4G移動(dòng)通信中的MIMO天線設(shè)計(jì)與性能研究
發(fā)布時(shí)間：2018-09-09 18:45
【摘要】：隨著傳輸速率和通信質(zhì)量的提高,頻譜資源稀缺和多徑衰落等問題日益突出,MIMO系統(tǒng)可充分利用空間資源,有效地提高傳輸速率和頻譜利用率。隨著手機(jī)超薄化、智能化的發(fā)展趨勢(shì),手機(jī)等移動(dòng)終端中留給天線的空間越來越小,且4G網(wǎng)絡(luò)需同時(shí)兼容2G、3G網(wǎng)絡(luò),這就需要MIMO天線不僅要尺寸小還需具備較寬的頻帶。同時(shí),金屬邊框的引入嚴(yán)重影響了智能機(jī)內(nèi)置天線的阻抗匹配和輻射性能,這大大增加了MIMO終端天線的設(shè)計(jì)難度。本文結(jié)合已有文獻(xiàn)詳細(xì)分析了幾款小型化寬頻化天線設(shè)計(jì)方案,并在此基礎(chǔ)上提出了三款智能機(jī)MIMO天線的設(shè)計(jì)方案。首先,本文提出了一款基于混合去耦結(jié)構(gòu)的多頻段智能機(jī)MIMO天線的設(shè)計(jì)方案,天線單元由耦合饋電的環(huán)形天線和單極子天線組成,由中和線和突出地組成的混合去耦網(wǎng)絡(luò)大大提高了MIMO系統(tǒng)的隔離度,且天線結(jié)構(gòu)簡(jiǎn)單、緊湊,易于加工。然后,本文提出了一款基于環(huán)天線的金屬邊框智能機(jī)MIMO天線設(shè)計(jì)方案,金屬邊框被分為四部分,通過倒L型饋電枝節(jié)耦合饋電分別在天線的低頻段和高頻段產(chǎn)生諧振,與內(nèi)置耦合環(huán)天線共同實(shí)現(xiàn)了對(duì)WWAN/LTE頻段的覆蓋,且兩個(gè)天線單元分別在系統(tǒng)基板的兩個(gè)角落,實(shí)現(xiàn)了良好的隔離效果。最后,本文提出了一款基于Monopole天線的金屬邊框智能機(jī)MIMO天線的設(shè)計(jì)方案,天線單元由金屬邊框與彎折型Monopole天線組成,金屬邊框通過Monopole耦合饋電諧振在低頻段,Monopole天線與金屬邊框的高階諧振點(diǎn)共同覆蓋天線的高頻段,通過在地板上加載彎折開槽線,MIMO系統(tǒng)的隔離度得到明顯提高。本文對(duì)所提出的三種設(shè)計(jì)方案的可行性均進(jìn)行了實(shí)驗(yàn)驗(yàn)證,測(cè)試結(jié)果表明三款天線均能滿足帶寬、隔離度及輻射性能的要求;為分析天線與人體之間的相互作用,對(duì)其中兩款天線進(jìn)行了手頭模型的仿真,結(jié)果表明天線性能穩(wěn)定,SAR值低,滿足實(shí)際工程需求。
[Abstract]:With the improvement of transmission rate and communication quality, the problems of spectrum scarcity and multipath fading are becoming more and more important. MIMO systems can make full use of space resources and effectively improve the transmission rate and spectrum efficiency. With the thinning of mobile phones and the trend of intelligent development, the space left to antennas in mobile terminals such as mobile phones is becoming smaller and smaller, and 4G networks must be compatible with 2GN 3G networks at the same time, which requires MIMO antennas not only to be small in size but also to have a wide frequency band. At the same time, the introduction of metal border seriously affects the impedance matching and radiation performance of the built-in antenna of the smart machine, which greatly increases the design difficulty of the MIMO terminal antenna. In this paper, several design schemes of miniaturized broadband antennas are analyzed in detail, and three MIMO antennas for smart machines are proposed. First of all, this paper presents a design scheme of multi-band smart machine MIMO antenna based on hybrid decoupling structure. The antenna unit is composed of a coupling fed ring antenna and a monopole antenna. The hybrid decoupling network, which consists of neutralization line and outburst, greatly improves the isolation of MIMO system, and the antenna structure is simple, compact and easy to process. Then, a design scheme of metal frame smart machine MIMO antenna based on ring antenna is proposed. The metal border is divided into four parts, which generate resonance in the low frequency band and high frequency band of the antenna by coupling the feed segments of the inverted L type. The WWAN/LTE band coverage is realized together with the built-in coupling loop antenna, and the two antenna elements are in two corners of the system substrate respectively, and the good isolation effect is achieved. Finally, a design scheme of metal frame smart machine MIMO antenna based on Monopole antenna is proposed. The antenna unit is composed of metal frame and bending Monopole antenna. The metal border is fed by Monopole coupling resonance in the high frequency band of the antenna and the high order resonance point of the metal frame. The isolation degree of the Monopole system is obviously improved by loading the curved slotted line on the floor. Experimental results show that the three antennas can meet the requirements of bandwidth, isolation and radiation performance. The simulation results of two antennas on hand show that the antenna performance is stable and the SAR value is low, which meets the practical engineering requirements.
