請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/10266
標題: | 洩漏抑制之背覆導體共面波導之設計及其天線應用 Design of Leakage Suppressed Conductor-Backed Coplanar Waveguide and Its Antenna Applications |
作者: | Ju-Hung Chen 陳如弘 |
指導教授: | 陳士元 |
共同指導教授: | 許博文 |
關鍵字: | 共面波導,週期結構, Coplanar waveguide,periodic structure, |
出版年 : | 2011 |
學位: | 博士 |
摘要: | 本論文提出以週期結構合成的洩漏抑制之背覆導體共面波導及其天線應用。
文中首先介紹以往解決背覆導體共面波導能量洩漏問題的各種方法,然後提出利 用週期結構的分析方法所設計的降低洩漏效應之三種背覆導體共面波導傳輸線結 構。接著利用吾人設計的傳輸線去饋入共面貼片天線,以提高其輻射效率並降低 交叉極化位準。相對於以往的各種解決方法,透過本設計,無論是結構複雜度以 及製作成本均可大幅降低。由於其平面結構且無須使用金屬連通柱,本設計因而 極為適合應用在微波與毫米波電路上。 接著,探討各種利用背覆導體共面波導饋入的平面天線,其中包含一個圓形 共面貼片天線、兩個雙開槽的槽孔天線與一個側板貼片天線。針對圓形共面貼片 天線,吾人透過實驗與模擬確認圓形共貼片天線的工作模態與微帶線饋入的圓形 貼片天線相互對應,並且針對連通柱的使用對此天線特性的影響作詳細探討,吾 人發現,如果沒有嚴重的側板共振現象,其實是不需要使用連通柱的,因為對天 線效能的改善非常有限。接著,吾人提出以背覆導體共面波導饋入之雙開槽的偶 極天線與環形槽孔天線,並與傳統共面波導饋入的天線做比較。吾人發現:在後者 的設計中,除了環形槽孔本身的共振外,共面貼片的共振模態也同時存在於該天 線結構中。此外,吾人也利用前述的洩漏抑制之背覆導體共面波導饋入以上兩種 天線,並對其初步模擬結果做簡要地探討。最後,本論文提出側板貼片天線並與 微帶線饋入之類似結構進行分析比較,吾人發現儘管饋入傳輸線不同,該天線依 然具有相近的效能。 Novel leakage-suppressed conductor-backed coplanar waveguides with periodic structures are proposed in this dissertation, and their antenna applications are also presented. First, several previous works dealing with the leakage problem in conductor-backed coplanar waveguides are briefly reviewed. Based on the analysis of the periodic structure, three leakage-suppressed conductor-backed coplanar waveguide structures are proposed. Then, it is demonstrated that using the proposed transmission lines as the feed line for the coplanar patch antenna could result in higher antenna efficiency and lower cross-polarization levels. Compared with the previous works, using the proposed leakage-suppressed structures can significantly reduce not only the structure and design complexities but also the fabrication cost. The uni-planar and via-free structures make the proposed designs very attractive in the microwave and millimeter wave integrated circuits. The second half of this dissertation deals with several conductor-backed coplanar waveguide-fed planar antennas, including a circular-shaped coplanar patch antenna, two bilateral slot antennas, and a side plane patch antenna. For the first design, the operation mechanism is shown both numerically and experimentally to be very similar to that of the circular-shaped patch antenna fed by microstrip line. Besides, the via-loading effect on the performance of the coplanar patch antenna is also investigated. As the side plane resonances become insignificant, it thus makes no difference to use via-holes because the improvement in the antenna performance is very limited. Then, the bilateral slot dipole and slot loop antennas are designed and compared with the coplanar waveguide-fed ones. In the latter design, it is found that besides the desired slot loop resonance, the coplanar patch resonance also exists in this design. In addition, we use the aforementioned leakage-suppressed CBCPWs to feed the two slot antenna, and some preliminary simulation results are discussed. Finally, the side plane patch antenna is presented and compared with that fed by microstrip line. Comparable performance could be observed between them in spite of the different feeding structures. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/10266 |
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 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-100-1.pdf | 4.37 MB | Adobe PDF | 檢視/開啟 |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。