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ID:33348399
大小:7.74 MB
页数:56页
时间:2019-02-25
《分形天线小型化研究 (1)》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要分形是通过迭代函数系统产生的具有自相似的分数维结构,分形的概念可用于天线设计以实现天线的尺寸减缩和多频特性,这在军用和民用方面都有着非常广泛的应用前景。绪论部分介绍了分形天线的产生背景、优点及其应用,国内外研究概况以及本论文的基本结构与框架。接着在第二章里,作者详细阐述了分形的概念和和定义,并结合迭代函数系统分析了几种典型的分形天线的生成,指出分形天线在国外的研究有着良好的发展趋势,在国内稍有落后。第三部分主要介绍了一种新型分形结构在低剖面天线中的应用。设计出了一种新型分形低剖面天线,并完成了仿真和加工测试等工作。最终结果表明,加工测试结果和仿真结果基本吻合,尺寸减缩效果明显
2、。在第四部分中,提出了一种准分形结构。针对偶极子的辐射特点,设计出新型准分形结构,研究了各阶分形对尺寸减缩的影响。在介绍了前面各部分的基础上,本论文在第五部分对课题阶段所做的工作进行了总结,并对后续研究工作进行了展望。关键词:分形天线天线小型化电小天线AbstractA“fractal”isarecursivelygeneratedstructurebyiteratedfunctionsystems.Ithasafractionaldimensionandpossessesaself-similarityproperty.Theconceptofa‘‘fractal’,hasbe
3、enappliedtoantennadesigninordertoreducethesizeofantennaandobtainmulti-bandfrequencyoperation.Fractalantennashavebroadapplicationprospectinmilitaryandcivilapplication.Firstofall,thedissertationpresentssomebasicknowledgeaboutthereconfigurableantennas,includingthebackground,advantages,applicatio
4、ns,thedevelopmentsketchofthisprojectintheworldwide.Ultimatelyintroducestheframeworkandcontentofthisthesis.Inthesecondchapterfollowing,theauthorelaboratesontheconceptofa“fractal”.Simultaneity,iteratedfunctionsystemsisappliedtoanalysisthistransformingprocessofafewrepresentative“fractal”antennas
5、.Intheendofthischapter,theauthorsummarizesthedevelopingsituationandpointoutthatthe‘‘fractal’’antennashavebeenobtainedagreatdealofproductionintheoverseaswhilebeginninginourcountry.Inthethirdpart,theapplicationsofanovelfractaliterationtechniqueinthedesignoflow-profileantennaispresented.Anovelfr
6、actallow-profileantennaisdesigned.Theproposedantennasarefabricatedandmeasured.Itisshownthatthemeasuredresultsareingoodagreementwiththesimulationresults.Thenovelfractalcharacteristicsreducethesizeoftheantennaobviously.Inthefourthpart,theauthorputforwardaquasi.fractalconstruction.Basedonthechar
7、acteristicofthedipole,theauthorputforwardanovelquasi.fractalconstruction.Theapplicationofdifferentordersonsizereductionhasbeenresearched.Finally,thesummaryabouttheresearchoftheprojectandtheexpectationaboutthefutureworkarepresented.Keywords:Fr
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