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《移動(dòng)通信寬帶雙極化基站天線研究與設(shè)計(jì)》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、摘要摘要天線作為能量轉(zhuǎn)換的裝置在移動(dòng)通信系統(tǒng)中具有無(wú)可替代性，基站天線的良好運(yùn)行是整個(gè)通信系統(tǒng)正常工作的基本保障，它直接影響著移動(dòng)通信的服務(wù)質(zhì)量。隨著移動(dòng)通信質(zhì)量的不斷提高，對(duì)天線的要求也越來(lái)越高，基站天線應(yīng)當(dāng)具有良好的電路性能與穩(wěn)定的輻射性能，寬頻帶、雙極化、小型化等特點(diǎn)也是設(shè)計(jì)天線需要考慮的重要因素。本文就是基于寬頻帶、雙極化幾個(gè)方向來(lái)研究與設(shè)計(jì)滿足LTE頻段的基站天線。首先提出了一款±45°雙極化印刷偶極子基站天線，該天線采用雙倒L型耦合饋電結(jié)構(gòu)饋電來(lái)實(shí)現(xiàn)寬頻帶，另外對(duì)耦合微帶線進(jìn)行切角、增加橫向枝節(jié)
2、、改變開(kāi)路枝節(jié)寬度可以調(diào)節(jié)天線的阻抗匹配。并對(duì)天線單元進(jìn)行了實(shí)物加工和測(cè)試，結(jié)果顯示該天線能覆蓋1.7~2.7GHz頻段且輻射性能較好。還對(duì)該振子進(jìn)行了四單元組陣研究，重點(diǎn)研究了單層翻邊和雙層翻邊反射板對(duì)天線輻射特性的影響。然后設(shè)計(jì)了一款雙層印刷的超寬帶小型化基站天線，加載在輻射臂末端的調(diào)諧柱可以調(diào)節(jié)阻抗匹配，該天線整體結(jié)構(gòu)緊湊，是一款極有潛力的微蜂窩基站天線單元。對(duì)天線的結(jié)構(gòu)參數(shù)進(jìn)行了優(yōu)化并制作實(shí)物，實(shí)測(cè)結(jié)果顯示，天線在1.65~2.9GHz范圍內(nèi)的電壓駐波比VSWR<1.5，相對(duì)帶寬達(dá)到55%。最后借鑒
3、了喇叭天線和八木天線的原理提出了一種引向結(jié)構(gòu)的寄生單元，加載在天線上方后可以有效地改善天線的方向圖和增益。關(guān)鍵詞：基站天線；寬頻帶；雙極化；印刷天線；寄生單元I廣州大學(xué)碩士學(xué)位論文AbstractTheantennaasadeviceforenergytransformationisirreplaceableinthemobilecommunicationsystem,thegoodperformanceofbasestationantennaisthebasicguaranteeforthewholeco
4、mmunicationsystemtoworknormally,whichdirectlyaffectstheservicequalityofmobilecommunication.Withtheimprovementofthequalityofmobilecommunication,therequirementsforantennasarealsoincreasing,andbasestationantennasshouldhavegoodcircuitperformanceandstableradiat
5、ionperformance.Broadband,dualpolarizationandminiaturizationarealsoimportantfactorstodesignantenna.ThisthesisisbasedonthebroadbandanddualpolarizationtostudyanddesignthebasestationantennathatmeetstheLTEfrequencyband.Firstofall,abroadband±45°dual-polarizedpri
6、nteddipolebasestationantennaisdesignedwhichisfedbydoubleinverted-Lprobes,andtheimpedancematchingoftheantennacanbeadjustedefficientlybycuttingtheangleofmicrostripline,addingthebranchandchangingthewidthoftheopenbranch.Theantennaelementisprocessedandmeasured,
7、theresultsshowthattheantennacancoverthe1.7~2.7GHzfrequencybandandithasexcellentperformanceinradiationpattern.hefour-elementarrayantennaisalsosimulated,andtheeffectsofsinglelayerflangedreflectoranddoubleflangedreflectorontheradiationperformanceoftheantennai
8、semphaticallystudied.Secondly,adouble-layerprintedultra-widebandminiaturizedbasestationantennaisdesigned.Thetuningrodsloadedattheendoftheradiationarmscanadjusttheimpedancematching,thisantennahasacompactstruct
