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研究生： 陳德興
Te-Hsing Chen
論文名稱： 共平面波導寬頻圓型極化槽孔天線
Coplanar Waveguide Fed Broadband Circularly Polarized Square Slot Antenna
指導教授： 凃文化
We-Hua Tu
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 電機工程學系在職專班
Executive Master of Electrical Engineering
論文出版年： 2013
畢業學年度： 101
語文別： 中文
論文頁數： 102
中文關鍵詞： 寬頻帶 、圓極化 、共平面波導 、軸比 、槽孔天線
外文關鍵詞： Broadband, circularly polarized, coplanar waveguide, axial ratio, slot antenna
相關次數： 點閱：15  下載：0 
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    • 本論文主要提出一種新型結構，製作在單一層面的金屬介質基板RF4板材上。首先以單頻共平面波導槽孔天線做研習，之後設計出具有寬頻圓極化共平面波導(CPW)饋入槽孔天線。利用接地金屬環狀不對稱，使其電流分佈能激發出相鄰共振模態產生寬頻帶作用，在接地金屬環狀左內側彎沿出C形殘段，提供另一電流路徑使電場能有正交、等振幅以及90°相位差，在遠場輻射圓極化波，在接地金屬環狀右下角落嵌入一C形槽孔，以改善3-dB軸比頻帶寬度及10-dB阻抗頻寬。天線主體包含有共平面波導饋入線、輻射金屬貼片、非對稱接地金屬貼片、C形殘段及槽孔結構。量測結果，天線10-dB阻抗頻寬(VSWR 2)有0.92 GHz (46% 1.33－2.25 GHz)， 3-dB軸比(AR)頻寬有0.65 GHz (32.5% 1.55－2.2 GHz)，最大增益為 3.31 dBi變化範圍在1 dBi內，適合一般無線通訊產品(1.71－2.17 GHz)及導航系統(1.57－1.61 GHz)。

    This thesis describes the design with simplification structure and fabrication on the same plane of FR-4 substrate. At first studying the single band CPW-fed slot antenna, and then designing of proposed broadband circular polarization CPW-fed slot antenna, which is achieved by an asymmetry ground plane makes the adjacent resonant mode to merge into a wide operation bandwidth and etching C-shaped ground strip on the edge of left side of ground plane to offer the current path, two orthogonal electric fields with a 90°phase difference for exciting a circular polarization radiation wave. On the other hand, a C-shaped slot is embedded at the bottom right corner of ground plane. It is used for broadband AR and impedance matching. The measured impedance bandwidth (VSWR 2) is 0.92 GHz (46% relative to the center frequency at 2 GHz). The 3-dB axial ratio bandwidth (ARBW) is 0.65 GHz (32.5% relative to the center frequency at 2 GHz), and antenna peak gain is 3.31 dBi with variations of less than 1 dBi. This antenna is suitable for wireless communication system (1.71－2.17 GHz) and navigation system (1.57－1.61 GHz).

    摘要 I ABSTRACT II 致謝 III 目錄 IV 圖目錄 VII 表目錄 XII 第一章 緒論 1 1-1 研究動機 1 1-2 文獻回顧 3 1-3 章節介紹 9 第二章 天線原理及應用 10 2-1 傳輸線與共平面波導結構[23]-[24] 10 2-2 偶極天線介紹[26]-[27] 12 2-3 電磁波極化 16 2-3.1 線性極化 16 2-3.2 圓極化 16 2-3.3 橢圓極化 17 2-4 天線設計流程 19 第三章 共平面波導饋入寬頻圓極化槽孔天線使用C形結構與分析 21 3-1 共平面波導饋入槽孔天線結構與參數分析 23 3-1.1 天線一，輻射金屬貼片Fl間隙之分析 27 3-1.2 天線一，輻射金屬貼片Pl長度與Pw寬度之分析 28 3-1.3 結論 29 3-2 天線二，非對稱接地金屬環狀結構與參數分析 30 3-2.1 非對稱接地金屬環狀Sl 參數之分析 30 3-2.1 結論 31 3-3 天線三，C形殘段(tuning stub)結構與參數分析[18] 32 3-3.1 天線三，C形殘段Cs參數之分析 32 3-3.2 天線三，C形殘段Cg參數之分析 34 3-3.3 天線三，C形殘段Cw參數之分析 35 3-3.4 天線三，C形殘段Cl參數之分析 36 3-3.5 天線三，C形殘段Cd參數之分析 37 3-3.6 結論 38 3-4 天線四，C形槽孔結構與參數分析[19] 39 3-4.1 天線四，C形槽孔Sc參數之分析 40 3-4.2 天線四，C形槽孔Lr參數之分析 41 3-4.3 天線四，C形槽孔Lb參數之分析 41 3-4.4 結論 42 3-5 天線五，C形結構參數分析 43 3-5.1 天線五，C形槽孔Sc參數之分析 43 3-5.2 天線五，C形槽孔Lr參數之分析 45 3-5.3 天線五，C形槽孔Lb參數之分析 46 3-5.4 結論 48 3-6 天線量測與比較 49 第四章 共平面波導饋入寬頻圓極化槽孔天線使用倒L形接地殘段結構與分析 58 4-1 共平面波導饋入槽孔天線結構與參數分析 58 4-1.1 阻抗轉換器Fl與Fn參數分析 59 4-1.2 倒L形殘段Lv，Lh及Lg參數分析[18]-[19] 61 4-1.3 結論 64 4-2 天線量測與比較 65 第五章 結論 71 參考文獻 73 附錄 天線輻射場型量測步驟 77

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