在本論文中，我們利用單負超穎材料的概念，設計行動裝置中降低MIMO天線彼此耦合的隔離機制。一開始我們利用多層週期性結構排列的方式來提升隔離器的頻寬，頻寬可利用調整每個超穎材料共振長度及多層陣元排列來提升，然後整合所設計的隔離器於一平面天線上，可以使天線的隔離度提升至-20dB 以上，量測及模擬頻寬值分別為8%及6.9%。接著我們針對MIMO 天線應用於多
頻帶操作的需求，提出一種可以使用在雙頻的隔離器設計。藉著堆疊兩層操作在不同頻率的隔離器，可同時提升雙頻天線在兩個頻段下的隔離度至-20dB 以上。
接著我們針對寬頻的應用層面設計一具有寬頻特性的隔離器，在兩天線仍保持0.18 波長的間距中，加入一T 型接地結構，使隔離頻寬在量測值中相較於原先多層結構有將近12.8%的提升，達到20.8%，所設計的寬頻隔離器可使用於現今多種應用MIMO 系統的通信標準。

In the thesis, we use the concept of single-negative metamaterials to reduce the antennas’ coupling. Firstly, the multilayer insulator is proposed to enhance the isolation bandwidth. The isolation bandwidth is broadened by adjusting the individual layer of insulators with close but different operating frequencies. Then, the designed multilayer insulator is inserted in a planar antenna system. Isolation of the MIMO antenna system is below than -20dB. The measured and simulated isolation bandwidth is 8% and 6.9%, respectively. We then design dual-band insulators for dual-band MIMO antenna applications. The proposed dual-band insulator is implemented bystacking the insulators with different operating bands and the isolation of the dual-band MIMO antenna can be improved at both 2.6 and 3.5GHz bands.
In the broadband insulator design, the T-shaped branch is proposed to broadenthe operating bandwidth. The measured isolation bandwidth is improved by 12.8% than that of the multilayer insulator. The bandwidth of the proposed broadband
insulator can be used in other broadband communication standards.

致謝 I
摘要(中文) III
摘要(英文) IV
目錄 V
圖表目錄 VI

第一章 序論(Introduction) 1
1-1 多輸入多輸出通訊架構 1
1-2 超穎材料簡介 2
1-3 相關研究概況 6
1-4 研究方法 10
1-5 論文大綱 10
第二章 評估週期性結構的諧振頻率(Evaluate Operating Frequencies of Finite-sized Periodic Structures) 12
2-1 天線接收實驗架構 12
2-2 有限數目的陣元對操作頻率的影響 16
2-2-1 PEC-PMC波導管的高度與共振頻率的關係 17
2-2-2 改變縱向(X軸)單元使用個數對共振頻率的影響 18
2-2-3 天線與單負材料擺放距離的影響 19
第三章 MIMO天線與多層周期性結構結合 (MIMO Antenna combined with Multilayer Structures) 20
3-1單一單負單元設計 20
3-2 MIMO天線基本設計 24
3-3結合多層結構的MIMO天線與比較 26
3-4 Ω-型高隔離度排列設計 28
3-5實作與討論 30
第四章 雙頻MIMO天線隔離設計(Dual-band MIMO Antenna Isolation Design) 33
4-1 雙頻MIMO天線設計 33
4-2 雙頻超穎材料設計概念 34
4-3實作及量測 38
第五章 寬頻MIMO天線隔離設計(Broadband MIMO Antenna Isolation Design) 42
5-1 天線近場對超穎材料陣元影響 42
5-2 L-型接地結構概念 43
5-3 MIMO天線結合H-型隔離器及T型接地結構 46
5-4實作與討論 48
第六章 結論(Conclusion) 53
參考文獻 55

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