基于分形与分布加载的带陷波超宽带天线

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1、摘要GHz'-15．88GHz，相对带宽达136．3％，实现了较好的宽带特性。为了更好的获取本文提出的陷波效果，分别采用接地面开一U形缝隙和辐射元周围添加一贴片的方法，实现天线对5．15GHz"--'5．825GHz干扰频段的抑制。仿真和实测结果表明，这两款天线的特性阻抗具有很好的带阻特性，增益的抑制性能较好，对于干扰频段的增益抑制最大值分别达到5．89dB和9．30dB。综上所述，我们针对宽缝隙微带线馈电和微带线一槽线馈电结构，尝试了树状分形、Sierpinski分形、Hilbert分形、十字形等多种新颖的结构，并用等效参量法、分

2、布加载调控技术和口径耦合技术等先进手段做出了系列改进，有关成果已经申报国家发明专利，设计的天线可以满足超宽带通信系统的要求，阻抗带宽特性较好，对C波段通信系统和WLAN系统的频段具有较好的抑制效果，并且本文所做的工作，对丰富超宽带天线理论和技术具有一定的参考价值和应用价值。关键词：超宽带天线；分形；分布加载；陷波；缝隙结构ⅡAbstractUltra-Widebandtechnologyisoneofthehottopicsofthepresentstudies．Specially,afterFCCregulationsfrom3．

3、1GHzto10．6GHzbandforcivilianbandin2002，ithasbeingpaidextensiveattentionbyresearchersathomeandabroad．ThemainspecificationsofUWBantennadesignincludeimpedancematchingwiththeinternalofultrawide-band，goodradiationcharacteristicsandsteadygains，aSwellaSantennaminiaturization,

4、eaSyinstallation,lowlossandhighefficiency．Inthemeanwhile，inordertoavoidinterferingwiththeexistingspectraC-bandcommunicationsystems(3．7GHzto4．2GHz)andWLANsystems(5．15GHzto5．825Gnz)，ultra-widebandantennasshouldhavethebandrejectionfunction．Inthisthesis，mainlyfortheproblem

5、sexistinginthedomesticandinternationalstudyofultra-widebandantennas，fourkindsofUWBantennasaredesignedandtheirperformancesaleanalyzedwithsimulationsandexperomentalresults．ConsideringtheadvantagesofthefractaltreestructuresuchaSprimitiverecursivewidthcoverage，eaSytuning，w

6、eproposethewideslotultra-widebandantennasbaSedonthetreefractalfirst．Bychangingthesizeofbranchesandwideslot,frequencybandblockfrom3．7GHzto4．2GHzand5．15GHzto5．825GHzareachievedsuccessfully．Analyzingandoptimizingtheantennastructureandprocess、析t11themethodofequivalentparam

7、eter,severalultra-widebandantennasbaSedonladder-shapedslotandcomplex-shapedslotweredesignedandproduced．TherelativebandwidthofthetwoantennasiSwidenedabout20％thantherectangularslot．Inordertogetthenotcheffecmentionedinthispaper,weusethedistributedloadtocontroltechnology,t

8、hroughoptimaldesignofcavitymoldtheory,toblockfrequencybandfrom5．15GHzto5．825GHz，thusachievedthedoublenotchfeature．BaS