小型化宽频带平面单极天线的设计

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1、韭鏖变通塞堂亟±堂位i金塞生塞埴蛋中文摘要摘要：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。平面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的小尺寸、宽频带的要求，因而受到广泛的关注。本论文为迸一步降低天线尺寸，增大天线的频带宽度，在分析现有平面单极天线特性的基础上，进行了大量的工作，研究出两种新型的平面单极天线，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．提出了一种辐射片开槽的平面单极天线，该天线明显地改善了矩形平面单极天线的谐振

2、性能，比不丌槽天线具有更宽的带宽。研究了地板对天线性能的影响，通过调整地板的尺寸与位置，进一步扩展了矩形平面单极天线的带宽。2．提出了一种地板丌弧形圆槽的超宽带圆形平面单极天线，明显地改善了圆形平面单极天线的性能，缩小了圆形平面单极天线的尺寸，扩展了圆形平面单极天线的带宽。实际制作并测试了上述两种天线，理论上的宽频带特性得到了实验结果的验证。研究结果表明上述两种拓宽频带方法能够有效增加平面单极天线的带宽，减小了天线的尺寸。关键词：平面单极天线：开槽技术；宽频带天线：超宽带天线；小型化：微带线馈电分类号：TN82l+．3；TN822+．8jE瘟室煎厶堂亟±堂位论塞△旦§!B△

3、￡工ABSTRACTAntennaswithsmallVSWR，ommi—directionalmdimion，sinailsize，simplestructure，lightweightandlowcost，areveryattractivefornowadayscommunicationapplications．Theplanarmonopoleantennasnotonlyhavethesemeritsbutalsohavethepropertiesofwideband，lowprofile，andeasilyconnectingtomicrostriplinefee

4、dingnetwork．Therefore，planarmonopoleantennassatisfythesmallsizeandbroadbandrequirementoftoday’Scommunicationterminal．So，planarmonopoleantennasattractmoreandmoreattentions．Inordertogetsmallersizeantennasandfurtherimprovethebandwidth,thisthesisconductsmanyworksbasedontheanalysisoftheexisting

5、referencesaboutplanarmonopoleantennas．Twonewkindsofplanarmonopoleantennasareproposed，fabricated，andmeasured．Themeasuredresultsareinwellagreementwiththesimulatedresults．Thecreativeworksofthisthesisare：1．Anewkindofplanarmonopoleantennaswithslotcutintheradimionpatchisputforward．TheresonaneA：p

6、erformanceisimprovedbytheslotandfrequencybandofthisplanarmonopoleantennaiswiderthanthatwithoutslot．Theeffectsofgroundplatesizeontheantennapropertyarestudied．ThebandwidthoftherectangularplanarmonopoleantennasCallbeexpandedbyadjustingthesizeandlocationofthegroundplate．2．Anewkindofuitra-wideb

7、andcircularplanarmonopoleantennawithcirculararcslotcutinthegroundplateisputforward．Theresonanceperformanceofthiskindofantennaisimprovedsignificantlybythecirculararcslot．Thesizeofthiskindofantennaisfurtherreducedandthebandwidthisfurtherexpanded．Theproposedanten