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研究生： 詹詩怡
SHIH-YI CHAN
論文名稱： 應用於無線通訊的Meander-Line 天線
The Application of Meander-Line Antenna to Mobile Communication
指導教授： 徐敬文
Ching-Wen Hsue
口試委員: 魏炯權
Jiong-Quan Wei
黃進芳
Jhin-Fang Huang
黃正亮
C.L.Huang
學位類別： 碩士
Master
系所名稱： 電資學院 - 電子工程系
Department of Electronic and Computer Engineering
論文出版年： 2005
畢業學年度： 93
語文別： 中文
論文頁數： 71
中文關鍵詞： Meander-line 天線 、三頻天線
外文關鍵詞： Meander-line anenna, triple band antenna
相關次數： 點閱：244  下載：4 
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  •  上一筆

    • 本論文主要在探討Meander-line型式的天線，天線實作方法是使用將輻射金屬線直接印刷在基板上的技術，使得天線具有輕薄短小的優點，且容易與電路基板相結合，提昇製作的便利與降低成本的特性，
    在本文中實作一支應用在GSM、DCS、ISM頻段的三頻天線。天線的設計過程中，會先依書本或文獻為依據，找出最佳架構。接著以高頻模擬軟體HFSS來求證是否準確，再以印刷電路板雕刻出天線的形狀。接著利用網路分析儀量測其反射損耗及阻抗頻寬，最後再以電磁無反射室量測實做天線的反射損耗與遠場之輻射場型。

    The type of Meander-line antenna are proposed and experimentally studied. The antenna materialized by the way that printed on dielectric substrates. The advantages of this method are low profile, light weight, easy construction and easy to integrated with circuit substrates, which not only reduces the manufacturing cost but also decreases the required size of the complete system.
    This thesis we materialize a triple band antenna. The triple band are GSM-900、DCS-1800 and ISM-2.4 . The antenna has been constructed based on theories from textbooks and papers, which also verified by commercial electromagnetic simulation software-HFSS. The measured input impedance, return loss and radiation pattern are presented and discussed.

