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ID:32244117
大小:2.59 MB
页数:39页
时间:2019-02-02
《单极天线设计和地研究》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、中文摘要驻波系数小、全向性能好、且尺寸小、结构简单、重量轻、成本低的天线在现代通信系统中很受欢迎。单极天线不仅具有上述特点,同时具有频带宽、剖面轮廓低、易与微带馈电网络连接等优点,满足现代通信中移动终端对天线小尺寸、宽频带的要求,因而收到广泛关注。本文为进一步扩展天线带宽,增加超宽带天线的阻带,在分析现有单极天线特性的基础上,进行了大量的工作,研究出两种新型单极天线,并进行了实际制作和测试,测试结果与理论结果吻合较好。本文所做的创新性工作有:1.提出了一种辐射体中心开孔的圆片形单极天线,该天线明显地改善了圆形单极天线的谐振性能,比不开孔的圆形天线具有更宽的带宽;研究
2、了该天线的阻带特性,通过在辐射体上增加圆弧形槽使天线具有阻带特性,对WLAN频段的信号进行有效的过滤,避免相互干扰。2.提出了一种新型阶梯式单极子天线,该天线通过采用层级式馈电结构,使天线馈源处电流连续分布,从而改善了天线的匹配情况。对以上两种天线均做了数值仿真,并实际制作和测试了第一种天线,理论上的宽频带特性得到了实验的验证。实验结果表明,这两种天线都能用于超宽带通信系统。关键词:单极天线,开槽技术、超宽带天线、宽频带天线、微带馈电、小型化AntennaswithsmallVSWR,ommi—directionalradiation,smallsize,simpl
3、estructure,lightweightandlowcost,areveryattractivefornowadayscommunicationapplications.Theplanarmonopoleantennanotonlyhasthesemeritsbutalsohasthepropertiesofwideband,lowprofile,andeasilyconnectingtomicrosrtiplinefeedingnetwork.Therefore,planarmonopoleantennassatisfythesmallsizeandbroad
4、bandrequirementoftoday'scommunicationterminal.So,planarmonopoleantennasattractmoreandmoreattentions.Inordertowidenthebandofantennasandgetbandstop,thisthesisconductsmanyworksbasedontheanalysisoftheexistingreferencesaboutmonopoleantennas.Twonewkindsofmonopoleantennasareproposed,fabricate
5、dandmeasured.Themeasuredresultsareinwellagreementwithsimulatedresults.Thecreativeworksofthisthesisale:1.Anewkindofcicularmonopoleantennawithaneyeletinthecenteroftheradiationisproposed.Theresonanceperfomtmaceisimprovedbytheeyeletandthefiequencebandofthismonopoleantennaiswiderthanthatwit
6、houteyelet.Band-notchedcharacteristicsarerealizedbyinsertingslotsonradiators,SOthattheantennacallavoidpotentialinterferencewithsomespecialfrequencybands.2.AnovelmuRistepmonopoleantennaisproposed.MethodofmultistepfeedingisadoptedtomakeSUrethatthecurrentiscontinuousatthefeedingdistrictan
7、dtheimpedancematchingisimproved.Bothofuponantennas剐『csimulatedbynumericalsoftware.Furthermore。thecircularmonopoleantennaisfabricatedandmeasured.Thetheoreticalbroadbandcharacteristicsareverifiedbytheexperimentalresults.TheresultsshowthatbothoftheproposedantennasCallbeusedinUWBsystems.
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