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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/9773
標題: | 背覆導體共面波導饋入開槽天線之設計 Design of Slot Antennas Fed by Conductor-Backed Coplanar Waveguide |
作者: | I-Ching Lan 藍逸青 |
指導教授: | 許博文 |
關鍵字: | 背覆導體共面波導,開槽天線, Conductor-Backed Coplanar Waveguide,CBCPW,slot antenna, |
出版年 : | 2008 |
學位: | 博士 |
摘要: | 本論文提出了創新的背覆導體共面波導饋入之開槽天線,其中包括了三種耦合雙開槽天線以及兩種平行板開槽陣列天線。首先介紹的是背覆導體共面波導在開槽偶極天線這個不連續環境下產生的洩漏效應,然後藉由利用此洩漏波並適當設計開槽偶極天線與另一平直開槽天線的耦合,天線整體的輻射表現得以增進。接著提出的是開槽偶極天線與一弧形開槽天線的耦合結構,此一設計的天線尺寸比前一個設計來得小巧。緊接其後的是一個藉由截斷接地面與介質基板達成微小化的設計,其中截斷處的邊際電場扮演了耦合開槽天線在前述兩個設計中的角色,而天線整體表現也相似。
論文下半部轉而處理均勻的背覆導體共面波導傳輸線產生的平行板模態洩漏效應,並提出了兩種利用此洩漏波激發的平行板開槽陣列天線。為了達成線性極化,分別設計了一個縱向陣列天線與一個橫向陣列天線,並詳敘其設計流程。而前者優於後者之處也將在文中彰顯。這種型式的結構擁有在背覆導體共面波導基礎下設計大型陣列天線的潛力。 Novel slot antennas fed by the conductor-backed coplanar waveguide are proposed in this dissertation. These include three kinds of the coupled twin slots and two versions of the parallel-plate slot array. First the leakage effect at the slot dipole discontinuity of the conductor-backed coplanar waveguide is introduced. Then the slot dipole coupled with a straight slot is properly designed to utilize the leakage wave for enhanced radiation performance. Next, the slot dipole coupled with an arc-slot is presented, which is more compact than the previous design. After that, the miniaturized design with truncated ground planes and dielectric substrate is presented. The fringing fields at the truncation play the role of the coupling slot in the previous two designs. The overall performance is found to be comparable to its predecessors. The second half of this dissertation deals with the parallel-plate mode leakage from the uniform conductor-backed coplanar waveguide. Two parallel-plate slot arrays that are excited by this leakage wave are presented. To obtain linear polarizations, a longitudinal and a transverse slot array are designed and the procedures are detailed. The superiority of the former over the latter will also become obvious in the context. This type of structure has the potential for large array design based on the conductor-backed coplanar waveguide. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/9773 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 電信工程學研究所 |
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