双频单极子天线毕业论文

I摘要本设计介绍了射频双频单极子天线的基本原理以及基于HFSS的射频双频单极子天线的设计过程。双频天线一个最为简单的颁发就是采用印刷单极子天线来实现，这类天线所需成本极低，而且结构和加工都极为简易，是目前为止众多学者的研究方向。本篇论文主要设计与仿真射频双频单极子天线。半波偶极子天线和单极子天线是迄今为止应用较为广泛的天线。利用镜像原理，引入接地面可以将半波偶极子天线的长度减少一半，即1/4波长单极子天线。然后，文中设计并仿真了一个单极子天线，能够使用在无线局域网中。其L型单极子天线由微带线直接馈电，天线工作于IEEE802.11a和802.11b两个工作频段，实现了天线的双频工作特性。仿真结果表明，该天线低频单极子天线垂直方向长度等于19mm时，该单极子天线的双频振点，也就是高频振点对应IEEE802.11a（5.15GHz~5.825GHz），低频振点对应IEEE802.11b（2.4GHz~2.4825GHz），能够应用在无线局域网所涉及到到相关频段力，同时具备较佳的辐射方向图性质。关键词：双频单极子；射频；WLAN；HFSSIIDesignofRadio-FrequencyMonopoleAntennaABSTRACTThisdesignintroducesthebasicprinciplesofradiodual-bandmonopoleantennaandadual-bandradio-basedHFSSmonopoleantennadesignprocess.Printedmonopoleantennaasadual-bandantennaintheformofasimplestructure,easyprocessing,lowcost,isalsoahottopicintheantennafield.Inthisthesis,dual-bandmonopoleantennaRF.Theuseofimagetheory,theintroductionofgroundplanecanreducethelengthofthehalf-wavedipoleantennahalf,oraquarter-wavemonopoleantenna.Then,thepaperappliedtothedesignandproductionofadual-bandWLANprintedmonopoleantenna.TheantennaTheL-typemonopolemicrostriplinedirectlyfedantennaoperatinginthefrequencybandIEEE802.11aand802.11bbothworktoachievethecharacteristics.Measuredresultsshowthatthelow-frequencymonopoleantennaverticallengthequalto19mm,highfrequencyandlowfrequencyresonancepointofthedual-bandmonopoleantennadesignwerefallingIEEE802.11a(5.15GHz~5.825GHz)andIEEE802.11b(2.4GHz~2.4825GHz)workontheband,meettherequirementsofWLANband,andhasagoodradiationpatternIIIcharacteristics.Keywords:dual-bandmonopole;RF;WLAN;HFSSIV目录摘要................................................................................................................................IABSTRACT..........................................................................................................................II第1章绪论.......................................................................................................................11.1本论文的研究背景.................................................................................................11.2课题意义.................................................................................................................11.3双频天线研究现状.................................................................................................21.4天线设计中的软件介绍.........................................................................................31.5印刷天线与微带天线的差异.................................................................................41.6本论文主要工作及内容安排.................................................................................5第2章射频双频单极子天线相关理论.............................................................................52.1天线的概述.............................................................................................................52.2天线的电参数.........................................................................................................62.3半波偶极子天线.....................................................................................................82.4单极子天线.............................................................................................................82.5印刷天线.................................................................................................................92.6双频天线技术概述...............................................................................................102.7双频天线采用单一贴片的实现方法...................................................................11第3章射频双频单极子天线设计与仿真.......................................................................113.1.双频单极子天线的结构.......................................................................................123.2天线初始尺寸和HFSS设计概述.......................................................................133.3HFSS仿真设计.....................................................................................................153.3.1添加和定义设计变量................................................................................153.3.2添加新的介质材料....................................................................................153.3.3设计建模....................................................................................................163.3.4设置边界条件............................................................................................163.3.5设置激励方式............................................................................................173.3.6求解设置....................................................................................................173.4天线性能结果分析及优化...................................................................................183.4.1仿真设计结果............................................................................................183.4.2参数扫频分析R2对低频段谐振频率的影响..........................................183.4.3查看最终优化设计结果............................................................................19第4章结论.....................................................................................................................204.1全文总结.....................................................