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1、摘要GHz'-15.88GHz,相對帶寬達(dá)136.3%,實現(xiàn)了較好的寬帶特性。為了更好的獲取本文提出的陷波效果,分別采用接地面開一U形縫隙和輻射元周圍添加一貼片的方法,實現(xiàn)天線對5.15GHz"--'5.825GHz干擾頻段的抑制。仿真和實測結(jié)果表明,這兩款天線的特性阻抗具有很好的帶阻特性,增益的抑制性能較好,對于干擾頻段的增益抑制最大值分別達(dá)到5.89dB和9.30dB。綜上所述,我們針對寬縫隙微帶線饋電和微帶線一槽線饋電結(jié)構(gòu),嘗試了樹狀分形、Sierpinski分形、Hilbert分形、十字形等多種新穎的結(jié)構(gòu),并用等效參量法、分
2、布加載調(diào)控技術(shù)和口徑耦合技術(shù)等先進手段做出了系列改進,有關(guān)成果已經(jīng)申報國家發(fā)明專利,設(shè)計的天線可以滿足超寬帶通信系統(tǒng)的要求,阻抗帶寬特性較好,對C波段通信系統(tǒng)和WLAN系統(tǒng)的頻段具有較好的抑制效果,并且本文所做的工作,對豐富超寬帶天線理論和技術(shù)具有一定的參考價值和應(yīng)用價值。關(guān)鍵詞:超寬帶天線;分形;分布加載;陷波;縫隙結(jié)構(gòu)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