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研究生： 鄭鈞鴻
Jack Cheng
論文名稱： 超寬頻天線之設計與應用
指導教授： 丘增杰
Tsen-Chieh Chiu
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 電機工程學系
Department of Electrical Engineering
畢業學年度： 94
語文別： 中文
論文頁數： 100
中文關鍵詞： 超寬頻
外文關鍵詞： UWB
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    • 摘要
    本論文主要是在於探討超寬頻(Ultra-Wide Band, UWB)天線的設計以及馬刺狹孔(Spurline)在加強天線間隔離度(isolation)的應用。首先，利用共平面波導(Coplanar Waveguide, CPW)的結構作為此超寬頻天線的饋入電路，再設計出反射損耗值( )在UWB頻段(3.1GHz~10.6GHz)皆小於-10dB的超寬頻天線，並成功地實際製作於FR4的微波基板上。將模擬值與量測值加以比較，發現其有良好的一致性。此外在論文中，將二個超寬頻天線並列在一起，且此二個天線共用其共平面波導的接地平面，利用馬刺狹孔其類似帶拒濾波器(Bandstop Filter)的特性，來降低天線間共接地平面上的電流，因而提高特定頻率的天線隔離度。此結構亦實作於FR4基板上，並且成功地提高了在8.4GHz的隔離度，所量測的結果與模擬相當地吻合 。

    Abstract
    In the thesis, the design of Ultra-Wide-Band(UWB, 3.1GHz~10.6GHz) antennas and the application of the spurline on the isolation enhancement between antennas are discussed. The antennas are first designed using IE3D full-wave electromagnetic simulator, and then fabricated on the FR4 printed-circuit board. Measured return loss, which is better than 10dB from 3.1GHz to 10.6GHz, is in good agreement with simulation.
    To increase the isolation between two UWB antennas, a spurline filter is placed on the edge of the common ground of the antennas. The edge current excited due to the radiation of the antennas is successfully reduced by the spurline. The design is also fabricated on FR4 substrate. The measured isolation increases about 10dB at 8.4GHz and is in good agreement with simulation.

    目錄 中文摘要 ……………………………………………………………I Abstract ……………………………………………………………II 致謝 …………………………………………………………………III 目錄 …………………………………………………………………IV 圖目錄 ………………………………………………………………VII 表目錄 ………………………………………………………………XIII 第一章 序論 …………………………………………………………1 1.1 研究動機 ………………………………………………………1 1.2 論文概述 ………………………………………………………2 1.3 論文綱要 ………………………………………………………2 第二章 超寬頻天線設計 ……………………………………………4 2.1 簡介 ……………………………………………………………4 2.2 共平面波導簡介 ………………………………………………6 2.2.1 共平面波導之結構 ………………………………………6 2.2.2 共平面波導之優點 ………………………………………7 2.3 超寬頻天線設計 ………………………………………………8 2.3.1 天線設計流程 …………………………………………8 2.3.2 超寬頻天線設計尺寸的決定 …………………………11 2.3.3 超寬頻天線的實作與模擬 ……………………………22 2.4 結語 ……………………………………………………………32 第三章 超寬頻天線的討論 …………………………………………33 3.1 共平面波導饋入網路的影響 …………………………………33 3.1.1 共平面波導的接地平面討論 …………………………33 3.1.2 共平面波導的接地平面的變化影響 …………………34 3.1.3 改良之超寬頻天線的實作與模擬 ……………………38 3.2 不對稱的共平面波導饋入網路的影響 ………………………48 3.2.1 橋接(Air-Bridge)的影響 …………………………………48 3.2.2 不對稱之超寬頻天線的設計 …………………………48 3.3 結語 ……………………………………………………………59 第四章 馬刺狹孔(Spurline)的應用 ………………………………61 4.1 二天線間距離的耦合效應之探討 ……………………………61 4.2 馬刺狹孔(Spurline)的放置討論 ……………………………66 4.2.1 向右彎曲之馬刺狹孔的討論 …………………………66 4.2.2 向左彎曲之馬刺狹孔的討論 …………………………75 4.3 結語 ……………………………………………………………80 第五章 結論 …………………………………………………………81 參考文獻 ……………………………………………………………82 附錄A …………………………………………………………………84

    參考文獻
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