本論文之研究的目的在於寬頻多重輸入輸出(Multi-Input Multi-Output, MIMO)雷達天線的設計，MIMO雷達與傳統相位陣列雷達比較之下有好的物體偵測性、較精確的角度估算以及較低的速度偵測性能。基於以上MIMO雷達的優勢，以及文獻提出應用寬頻的訊號於雷達系統也能夠加強雷達的性能，本研究係設計一個寬頻單一指向性的MIMO天線應用於MIMO雷達系統之上。
為達成上述之天線性能要求，我們使用寬槽孔天線達成操作在C頻帶的寬頻需求；而單一方向輻射的特性則是利用電磁帶隙(electromagnetic band-gap, EBG)作為反射板使背向輻射的能量轉為正向。此外為達到MIMO的操作特性，天線之間的隔離度也是必須要考量的因素之一，因此我們利用一個平面螺旋形的槽線做為一個共振器來增強天線間的隔離效果。
本天線系統最終的阻抗百分頻寬為46.2％，並且在此頻寬內隔離度維持在15 dB以下。

This thesis investigates antenna design for wideband multi-input multi-output (MIMO) radar system applications. The advantages of MIMO radar are excellent in target detectable performance, good in angular estimation accuracy and decreased minimum detectable velocity ability. In recently proposed literature, using wideband signals could enhance the performance in detection for MIMO radar systems. Therefore we design a MIMO antenna with a wide frequency bandwidth and uni-directional radiation pattern for MIMO radars.
To achieve the requirement mentioned above, we adopt the wide-slot antenna for wide bandwidth that operates within C band and use electromagnetic band-gap (EBG) structure as reflector for uni-directional radiation to reflect energy into forward direction. Additionally, we introduce a spiral slot as a resonator to enhance the isolation for the sake of MIMO operations.
The impedance bandwidth of the proposed antenna system is 46.2% with uni-directional radiation pattern and the isolation between two antenna elements is above 15 dB, which is acceptable within the operating band.

論文審定書 i
誌謝 ii
摘要 iii
Abstract iv
目錄 v
圖次 vii
表次 x
第一章 緒論 1
1.1 研究動機 1
1.2 研究方法 2
1.3 相關文獻概況 2
1.4 論文大綱 3
第二章 MIMO寬槽孔天線設計 4
2.1 寬槽孔天線設計 4
2.2 MIMO天線隔離度設計 8
2.3 實做測量與討論 12
第三章EBG反射板之設計 20
3.1 EBG基本介紹及其應用 20
3.2 單一晶胞的設計 21
3.3 反射板縮小化 24
第四章 天線與反射板之結合與隔離度加強 28
4.1 天線與反射板的結合 28
4.2 不同型態反射板對於天線效能的討論 37
4.3 輻射場型穩定度的探討 40
4.4 實做測量與討論 46
第五章 結論 53
參考文獻 54

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