現代無線通信系統對於高數據傳輸速率和通道容量的需求，依舊是系統發展與研究創新的主要重點。這些技術中，MIMO天線是被用來實現上述目標和增加傳輸路徑的主要方法。而MIMO天線設計的主要挑戰是要求在一個小尺寸且外型低矮的無線通信設備中使用，其中特別是由於天線元件的有限間距造成的相互耦合問題。要如何降低這些天線元件間的互耦影響，以提高多天線傳輸特性，成為現代無線通信系統設計的一個重要議題。
本文提出了一些MIMO天線設計的創新和發展的研究課題。首先，文中提出所設計之三組不同的全金屬MIMO天線，藉由良好的性能與結構，使它可以很容易地與其它電子元件結合，而不會影響彼此特性，尤其適合車輛或機械人系統應用。接著，提出了一種新穎的結構，它是一種微帶印刷天線，稱為PIFA-like，它近似中和線（Neutralization Line, NL），但是性質卻不相同。此種PIFA-like天線可以提供優異的MIMO性能，但不需要額外的元件或空間來改善隔離度，並能使天線尺寸小型化。最後，我們探索電波暗室和微波混響室之間的差異，透過實際測量兩種不同結構的PIFA-like MIMO天線，並比較兩種天線的輻射效率和通道容量的實驗值，希望能提供相類似天線的發展經驗。現今無線通訊已經準備進入5G時代，而MIMO天線仍是主要需求技術，所以希望這一連串的實驗和創作，能夠帶來新的思路和解決方案，以有助於新的通信技術快速發展。

The demand for high data rates and channel capacity is always the primary pursuit in modern wireless communication systems. In the pursuit, MIMO antennas are used to achieve the goal by accommodating multiple data streams. The main challenge of MIMO antenna design is to fit the antenna in a small and low-profile wireless communication device, and at the same time to reduce the mutual coupling between the antenna elements. The mutual coupling is due to the closely spaced antenna elements.
This dissertation presents several novel MIMO antenna systems. First, three full-metal MIMO antennas were designed with good performance. The full-metal MIMO antennas can be easily combined with other electronic components without being affected; especially when they are used in vehicular or robotic applications. Next, a novel MIMO antenna based on single-body PIFA-like is proposed. The structure looks like a neutralization line (NL), but in reality it is fundamentally different from a NL. The PIFA-like antenna can provide high isolation, but do not need additional elements or space to achieve the goal. Finally, we explore measurement differences between the anechoic chamber and reverberation chamber by measuring two reference MIMO antennas of PIFA-like configurations. Specifically, antenna radiation efficiency and channel capacity of these two reference designs were obtained. MIMO antenna technology is one of key technologies that can be used to fulfill the goals of 5G. Hopefully, this study contributes to better MIMO antenna design.

目錄
論文審定書 i
Acknowledgements iii
摘要 v
Abstract vi
Contents vii
List of figures ix
List of tables xiv
Chapter 1 Introduction 1
1.1 Motivation and scope of dissertation 1
1.2 Research methods 5
1.3 Contributions and outline of dissertation 7
Chapter 2 MIMO antenna design theory and methods 10
2.1 MIMO antenna characteristics 11
2.2 Methods for improved isolation 22
2.3 Co-radiator structure design 35
2.4 Discussion 39
Chapter 3 Full metal MIMO antenna design 41
3.1 A concurrent dual-band six antenna system for MIMO access points applications 43
3.2 A high port isolation access point MIMO system using a triangular located hexahedron 49
3.3 A high port isolation MIMO antenna system for 2-6 GHz wide-band AP applications 57
3.4 Discussion 62
Chapter 4 Low-profile PIFA-like MIMO antennas design 66
4.1 Case-1: A π-shaped PIFA-like MIMO antenna with built-in isolation 67
4.2 Case-2: A polarization diversity MIMO antenna system for 2.4/5 GHz dual-bands access point applications 86
4.3 Discussion 97
Chapter 5 Evaluation of radiation performance of various PIFA-like MIMO antennas 103
5.1 Measurements of MIMO antenna 104
5.2 Reference antennas 114
5.3 Comparison of different measurement results 117
5.4 Discussion 119
Chapter 6 Conclusion and future work 121
6.1 Conclusion- major contributions 121
6.2 Future work 124
Reference 127
Publications 144

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