【摘要】：隨著第三、四代移動(dòng)通信網(wǎng)絡(luò)的成熟與普及,移動(dòng)終端設(shè)備得到快速的發(fā)展,天線作為終端設(shè)備接收無線信號(hào)的前端部件,也發(fā)生著巨大的變化,隨著手機(jī)功能增多,金屬機(jī)身流行,以及MIMO天線技術(shù)的應(yīng)用,終端天線不僅要滿足小型化、寬頻化、多頻帶的技術(shù)要求,而且還要克服金屬機(jī)身對(duì)天線輻射性能的惡化影響,設(shè)計(jì)具備多種功能的多天線(multi-antenna)系統(tǒng)。根據(jù)上述需求與挑戰(zhàn),本文提出了三款共用金屬邊框的終端MIMO天線設(shè)計(jì)方案。首先,本論文分析了終端天線發(fā)展以及國內(nèi)外研究現(xiàn)狀,總結(jié)了終端天線設(shè)計(jì)所面臨的挑戰(zhàn),以及本論文的研究重點(diǎn)和創(chuàng)新之處。然后結(jié)合天線理論知識(shí),對(duì)用于終端MIMO天線設(shè)計(jì)的常用天線形式、實(shí)現(xiàn)小型化、寬頻帶方法、MIMO天線性能衡量指標(biāo)以及實(shí)現(xiàn)MIMO天線高隔離的常用方法進(jìn)行歸納。其次,本論文提出一款共用金屬邊框的雙WIFI天線,金屬邊框同時(shí)作為兩天線的主要輻射結(jié)構(gòu),利用去耦結(jié)構(gòu)提高天線單元之間的隔離度,隨后對(duì)天線的S參數(shù)、輻射特性、MIMO分集特性進(jìn)行測(cè)試。最后通過在單元天線1饋電端口設(shè)計(jì)匹配網(wǎng)絡(luò),有效增加天線單元1工作帶寬,實(shí)現(xiàn)WIFI/GPS同時(shí)覆蓋。再次,本論文提出一款共用金屬邊框的七頻可重構(gòu)MIMO天線。天線采用U形微帶線耦合饋電方式,激勵(lì)起由金屬邊框與地板構(gòu)成的金屬環(huán),利用環(huán)天線多模諧振特點(diǎn)以及開關(guān)可重構(gòu)技術(shù),實(shí)現(xiàn)天線四種工作狀態(tài)切換,最終覆蓋七個(gè)通信頻段。根據(jù)環(huán)天線電流分布特性,通過合理設(shè)計(jì)天線位置,實(shí)現(xiàn)MIMO天線在整個(gè)工作頻帶內(nèi)具有較好的隔離度。文章從電流分布圖、重要參數(shù)討論對(duì)天線工作原理進(jìn)行詳細(xì)分析,最后通過加工測(cè)試,對(duì)天線的輻射特性與分集特性進(jìn)行了評(píng)估。最后,本論文提出了一款用于完整金屬邊框終端的多天線系統(tǒng),該天線系統(tǒng)既包含LTE七頻天線又包含雙頻WIFI MIMO天線,三副天線共用完整金屬邊框作為天線結(jié)構(gòu)進(jìn)行輻射。LTE天線通用匹配網(wǎng)絡(luò)對(duì)端口進(jìn)行阻抗匹配,實(shí)現(xiàn)七個(gè)頻段覆蓋(GSM850/900/GSM1800/1900/UMTS2100/LTE2300/2500),WIFI天線采用被動(dòng)可重構(gòu)原理,實(shí)現(xiàn)2.4GHz與5.8GHz雙頻段覆蓋。隨后對(duì)天線的工作原理進(jìn)行了詳細(xì)分析,通過對(duì)天線模型加工測(cè)試,結(jié)合天線的仿真結(jié)果進(jìn)行對(duì)比分析,最終得到工作帶寬、隔離度、輻射效率、MIMO天線分集特性均滿足設(shè)計(jì)要求共用金屬邊框的終端天線系統(tǒng)。
[Abstract]:With the maturity and popularity of the third and fourth generation mobile communication networks, mobile terminal equipment has been rapidly developed. As the front-end component of terminal equipment receiving wireless signals, antenna has also undergone tremendous changes. With the increase of mobile phone functions, the popularity of metal fuselage, and the application of MIMO antenna technology, the terminal antenna should not only meet the needs of miniaturization and widening. To overcome the deterioration of radiation performance caused by metal fuselage, a multi-antenna system with multiple functions is designed. According to the above requirements and challenges, three MIMO antenna design schemes with common metal frame are proposed in this paper. Firstly, the development of terminal antenna is analyzed. Then, combined with antenna theory knowledge, the common antenna forms used in terminal MIMO antenna design are realized, including miniaturization, broadband method, performance measurement index of MIMO antenna and high isolation of MIMO antenna. Secondly, a dual WIFI antenna with a common metal frame is proposed. The metal frame is used as the main radiation structure of the two antennas. The isolation between the antenna elements is improved by using the decoupling structure. Then the S parameters, radiation characteristics and MIMO diversity characteristics of the antenna are tested. Thirdly, a seven-band reconfigurable MIMO antenna with a common metal frame is proposed in this paper. The antenna is fed by a U-shaped microstrip line to excite a metal ring composed of a metal frame and a floor. The multi-mode resonance characteristics of the ring antenna are utilized. According to the current distribution characteristics of the ring antenna, the MIMO antenna has a good isolation degree in the whole working frequency band by designing the antenna position reasonably. This paper discusses the working principle of the antenna in detail from the current distribution diagram and the important parameters. Finally, the radiation and diversity characteristics of the antenna are evaluated by processing and testing. Finally, a multi-antenna system for the terminal with complete metal frame is proposed, which includes both LTE seven-band antenna and dual-band WIFI MIMO antenna. Line radiation. LTE antenna general matching network matches the impedance of the port to achieve seven band coverage (GSM850/900/GSM1800/1900/UMTS2100/LTE2300/2500). WIFI antenna uses passive reconfigurable principle to achieve 2.4 GHz and 5.8 GHz dual band coverage. Then the working principle of the antenna is analyzed in detail, and the antenna model is processed and tested. Comparing with the simulation results of the MIMO antenna, the bandwidth, isolation, radiation efficiency and diversity characteristics of the MIMO antenna can meet the design requirements of the terminal antenna system with a common metal frame.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN820

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本文編號(hào)：2220172