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研究生:林哲旭
研究生(外文):Che-Hsu Lin
論文名稱:應用於衛星訊號接收之車用圓極化天線設計
論文名稱(外文):Circularly Polarized Antenna Design for Mobile Reception of Satellite Signals in Automotive Applications
指導教授:林丁丙林丁丙引用關係
口試委員:蘇志銘丘建青曾昭雄林信標
口試日期:2012-07-03
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:電腦與通訊研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:81
中文關鍵詞:交叉偶極天線類均向輻射場型ONDAS衛星廣播系統
外文關鍵詞:crossed dipolequasi-isotropic radiation patternONDAS satellite broadcasting system
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本論文目的為設計創新的車用天線結構,應用於接收歐洲ONDAS衛星廣播系統訊號之用,其頻段使用範圍為S頻段(2.17 GHz~2.2 GHz),為求衛星訊號覆蓋率可達整個歐洲,因此衛星廣播系統通常會嚴格規範天線在特定仰角範圍內的平均增益值,分別在仰角90度為4 dBic,仰角75~45度為5 dBic,而仰角30度則為3 dBic,同時天線亦須符合車用測試規範於1米參考地平面上進行設計。
本文針對歐洲ONDAS衛星廣播系統的需求進行車用天線設計,主輻射體為具圓極化特性的交叉偶極天線結構,饋入端採用半硬質式同軸纜線將天線建置於參考地平面的中心點,並探討天線與地平面之間的距離對於輻射場型特性之影響。此外,為達衛星廣播系統的嚴苛規範,我們採用一步階式參考接地面架構藉由改變入射至地平面之反射波相位取得天線在各個仰角增益值的平衡點,最後天線端則運用特殊彎折以及傾斜的設計改善低仰角增益值不足的問題,經由模擬驗證及實際製作量測,我們所提之天線結構能符合ONDAS衛星廣播系統的規範,並在仰角90~30度之間具備了類均向性的輻射場型,可達到穩定的衛星訊號接收,並具實際產業應用上的價值。


The purpose of this paper is design of innovative antenna structure for reception of digital radio signals of ONDAS satellite broadcasting system within the S-band(2.17 GHz~2.2 GHz) in automotive applications, in order to achieve the reception of satellite signal which can cover the whole of Europe, the specifications and targets desired of the antenna is always more stringent than another satellite broadcasting system at specific elevation angles, the minimum average gain of +4 dBic is required at elevation angle 90, +5 dBic is required at elevation angle between 45-75 and +3 dBic is required at elevation angle 30, and the antenna should be designed above the 1-m ground plane
basis to the vehicle specification testing.
The proposed antenna is a circularly polarized crossed dipole antenna structure fed by a semi-rigid coaxial cable and mounted on the center of 1-m ground plane, first we analysis the influences on radiation pattern by varying the height between the crossed dipole antenna and the ground plane, and then a novel stepped ground plane structure is proposed to obtain an equilibrium point of average gain between high elevation angles and low elevation angles, finally, the main radiating element with a special bending and tilt design utilized to improve the average gain of the antenna at low elevation angles, the simulated results show a good agreement with the measured results to verify the proposed antenna can meet the specifications of ONDAS satellite broadcasting system, and the antenna has a quasi-isotropic radiation pattern at elevation angle between 30-90. Hence, the stable satellite signal reception can be achieved and the proposed antenna structure is suitable for practical application.


中文摘要 i
英文摘要 ii
誌謝 iv
目錄 v
圖目錄 vii
表目錄 xi
第一章 緒論 1
1.1研究背景與目的 1
1.2文獻探討 5
1.2.1 應用於衛星廣播系統之車用天線 5
1.3論文架構 8
第二章 天線理論介紹 9
2.1概述 9
2.2偶極天線 9
2.3單極天線 14
2.4偶極天線與單極天線之共振 15
2.5於理想地平面上方之基礎天線原理分析 16
2.6於非理想地平面上方之基礎天線原理分析 24
2.7旋轉場天線原理分析 29
2.8平衡-非平衡轉換器介紹 32
第三章 交叉偶極天線架構 34
3.1概述 34
3.2交叉偶極天線架構 36
3.2.1天線輻射場型 39
3.3基於一公尺接地面之交叉偶極天線架構 41
3.3.1天線輻射場型 41
3.3.2置入不同金屬結構於一公尺接地面上 44
3.3.3不同金屬結構參數探討與分析對於輻射場型之影響 45
3.3.4天線於一公尺步階式接地面之特性探討 52
3.3.5天線輻射場型 54
第四章 具類均向性之車用圓極化天線架構 56
4.1概述 56
4.2新型彎折式圓極化交叉偶極天線架構 57
4.2.1彎折式交叉偶極天線架構I 57
4.2.1.1天線輻射場型 58
4.2.2彎折式交叉偶極天線架構II 61
4.2.2.1天線輻射場型 62
4.3車用圓極化交叉偶極天線架構 65
4.3.1車用圓極化交叉偶極天線架構I 65
4.3.2車用圓極化交叉偶極天線架構II 71
第五章 結論 78
參考文獻 79


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