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研究生： 許礎峰
Hsu, Chu-Feng
論文名稱： 應用於IEEE 802.11a/b/g雙頻帶操作之寄生元件印刷單極天線
Printed Monopole Antennas with Parasitic Elements for IEEE 802.11a/b/g Dual-Band Application
指導教授： 李炳鈞
Li, Bing-Jing
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 電機工程學系
Department of Electrical Engineering
論文出版年： 2007
畢業學年度： 95
語文別： 中文
論文頁數： 70
中文關鍵詞： 寄生元件 、單極天線
外文關鍵詞： Parasitic Elements, Monopole Antennas
相關次數： 點閱：71  下載：3 
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    • 由於IEEE 802.11a/b/g(2.4-2.484 GHz 與5.15-5.35 GHz) 與ISM(5.75-5.825 GHz)分別在2.4GHZ與5GHz的兩個頻帶已經普及化了，所以使得雙頻印刷單極天線受到更多的重視，但因印刷單極天線本身具有窄頻寬的問題，為了解決此一問題，故在本論文裡提出了具有寄生元件的平面雙頻單極天線，且有增加頻寬操作的能力，由這個單極天線的結構中，提供了兩個不同的共振模態，其中較長的輻射金屬片控制較低頻的共振頻率，而較短的輻射金屬片控制了較高頻的共振頻率，寄生元件則貢獻在5.2GHz的模態中，此平面單極天線是以50Ω微帶線以印刷的方式由基板的中心饋入。以FR4為基板的天線提供兩個相異的阻抗頻寬，分別是低頻段的390 MHz與高頻段的1370 MHz，天線低頻增益為3.96-5.5dBi與高頻增益為0.89-3.38dBi；而氧化鋁基板天線的低頻頻寬為480MHz，而高頻頻寬為1170 MHz，天線低頻增益為1.22-1.31dBi與高頻增益為1.48-1.71dBi，且均保持在能夠覆蓋IEEE 802.11a/b/g與ISM。

    Due to the widespread popularity of IEEE 802.11a/b/g (2.4-2.484 GHz and 5.15-5.35 GHz) and ISM(5.75-5.825 GHz) in both the 2.4GHz and 5GHz bands, dual-band printed monopole antennas have received more and more attention. Printed monopole antennas have the disadvantages of narrow antenna bandwidth. In order to cope with the problem of the narrow bandwidth of printed monopole antenna. In this paper, a planar dual-band monopole antenna with a parasitic element and capable of broad-band operation is proposed. The two resonant modes of the proposed antenna are associated with various length of the monopoles, in which a longer strip controls the lower resonant frequency and a shorter strip controls the higher resonant frequency. The parasitic element contributes to the resonant modes 5.2 GHz. The 50Ω microstrip line is used to feed the planar monopole antenna, and is printed on the same substrate. The antenna of FR4 substrate can provide two separate impedance bandwidths of 390 MHz (about 15.9% centred at 2.45 GHz) and 1370 MHz (about 26% centred at 5.2GHz). The antenna gains on FR4 are 3.96-5.5 and o.89-3.38 dBi for 2.4 and 5.2 GHz bands, respectively. On Al2O3 substrate in the 2.4 GHz band, the 10 dB bandwidth is about 480 MHz. In the 5.2 GHz band, the 10 dB bandwidth is about 1170 MHz. The antenna gains on Al2O3 are 1.22-1.31 and 1.48-1.71 dBi for 2.4 and 5.25GHz bands, respectively. Making it easily cover the required bandwidths for IEEE 802.11a/b/g and ISM. Details of the proposed antenna design and experimental results are presented and discussed.

    中文摘要................................................................I 英文摘要...............................................................II 誌謝..................................................................IV 目錄...................................................................V 表目錄...............................................................VIII 圖目錄................................................................IX 第一章 前言............................................................1 1.1研究背景...........................................................1 1.1.1無線區域網路之規格介紹........................................1 1.1.2無線區域網路與天線............................................2 1.2文獻導論...........................................................3 1.3內容提要...........................................................4 第二章 天線理論及特性..................................................7 2.1天線簡介...........................................................7 2.2天線之特性參數介紹.................................................8 2.2.1天線輸入阻抗(Input Impendence)與電壓駐波(VSWR)................8 2.2.2天線增益(Gain)與指向性(Directivity)..............................9 2.2.3天線輻射效率(Antenna Radiation Efficiency).......................11 2.3偶極天線..........................................................12 2.3.1偶極天線理論.................................................12 2.3.2折疊形偶極天線...............................................14 2.4單極天線..........................................................15 2.4.1鏡像原理.....................................................15 2.4.2單極天線理論.................................................17 2.4.3折疊形單極天線...............................................19 2.5寬頻天線設計與原理................................................20 第三章 天線實驗方法...................................................23 3.1設計方法與原理....................................................23 3.1.1天線設計概念.................................................23 3.1.2天線結構.....................................................25 3.2高頻軟體模擬與天線製作流程........................................26 3.2.1高頻軟體模擬HFSS之簡介......................................26 3.2.2天線實體製作流程.............................................28 3.3天線量測儀器簡介..................................................30 3.3.1網路分析儀...................................................30 3.3.1.1誤差分析.................................................31 3.3.1.2單埠(1-Port)的量測誤差原因及校正..........................32 3.3.2無反射實驗室.................................................32 第四章 天線模擬與實驗結果.............................................34 4.1接地板對天線特性的影響............................................34 4.2天線主電路的參數模擬..............................................36 4.2.1雙共振路徑電路與接地面的距離(L1)..............................36 4.2.2 低頻段2.4GHz的參數操作......................................37 4.2.2.1參數L3...................................................38 4.2.2.2參數L4...................................................39 4.2.2.3參數L5...................................................40 4.2.3高頻段5.2GHz的參數操作......................................41 4.3寄生元件..........................................................42 4.3.1寄生元件與天線共平面.........................................43 4.3.2寄生元件尺寸對天線特性的影響.................................44 4.4介質基板對天線特性的影響......................................46 4.4.1介質基板之參數說明...........................................46 4.4.2 更改氧化鋁(Al2O3)為基板......................................47 4.5 Smith Chart與輻射場形圖的模擬.....................................49 4.5.1 輻射場形圖的模擬與分析.......................................49 4.5.2 Smith chart 模擬分析與分析....................................50 4.6天線實驗結果......................................................54 4.6.1 以FR4為基板的天線實驗結果...................................54 4.6.2以氧化鋁(Al2O3)為基板的天線實驗結果...........................60 第五章 結論...........................................................66 參考文獻...............................................................68

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