本文選題：MIMO手機(jī)天線 + PIFA天線　； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：MIMO(Mitiple-Input Mitiple-Output)技術(shù)被廣泛認(rèn)為是第四代LTE(Long Term Evolution)移動通信系統(tǒng)的核心技術(shù)之一。但是,由于手機(jī)天線的尺寸以及天線單元之間的互耦等因素的限制,MIMO技術(shù)在蜂窩移動通信中還很少實(shí)現(xiàn)商業(yè)應(yīng)用。同時,第四代LTE移動通信系統(tǒng)需要兼顧前三代的很多頻段,這就要求手機(jī)天線不僅要有較小的尺寸而且還要具備多頻段的特性。鑒于此,本文對小型化多頻段MIMO手機(jī)天線進(jìn)行了深入的研究。本文首先對PIFA天線的性能和多種實(shí)現(xiàn)天線小型化多頻段的技術(shù)進(jìn)行研究,為MIMO手機(jī)天線單元的設(shè)計提供了必要的理論基礎(chǔ)。其中重點(diǎn)研究了手機(jī)天線設(shè)計中耦合饋電技術(shù)、匹配電路加載技術(shù)、彎折線加載技術(shù)和集總電感加載技術(shù)在實(shí)現(xiàn)手機(jī)天線的多頻段、寬帶、小型化方面的積極作用。通過采用耦合饋電和彎折線加載技術(shù),創(chuàng)新性地設(shè)計了兩款小型化七頻段平面印刷手機(jī)天線。通過采用帶阻匹配電路加載和集總電感加載技術(shù),設(shè)計了一款小型化八頻段立體手機(jī)天線。仿真和測試結(jié)果表明該三款手機(jī)天線都具有很好的駐波和輻射性能。其次對地枝結(jié)構(gòu)去耦技術(shù)進(jìn)行了研究,并設(shè)計了一款小型化七頻段的MIMO手機(jī)天線。該MIMO天線單元的尺寸為325?10?4mm,天線單元的間距為10mm,通過一個由U形和兩對稱的L形金屬帶構(gòu)成的新型地枝去耦結(jié)構(gòu)為該天線進(jìn)行寬帶解耦。仿真和測試結(jié)果表明該MIMO手機(jī)天線的S11、隔離度、天線的輻射效率、3-D輻射方向圖以及ECC均滿足設(shè)計要求。最后對中合線去耦原理進(jìn)行了研究,并結(jié)合地枝結(jié)構(gòu)去耦技術(shù),設(shè)計了一款小型化七頻段MIMO手機(jī)天線。該MIMO天線單元的尺寸為328?10?4mm,天線單元的間距為4mm。為了實(shí)現(xiàn)天線單元良好的阻抗匹配以及實(shí)現(xiàn)天線高頻部分的解耦,在兩天線單元之間引入一個T形地枝結(jié)構(gòu)。此外,設(shè)計了一種新型帶有集總電感的U形中合線結(jié)構(gòu)來提高低頻部分的隔離度。仿真和測試結(jié)果表明在T形地枝結(jié)構(gòu)和U形中合線結(jié)構(gòu)的共同作用下,該天線單元之間的隔離度在七個頻段內(nèi)均高于10dB。
[Abstract]:MIMO(Mitiple-Input Mitiple-Output technology is widely considered as one of the core technologies of the fourth generation LTE(Long Term Evolution system. However, due to the limitation of antenna size and mutual coupling between antenna elements, MIMO technology is rarely used in cellular mobile communication. At the same time, the fourth generation LTE mobile communication system needs to take into account the previous three generations of many frequency bands, which requires that the mobile phone antenna not only has a smaller size but also has multi-band characteristics. In view of this, the miniaturized multi-band MIMO mobile phone antenna is studied in this paper. In this paper, the performance of PIFA antenna and various techniques to realize the antenna miniaturization and multi-band are studied, which provides the necessary theoretical basis for the design of antenna unit of MIMO mobile phone. Among them, the coupling feed technology, matching circuit loading technology, bending line loading technology and lumped inductance loading technology in the antenna design of mobile phone are mainly studied in the realization of multi-frequency band, broadband and miniaturization of mobile phone antenna. By using coupling feed and bending line loading technology, two miniature seven-band planar printed mobile phone antennas are designed innovatively. By using band-stop matching circuit loading and lumped inductance loading technology, a miniature eight-band stereo mobile phone antenna is designed. Simulation and test results show that the three mobile phone antennas have good standing wave and radiation performance. Secondly, the decoupling technology of ground branch structure is studied, and a miniaturized seven-band MIMO mobile phone antenna is designed. The size of the MIMO antenna unit is 325m 1010mm and the spacing of the antenna unit is 10mm. The antenna is decoupled by a new type of ground branch decoupling structure composed of U-shaped and two-symmetric L-shaped metal bands. The simulation and test results show that the S11, isolation, radiation efficiency and 3-D radiation pattern of the MIMO mobile antenna and ECC all meet the design requirements. Finally, the decoupling principle of the central line is studied, and a miniaturized seven-band MIMO mobile phone antenna is designed based on the ground branch structure decoupling technique. The size of the MIMO antenna unit is 328m 10mm and the spacing of the antenna unit is 4mm. In order to achieve good impedance matching of antenna elements and decoupling of the high frequency part of the antenna, a T-shaped ground branch structure is introduced between the two antenna elements. In addition, a novel U-shaped midline structure with lumped inductance is designed to improve the isolation of the low-frequency part. The simulation and test results show that the isolation degree between the antenna elements is higher than 10 dB in seven frequency bands under the joint action of T-shaped ground branch structure and U-shaped midline structure.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN828.6

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 俞鈺峰;應(yīng)用于無線通信的小型化天線研究[D];浙江大學(xué);2013年

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本文編號：1831623