臺灣博碩士論文加值系統

本論文提出三種應用於WLAN有限接地面之MIMO天線設計，第一種天線設計，主要設計於智慧連網電視，架構包含模擬電視顯示器周遭金屬環境機殼、天線本體銅片立體摺疊金屬。首先，利用簡易平面倒F型天線( PIFA )架構設計WLAN頻帶MIMO天線，接著針對天線隔離度作改善，以相同的天線但不同的天線擺放位置比較，實驗顯示天線擺放方向與位置將影響天線隔離度與天線傳輸最佳化；第二種天線設計，利用兩個相互正交的饋入微帶線及接地面，接地面具有兩個矩形開槽孔和一個 I形閉槽孔設計，在兩饋入微帶線對稱接地面上設計I形閉槽孔，可減少兩輸入端相互耦合影響，能有效提升天線隔離度，且也同時提高低頻頻帶使其具有良好的匹配頻寬；第三種天線設計，是延續第二種應用WLAN頻帶MIMO槽孔天線所作的衍生，所使用的接地之板材尺寸和設計的方式並無太大差異，將饋入微帶線改變設計在矩形對角部分各挖一缺角邊邊上，天線以鏡射方式擺放，透過改變電流傳輸的形式，改變能量的分佈情形，藉以抑制各天線之間的破壞性干涉，並改善天線阻抗匹配與隔離度。

In this paper, three kinds of MIMO antenna design with limited ground plane for WLAN applications are presented. The first antenna design is mainly designed in Wisdom Network TV. The structure includes the metal environment enclosure of the analog TV display, and the antenna body. First, the WLAN azimuth MIMO antenna is designed with a simple planar inverted-F antenna ( PIFA ) architecture, and then the antenna isolation is improved with the same antenna but different antenna placement. The experiment shows that the antenna orientation and position will affect Antenna isolation and antenna transmission optimization; the second antenna design, the use of two mutually orthogonal feeding microstrip line and ground plane, ground plane with two rectangular slot and an I-shaped slot design, in the Two-feed microstrip line symmetrical ground surface design I-shaped slot, can reduce the two input coupling effect, can effectively enhance the antenna isolation, and also improve the low frequency band to have a good match bandwidth; Antenna design is the continuation of the second application of WLAN band MIMO slot antenna derived from the use of the ground plate size and design of the way is not much difference, the feeding microstrip line to change the design of the diagonal part of the rectangle On the edge of an angle, the antenna placed in a mirror way, by changing the form of current transmission, change the distribution of energy, in order to suppress the destructive between the antenna dry Involving and improving antenna impedance matching and isolation.

摘 要 i
ABSTRACT ii
誌 謝 iii
目 錄 iv
圖目錄 vi
第一章 緒論 1
1.1 研究動機 1
1.2文獻導覽 2
1.3 論文綱要 5
第二章 應用於WLAN頻帶電視之MIMO天線設計 6
2.1 概述 6
2.2 天線設計 7
2.3 實驗結果與參數探討 9
2.4 心得與討論 19
第三章 應用於WLAN頻帶MIMO槽孔天線設計 20
3.1 概述 20
3.2 天線設計 21
3.3 實驗結果與參數探討 23
3.4 心得與討論 31
第四章 應用於WLAN頻帶高隔離度MIMO槽孔天線設計 32
4.1 概述 32
4.2 天線設計 33
4.3 實驗結果與參數探討 35
4.4 心得與討論 43
第五章 結論 44
參考文獻 45

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