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1、双频宽带相控阵论文:基于MATLAB软件的双波段阵列天线设计【中文摘要】本文主要研究双频宽带宽角扫描相控阵。文中从阵列天线单元入手,介绍微带天线的一些基本理论和分析方法、馈电技术、宽频带、小型化、多频和宽波束方法,并基于这些综述方法,设计并仿真一个宽带宽波束天线和双频宽带宽波束天线单元。通过在宽带E型贴片天线外围增加一个铁盒子,减小辐射源面积,得到一个工作于1200MHz-1400MHz,波束宽带为±60°的微带天线单元。另外通过偶极子单元组合和馈电网络设计,得到一个工作于400MHz-480MH
2、z和1200MHz-1400MHz两个频段,且再两个频段内波束宽度都为±60°的双频宽带宽波束微带天线。然后,在介绍相控阵的一些基本理论和基本特性后,引入蔓延杂草优化算法,并首次将其引入非均匀相控阵综合,得到宽带宽角扫描双频相控阵,天线阵列在400MHz-480MHz和1200MHz-1400MHz的两个频率段都能扫描到±60°,而且在实空间没有出现栅瓣。但是阵列天线单元有源反射系数大,反射的能量较大。对有源单元方向图和有源反射系数,我们着重研究通过改变天线单元形式,减小单元之间的耦合,增加天线扫
3、描角度。即在偶极子天线的两个臂下面增加耦合单元,使其在E面满足±60°扫描波束,且对端口反射系数不产生较大影响;组成阵列时,阵列在±40°的扫描角度内有源反射系数都小于-10dB,比已有的偶极子扫描角度增加。【英文摘要】Dualband,widebandandwidescananglephasedarraysisstudiedinthisthesis.Forthearraysunit,themethodoffed,wideband,miniaturization,andmuti-frquency,
4、andwidebeamwidthandthebasictechnologyandanalysismethodofmicrostrippatchantennasisdiscussed.Basedonthemethod,wedesignandsimulateawidebandandwidebeamwidthmicrostripantennaandadualband,wideband,widebeamwidthmicrostripantenna.ByaddingaironboxoutsidetheEpa
5、tchantenna,whichcanreducingtheradiationarea,wegetanantennathatworksatthefrequencybandform1200MHzto1400MHzanditshalf-powerbeamwidthis±60degreebetweenthisband.Also,bycomprisingtwoprinteddipoleanddesigningsuitablefeednetwork,wegetanantennaworksbetween400
6、MHz-480MHzand1200MHz-1400MHzanditshalf-powerbeamwidthisalso±60degreebetweenthistwobands.Then,afterintroducingsomebasictheoryandsimplecharacteristicsofphasedarrays,wefirstintroducetheInvasiveWeedOptimization(IWO)intothesynthesisofnon-uniformlyphasedarr
7、ayandgetadualband,widebandandwidescananglephasedarrays.Thephasedarrayscansteerto±60degreeat400MHz-480MHzand1200MHz-1400MHzandnogratinglobeappearintherealspace.However,theactivereflectioncoefficient(ARC)ofthearraysunitisbig,mostoftheenergyisreflectingt
8、othefeedport.Fortheactiveelementpattern(AEP)andactivereflectioncoefficient(ARC),wetrytoreducethecouplebetweentheunitsbychangingtheshapeoftheantennatoincreasethescanangle.AsingleprinteddipolewithtwoparasiticmonopoleelementstobroadentheE-planera