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論文名稱 Title |
以空氣為介質層之寬頻平板天線研究 STUDIES OF BROADBAND PATCH ANTENNAS WITH AN AIR SUBSTRATE |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
134 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2001-05-28 |
繳交日期 Date of Submission |
2001-06-04 |
關鍵字 Keywords |
寬頻帶操作、雙頻帶操作、降低交叉極化天線設計、微帶天線、縮小化微帶天線設計 BROADBAND OPERATION, COMPACT MICROSTRIP ANTENNAS, REDUCE CROSS-POLARIZATION, MICROSTRIP ANTENNAS, DUAL-FREQUENCY OPERATION |
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統計 Statistics |
本論文已被瀏覽 5698 次,被下載 0 次 The thesis/dissertation has been browsed 5698 times, has been downloaded 0 times. |
中文摘要 |
本論文的內容是針對以空氣為介質層之寬頻平板天線設計做研究、分析與探討。文中內容包含一些以空氣為介質層之寬頻天線設計。首先,具V形槽孔之雙頻帶操作平板天線設計,針對在三角形平板天線表面蝕刻一具V形槽孔可以造成雙頻的操作。接著研究是關於平板天線的寬頻帶設計,所提出的是使用蝕刻U形槽孔及兩寬直槽孔於平板天線的各項新型設計,這些設計其操作頻寬可以達到25%以上。此外,在降低交叉極化方面,針對以空氣為介質層之結構,提出已具180度相位差之雙饋入寬頻平板天線及具U形接地面之寬頻平板天線設計,來有效降低在H平面上交叉極化輻射,效果可達10至15dB,最後,使用H形槽孔饋入外加以接短路片的形式,可得到約26.2%的操作頻寬,且將天線輻射面積降為原本的40至50%。 |
Abstract |
Novel broadband designs of patch antennas with an air substrate have been proposed in this dissertation. In the dual-frequency design, the study of single-fed dual-frequency microstrip antenna with a V-shaped slot has been first presented. As for the broadband patch antenna design, antennas with a U-shaped slot or a pair of wide slits can have an operating bandwidth more than 2.0 times that of a conventional one at a given operating frequency. The antenna bandwidth of then can be enhanced about 25%. In the designs of reducing cross-polarization, by using dual capacitive feeds with equal input powers, but with a 180°-phase shift, The cross-polarization radiation can be reduce about 10 to 15dB in the H-plane. Finally, A broadband shorted patch antenna fed by an aperture-coupled feed with an H-shaped coupling slot is proposed. By using an air substrate of thickness about 0.07 free-space wavelength of the center operating frequency, the proposed antenna can have an impedance bandwidth of about 26.2%. And the antenna design reduced the antenna size to be 40%~50%of the simple case. |
目次 Table of Contents |
文 字 目 錄 文字目錄 -------------------------------------------------------------i 圖形目錄 -----------------------------------------------------------iii 表格目錄 ----------------------------------------------------------xiii 第一章 序論 (Introduction) ------------------------------------------------1 1.1 概述 -----------------------------------------------------1 1.2 文獻導覽 ---------------------------------------------------1 1.3 內容提要 ---------------------------------------------------2 第二章 具V形槽孔的雙頻平板天線設計 (Design of Dual-frequency Patch Antennas with a V-shaped Slot) -------5 2.1 概述 -------------------------------------------------------5 2.1.1 薄介質層雙頻平板天線的設計----------------------------5 2.2 設計概念 ---------------------------------------------------8 2.3 實驗結果與分析---------------------------------------------14 2.4 綜合討論 --------------------------------------------------20 第三章 具有U形槽孔之寬頻平板天線設計 (Design of Broadband Patch Antennas with a U-shaped Slot)------------21 3.1 概述--------------------------------------------------------21 3.2 設計概念 ---------------------------------------------------30 3.3 具U形槽孔之三角形平板天線設計-------------------------------31 3.3.1 天線結構----------------------------------------------31 3.3.2 實驗結果與討論----------------------------------------31 3.4 具U形槽孔之矩形平板天線設計---------------------------------39 3.4.1 天線結構----------------------------------------------39 3.4.2 實驗結果與討論----------------------------------------39 第四章 具兩寬直槽縫之寬頻平板天線設計 (Design of Broadband Patch Antennas with a Pair of Slits) -----------49 4.1 概述--------------------------------------------------------49 4.2 具一對寬直槽縫之矩形(E形金屬片)平板天線設計-----------------55 4.2.1 天線結構----------------------------------------------55 4.2.2 實驗結果與討論----------------------------------------55 4.3 具一對寬直槽縫之圓形平板天線設計----------------------------63 4.3.1 天線結構----------------------------------------------63 4.3.2 實驗結果與討論----------------------------------------63 4.4 電容耦合饋入之具一對寬直槽縫之圓形平板天線設計--------------70 4.4.1 天線結構----------------------------------------------70 4.4.2 結果與實驗討論----------------------------------------72 第五章 有效降低寬頻平板天線交叉極化之設計 (Cross-Polarization Reduction for Broadband Patch Antennas )---------79 5.1 概述--------------------------------------------------------79 5.2 設計概念 ---------------------------------------------------79 5.3 具有180°相差及單一輻射元件之雙饋入平板天線設計-------------80 5.3.1 天線結構----------------------------------------------80 5.3.2 實驗結果與討論----------------------------------------80 5.4 具有180°相差之1 ×2陣列平板天線設計------------------------88 5.4.1 天線結構----------------------------------------------88 5.4.2 實驗結果與討論----------------------------------------88 5.5 具有U形接地面之寬頻平板天線設計-----------------------------96 5.5.1 天線結構----------------------------------------------96 5.5.2 實驗結果與討論----------------------------------------97 5.6 具有倒p形接地面之寬頻平板天線設計--------------------------107 5.6.1 天線結構---------------------------------------------107 5.6.2 實驗結果與討論---------------------------------------107 第六章 寬頻槽孔耦合短路平板天線設計 (Broadband Aperture-Coupled Shorted Patch Antenna Design)-----------114 6.1 概述-------------------------------------------------------114 6.2 設計概念---------------------------------------------------114 6.3 天線結構---------------------------------------------------116 6.3 實驗結果與討論---------------------------------------------116 第七章 結論 (Conclusions)--------------------------------------------------123 參考文獻 (References)--------------------------------------------------------125 |
參考文獻 References |
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