移動終端寬帶MIMO天線研究
發(fā)布時間:2018-05-25 16:31
本文選題:MIMO天線 + MIMO技術; 參考:《華南理工大學》2014年碩士論文
【摘要】:隨著無線通信技術的迅猛發(fā)展,消費者對無線通信業(yè)務的類型和質量的要求越來越高,,稀缺的頻譜資源已成為通信發(fā)展的一個瓶頸,而MIMO(Mitiple-Input Mitiple-Output,多輸入多輸出)技術能夠在不提高發(fā)射功率和增加帶寬的前提下,利用多個發(fā)射天線和接收天線組成的收發(fā)系統(tǒng)來減少信道衰落,并成倍地提高頻率利用率和系統(tǒng)容量。作為MIMO移動終端系統(tǒng)中的天線部分,要解決有限空間和放置多天線的矛盾、多天線之間隔離度和有限空間的矛盾,以及寬頻帶和天線尺寸之間的矛盾。因此設計具有寬頻帶高隔離度的移動終端MIMO天線具有重要的研究意義。 本文首先闡述了天線設計相關的基礎理論和性能指標,并對相關性系數(shù)、平均有效增益比等評估MIMO分集性能的參數(shù)做了系統(tǒng)的介紹,為下一步的工作奠定了基礎。 其次,提出了一種緊湊型G型雙枝節(jié)單極子平面寬帶MIMO天線,天線具有100%的帶寬,頻帶范圍是2.26-6.78GHz(|S11|≤-10dB),并且在通帶內|S21|≤-20dB。通過調整G型雙枝節(jié)天線單元的兩個枝節(jié)的諧振頻點,使其相互靠近,可以激勵出新的諧振模式并形成寬帶特性。然后,我們提出了一種倒L地板枝節(jié)和T型槽線相結合的新穎的辦法來提高天線單元間的隔離度。 而后,提出了一種多窄縫加載的寬帶U型縫隙MIMO天線,天線具有78%的相對帶寬,頻帶范圍是1.68-3.83GHz(|S11|≤-10dB),并且在通帶內|S21|≤-19dB。天線的創(chuàng)新處在于擴展帶寬的措施,我們在原來縫隙天線的基礎上加載了三對窄縫隙,每對窄縫隙可以新增一個新的諧振頻點。通過增加多個相互靠近的諧振頻點一方面可以改善阻抗匹配,一方面可以擴展帶寬。同時天線的相關性系數(shù)小于0.1,滿足MIMO分集性能,天線可以很好的應用在LTE/WiMAX等移動終端上。 最后,提出了一種用于LTE/GSM/UMTS的寬帶單平面手機天線,天線的帶寬為690MHz-2230MHz(|S11|≤-6dB)。天線低頻段諧振點通過耦合接地枝節(jié)產(chǎn)生,五邊形單極子一方面可以作為單極子天線,同時也可作為耦合驅動枝節(jié)。通過單極子天線和耦合接地枝節(jié)的共同作用,天線能夠產(chǎn)生寬頻帶特性。
[Abstract]:With the rapid development of wireless communication technology, consumers have higher and higher requirements for the types and quality of wireless communication services. The scarce spectrum resources have become a bottleneck in the development of communications. However, MIMO(Mitiple-Input Mitiple-Output (Mitiple-Output) technology can reduce channel fading and increase frequency utilization and system capacity by using multiple transmit antennas and receiving antennas without increasing transmission power and bandwidth. As the antenna part of MIMO mobile terminal system, it is necessary to solve the contradiction between limited space and multiple antennas, between the isolation degree of multiple antennas and finite space, as well as between broadband and antenna size. Therefore, the design of mobile terminal MIMO antenna with wide band and high isolation is of great significance. In this paper, the basic theory and performance index related to antenna design are introduced, and the parameters such as correlation coefficient and average effective gain ratio to evaluate the performance of MIMO diversity are introduced systematically, which lays a foundation for the next work. Secondly, a compact G-type bipolar monopole wideband MIMO antenna is proposed. The antenna has a bandwidth of 100%, and the band range is 2.26-6.78 GHz (S11 鈮
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