【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)】：TN828.6
本文編號(hào)：2233249
[Abstract]:With the improvement of transmission rate and communication quality, the problems of spectrum scarcity and multipath fading are becoming more and more important. MIMO systems can make full use of space resources and effectively improve the transmission rate and spectrum efficiency. With the thinning of mobile phones and the trend of intelligent development, the space left to antennas in mobile terminals such as mobile phones is becoming smaller and smaller, and 4G networks must be compatible with 2GN 3G networks at the same time, which requires MIMO antennas not only to be small in size but also to have a wide frequency band. At the same time, the introduction of metal border seriously affects the impedance matching and radiation performance of the built-in antenna of the smart machine, which greatly increases the design difficulty of the MIMO terminal antenna. In this paper, several design schemes of miniaturized broadband antennas are analyzed in detail, and three MIMO antennas for smart machines are proposed. First of all, this paper presents a design scheme of multi-band smart machine MIMO antenna based on hybrid decoupling structure. The antenna unit is composed of a coupling fed ring antenna and a monopole antenna. The hybrid decoupling network, which consists of neutralization line and outburst, greatly improves the isolation of MIMO system, and the antenna structure is simple, compact and easy to process. Then, a design scheme of metal frame smart machine MIMO antenna based on ring antenna is proposed. The metal border is divided into four parts, which generate resonance in the low frequency band and high frequency band of the antenna by coupling the feed segments of the inverted L type. The WWAN/LTE band coverage is realized together with the built-in coupling loop antenna, and the two antenna elements are in two corners of the system substrate respectively, and the good isolation effect is achieved. Finally, a design scheme of metal frame smart machine MIMO antenna based on Monopole antenna is proposed. The antenna unit is composed of metal frame and bending Monopole antenna. The metal border is fed by Monopole coupling resonance in the high frequency band of the antenna and the high order resonance point of the metal frame. The isolation degree of the Monopole system is obviously improved by loading the curved slotted line on the floor. Experimental results show that the three antennas can meet the requirements of bandwidth, isolation and radiation performance. The simulation results of two antennas on hand show that the antenna performance is stable and the SAR value is low, which meets the practical engineering requirements.
【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)】：TN828.6
【參考文獻(xiàn)】
相關(guān)碩士學(xué)位論文 前5條
1 胡少啟;應(yīng)用于4G通信的小型化多頻段寬帶手機(jī)天線研究[D];安徽大學(xué);2016年
2 楊彥麗;用于金屬邊界智能機(jī)的多頻段MIMO天線[D];電子科技大學(xué);2016年
3 陳忠祥;用于LTE智能機(jī)的MIMO天線技術(shù)研究[D];電子科技大學(xué);2015年
4 強(qiáng)云飛;應(yīng)用于LTE智能機(jī)的窄邊框天線技術(shù)研究[D];電子科技大學(xué);2015年
5 景躍騏;多頻段LTE手機(jī)天線研究[D];西安電子科技大學(xué);2014年
，本文編號(hào)：2233249
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