    目錄 中文摘要………………………………………………………………Ⅰ 英文摘要………………………………………………………………Ⅱ 誌謝……………………………………………………………………Ⅲ 圖表索引………………………………………………………………VII 第一章 緒論 ………………………………………………………… 1 1.1 研究動機……………………………………………………….. 1 1.2 一些常用的商用頻段規格…………………………………….. 2 1.3 內容大綱……………………………………………………….. 2 第二章 基本天線理論………………………………………………… 3 2.1微帶天線………………………………………………………... 3 2.1.1微帶天線簡介…………………………………………….. 3 2.1.2微帶天線理論…………………………………………….. 4 2.2單極天線(Monopole)…………………………………………... 8 2.2.1雙極天線(Dipole)…………………………………………. 8 2.2.2 鏡像原理………………………………............................10 2.2.3 單極天線…………………………………………………12 2.3 介質對天線的影響…………………………………………….15 2.4 共振定義……………………………………………………….20 第三章Meander-line 天線理論分析………………………………..…..22 3.1 Meander-line偶極天線架構與等效模型介紹………..…………22 3.2 Shortening ratio (SR)縮減比例……………………………….....28 3.3 Q值與頻寬的關係………..……………………………………..33 3.3.1 Electrically Small Antenna觀點…………………………..33 3.3.2共振腔觀點………………………………………………..35 3.4 Meander-line天線應用………………………………………....38 第四章Meander-line天線結構分析…..…………………………………42 4.1彎折段數與共振阻抗…..……………………………….………42 4.2影響Meander-line 天線頻寬因素………………..……….……46 4.2.1介質板厚度…………………..………..…………………..46 4.2.2 接地共平面波導饋入………………………..…………...48 4.3倍頻效應………………………………………………...………..50 4.3.1 Meander-line天線的倍頻效應…………………..…….…50 4.3.2 介質基版厚度對倍頻效應的影響………………..……...52 第五章 理論與實測結果分析……………….…………………….……53 5.1 實驗設計 ………………………………………..……………...53 5.1.1 天線增益量測方法……………………………….……...54 5.2 量測結果………..………………………………………………55 5.2.1 N=3 Meander-lime天線介質板厚度…………………..55 5.2.2 N=3 Meander-lime天線倍頻效應……………………..58 5.2.3 Meander-lime三頻天線………………………………..60 5.2.4 接地共平面波導饋入(CPWG)…………………………65 第六章 結論……………………………………………………….…….66 參考文獻……………………………………………………………..…..68 圖表索引 圖2-1 微帶天線的基本結構……………………………………........3 圖2-2 微帶天線共振腔模型……………………………………........4 圖2-3 偶極天線電流分佈圖…………………………………………8 圖2-4(a) 電流源垂直分量……………………………………………..11 圖2-4(b) 鏡像電流等效模型…………………………………………..11 圖2-5(a) 電流源水平分量……………………………………………..12 圖2-5(b) 鏡像電流等效模型…………………………………………..12 圖2-6 單極天線橫切面圖…………………………………………..13 圖2-7 在自由空間的單極天線………………………..……………15 圖2-8 埋覆在介質中的單極天線…………………………………..15 圖2-9 有限大介質空間中的單極天線…………………………..…16 圖2-10 介質平面版天線模型…………………………..……………17 圖2-11 FR4板單極天線結構( 、共振頻率1.8 )..........18 圖2-12 矩形微帶天線實部和虛部共振阻抗圖................................20 圖3-1 Meander-line偶極天線架構圖………………………………22 圖3-2 Meander-line偶極天線分析模型……………………………23 圖3-3 Zigzag 偶極天線基本架構.....................................................28 圖3-4 Zigzag偶極天線與線性偶極天線輸入阻抗………………..29 圖3-5 Zigzag偶極天線的輻射場形………………………………...30 圖3-6 Zigzag偶極天線輸入阻抗…………………………………...31 圖3-7 Meander-line偶極天線輸入阻抗……………………………32 圖3-8 Wheeler Cap示意圖………………………………………….33 圖3-9 與地垂直的ESA的修正Wheeler Cap………………………34 圖3-10 與地平行的ESA的修正Wheeler Cap………………………35 圖3-11 三頻Meander-line天線結構圖...............................................38 圖3-12 三頻Meander-line天線反射損耗圖........................................39 圖3-13 三頻Meander-line天線阻抗圖................................................40 圖3-14 三頻Meander-line天線電流分佈圖…………………………41 圖4-1 Meander line天線彎折定義─N…………………………….42 圖4-2 天線架構圖..............................................................................43 圖4-3 反射係數( )_基版厚度1.5mm……………………………44 圖4-4 不同厚度N=3天線結構……………………………………..46 圖4-5 不同厚度介質基版反射損耗圖............................................47 圖4-6 三頻天線結構………………………………………………..48 圖4-7 三頻反射損耗圖......................................................................49 圖4-8 N=3 Meander-line天線結構………………………………....50 圖4-9 N=3 Meander-line天線反射損耗圖………………………....51 圖4-10 N=3 Meander-line天線電流分佈圖…………………………51 圖4-11 不同厚度的Meander-line天線反射損耗圖…………………52 圖5-1 天線量測系統………………………………………………..53 圖5-2 N=3 Meander-line天線實作電路圖…………………………55 圖5-3 N=3 Meander-line天線架構圖………………………………55 圖5-4 N=3 Meander-line天線反射損耗圖…………………………56 圖5-5 N=3 Meander-line天線反射損耗圖實作與模擬比較………56 圖5-6 N=3 Meander-line天線(1.5mm)遠場場形量測圖…………..57 圖5-7 N=3 Meander-line天線反射損耗圖實作與模擬比較............58 圖5-8 反射損耗圖實作與模擬比較..................................................59 圖5-9 Meander-line三頻天線電路架構圖…………………………60 圖5-10 Meander-line三頻天線實作電路圖…………………………60 圖5-11 Meander-line三頻天線反射損耗圖實作與模擬比較............61 圖5-12 Meander-line三頻天線實作阻抗............................................61 圖5-13 Meander-line三頻天線遠場場形量測圖……………………64 圖5-14 三頻接地共平面波導饋入(CPWG)天線實作電路圖………65 圖5-15 反射損耗圖實作與模擬比較..................................................65

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