题，包括双或多乐队，获得带宽的改进，低侧面和横梁控制，被调查。