博碩士論文 103521087 詳細資訊




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姓名 陳昱瑋(Yu-Wei Chen)  查詢紙本館藏   畢業系所 電機工程學系
論文名稱 利用低剖面金屬背腔單向輻射之寬頻圓極化槽孔天線設計
(Design of Unidirectional Wideband Circularly Polarized Slot Antenna with a Thin Metal Cavity)
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檔案 [Endnote RIS 格式]    [Bibtex 格式]    [相關文章]   [文章引用]   [完整記錄]   [館藏目錄]   至系統瀏覽論文 (2020-7-31以後開放)
摘要(中) 本論文以設計一應用衛星定位系統(GPS)之天線,一般衛星訊號接是以圓極化的方式來接收避免多重路徑反射的干擾以及法拉地旋轉的效應,操作頻帶主要以能覆蓋於L頻帶(1 GHz~2 GHz)中的GPS頻率為主。槽孔天線一般被廣泛應用在寬頻的圓極化的設計上,由於共面波導饋入的槽孔天線有其令人著迷的優點,像是寬頻,易於製作,簡單的單面結構,加入擾動結構能有效的產生圓極化,因此一開始我們採用了閃電型共面波導的饋入線,並在其左方空白處加入一個大與一個小的擾動結構設計出一S11與AR頻寬皆大於60%之天線。
由於槽孔天線雙向幅射的特性,在使用上較常考慮到向上的部分,因此為了抑制向下輻射提高上方增益,通常是在天線的下方距離四分之一波長處放置一反射板,而本論文提出的則是在反射板四周的邊牆上挖槽與在其上方貼上金屬貼片,將天線與反射板距離縮減到十六分之一波長來達到低剖面之設計。透過此反射板,可抑制背向輻射10 dB以上,提高增益至少3 dB,而本天線主要設計在L頻段(1 GHZ ~ 2 GHz),最後透過實作與量測得出與模擬有相符的結果。
摘要(英) In the thesis, designs of wideband circularly polarized slot antenna which covers the L band (1 GHz ~2 GHz) for Global Positioning System (GPS) applications are proposed. The coplanar waveguide (CPW) fed printed slot antenna has many desirable features like wide bandwidth, ease of fabrication, compact uniplanar configuration, increased freedom for applying perturbations and generating circularly polarization quite efficiently. First we use the Lightening-Shaped feedline and add the perturbation structure at the left side of the slot to design a wide band circular polarization slot antenna. It is found that -10-dB S11 bandwidth and 3-dB axial ratio bandwidth of the antenna are both over 60%.
Slot antennas are generally of bidirectional radiation. In order to achieve the unidirectional radiation, it is usually to apply a ground-plane reflector which is 0.25λ_0 under the antenna. In the thesis, we decrease the height to 0.0625λ_0 by add the slot around the side wall and metal patches around the cavity, and the low profile design has been achieved. With the back cavity, more than 10-dB in front-to-back ratio and more than 3-dB increase in the peak gain haven been obtained, at the price of the decrease in the axial ratio bandwidth.
關鍵字(中) ★ 圓極化
★ 槽孔天線
★ 低剖面
★ 金屬背腔
★ 單向輻射
★ 寬頻
關鍵字(英) ★ Circularly Polarized
★ Slot Antenna
★ Low Profile
★ Metal Cacity
★ Unidirectional
★ Wideband
論文目次 摘要 i
Abstract ii
致謝 iii
目錄 iv
圖目錄 vi
表目錄 viii
第一章 緒論 1
1-1 研究動機 1
1-2 文獻回顧 2
1-3 章節介紹 11
第二章 寬頻圓極化天線之設計與分析 12
2-1 寬頻圓極化天線之結構與發展 12
2-1-1 圓極化天線之概述 12
2-1-2 寬頻圓極化天線之設計理念 12
2-1-3 天線之結構與發展 13
2-2 天線之調整機制與參數分析 21
2-2-1 饋入線槽孔二長度(SS)之影響 21
2-2-2 擾動槽孔長度(PSlot_L)之影響 21
2-2-3 饋入線末端長度(Strip_L)之影響 22
2-2-4 小型擾動長度(LL)之影響 22
2-2-5 饋入線槽孔寬度(SS1)之影響 22
第三章 單方向高增益之天線設計 28
3-1 背蓋之結構與發展 28
3-1-1 背蓋之概述 28
3-1-2 背蓋之演近 31
3-2 背蓋各參數之分析與討論 37
3-2-1 右上方金屬貼片X方向長度(UR_X)之影響 37
3-2-2 右下方金屬貼片Y方向長度(LR_Y)之影響 37
3-2-3 左下方金屬貼片Y方向長度(LL_Y)之影響 37
3-2-4 背面槽孔長度之影響 38
3-2-5 右側上方槽孔長度之影響 38
第四章 量測結果 45
4-1 寬頻圓極化天線之量測與簡介 45
4-2 單方向高增益之寬頻圓極化天線量測與簡介 49
4-3 結論 56
第五章 總結 57
參考文獻 60
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[18] Baolin Cao, Dan Li, Yuan Zhao,Hao Wang and Yong Huang, " Axial ratio enhanced wideband circularly polarized aperture antenna with corner-truncated AMC reflector ", Advanced Materials and Processes for RF and THz Applications (IMWS-AMP), 2015 IEEE MTT-S International Microwave Workshop Series on
指導教授 丘增杰(Tsen-Chieh Chiu) 審核日期 2016-7-21
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