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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
