本文關(guān)鍵詞：基于極化分集技術(shù)的WLAN MIMO天線設(shè)計　出處：《大連海事大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 無線局域網(wǎng) MIMO天線 極化分集 隔離度 饋電網(wǎng)絡(luò)

【摘要】：隨著無線通信技術(shù)的快速發(fā)展,用戶對無線網(wǎng)絡(luò)的需求不斷增加,現(xiàn)有的通信系統(tǒng)很難滿足需求,通信系統(tǒng)的容量、速率、可靠性亟待提高�，F(xiàn)階段,頻譜資源有限,通過增加系統(tǒng)帶寬來大幅度提高系統(tǒng)容量和速率已經(jīng)很難實現(xiàn),因此,當前研究的熱點方向是通過提高頻譜利用率來充分利用有限的頻譜資源。目前,提高頻譜利用率的一個有效的方法就是多輸入多輸出(MIMO)技術(shù)。為了提高無線局域網(wǎng)的吞吐量、傳輸距離以及可靠性,新一代無線局域網(wǎng)標準802.11n引入了MIMO技術(shù)。該技術(shù)對配套天線有兩個基本要求：一是天線能夠滿足MIMO系統(tǒng)的應(yīng)用要求,利用最小的空間取得較好的分集增益和復(fù)用增益,并解決天線間的隔離問題；二是天線制造成本低,結(jié)構(gòu)簡單,經(jīng)濟實用。為此,本文對WLAN MIMO天線的設(shè)計與實現(xiàn)方法進行了研究。 本文首先對無線局域網(wǎng)和MIMO技術(shù)進行了介紹,對多天線單元間的互耦進行了理論分析,給出了MIMO天線設(shè)計的要求。根據(jù)研究課題的要求,選用結(jié)構(gòu)簡單、成本低的微帶貼片天線結(jié)構(gòu)設(shè)計天線單元。為了提高天線的增益和阻抗帶寬,在微帶單元天線貼片上加載了耦合方形開口諧振環(huán)結(jié)構(gòu)。在此基礎(chǔ)上,本文設(shè)計了三款多極化WLAN MIMO天線。第一款天線是垂直/水平雙極化4元天線線陣,該天線采用正交雙饋電點饋電的方法實現(xiàn)雙極化,采用并聯(lián)饋電網(wǎng)絡(luò)結(jié)構(gòu)給天線陣饋電；第二款天線是±45°雙極化微帶,該天線通過運用矢量合成的方法,對縫隙耦合饋電的垂直/水平雙極化微帶天線進行了轉(zhuǎn)換,從而構(gòu)成了±45°雙極化微帶天線；第三款天線是雙圓極化天線陣,該天線采用2×2面陣結(jié)構(gòu)來改善天線的增益和方向性,饋電網(wǎng)絡(luò)采用同幅旋轉(zhuǎn)相移技術(shù)實現(xiàn)天線陣的雙圓極化特性。 本文采用理論設(shè)計與電磁仿真軟件仿真相結(jié)合的方法進行設(shè)計,并根據(jù)設(shè)計結(jié)果對天線進行了加工與測試。測試結(jié)果表明,本文設(shè)計的三款天線方向性好、增益高,隔離度高,且結(jié)構(gòu)簡單、成本低,滿足WLAN MIMO系統(tǒng)對天線的要求。
[Abstract]:With the rapid development of wireless communication technology, the user demand for wireless networks is increasing, the existing communication system is difficult to meet the demand, the capacity of the communication system, the rate of reliability need to be improved. At present, the limited spectrum resources, by increasing the bandwidth of the system can greatly improve the system capacity and rate has been difficult to achieve, so hot the direction of current research is through improving the utilization rate to make full use of the limited spectrum resource spectrum. Currently, an effective method to improve the utilization of the spectrum is the multiple input multiple output (MIMO) technology. In order to improve the throughput of wireless LAN, transmission distance and reliability, a new generation of wireless LAN standard 802.11n MIMO technology is introduced the technology has two basic requirements: one is for supporting the antenna antenna can meet the requirements of the application of MIMO system, made better use of diversity gain and minimum space Multiplex gain and solving the problem of isolation between antennas; two, antenna manufacturing is low cost, simple structure, economical and practical. Therefore, the design and implementation method of WLAN MIMO antenna is studied in this paper.
This paper first introduces the wireless LAN and MIMO technology, to the mutual coupling between antennas is analyzed, the MIMO antenna design requirements are given. According to the requirements of the subject, with simple structure, a microstrip patch antenna structure design of low cost antenna unit. In order to improve the antenna gain and impedance bandwidth at the microstrip patch of the antenna unit load on coupled square split ring resonator structure. On this basis, this paper designs three multi polarization WLAN MIMO antenna. The first antenna is a vertical / horizontal dual polarization antenna array is 4 yuan, the production method of orthogonal double antenna feed point feed to realize the dual polarization, the parallel feed network structure for the antenna array feed; the second antenna is + 45 degrees the dual polarized microstrip antenna, by using the method of vector synthesis, the vertical / horizontal slot fed dual polarized microstrip antenna for The conversion is made up of the 45 degree dual polarized microstrip antenna. The third antenna is a double circular polarization antenna array. The antenna uses 2 x 2 planar array structure to improve the gain and directivity of the antenna. The feed network adopts the same rotation phase shifting technology to achieve the dual circular polarization characteristics of the antenna array.
This paper uses the theory and design method of electromagnetic simulation software combined design, and according to the design results of the antenna is fabricated and measured. The test results show that the design of the three antenna directivity, high gain, high isolation, and has the advantages of simple structure, low cost, to meet the requirements of the WLAN antenna MIMO system.

【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN822

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相關(guān)期刊論文 前1條

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本文編號：1416462