在未來的5G通訊系統當中，大規模MIMO天線系統為可能應用的技術之一。而在MIMO天線系統之中，當智慧型手機及基地台之天線數目同時增加時，可以達成更高的通道容量，因此本論文提出一應用於8 x 8 LTE MIMO系統之手機八天線陣列設計，可涵蓋LTE 3500 MHz (3400~3600 MHz)的使用頻帶，該頻帶為WRC-15制定於未來行動通訊系統使用的全球通用頻帶。八天線陣列是由分別配置於手機系統接地面兩長側邊的兩組四天線陣列所構成，四天線陣列的總長度為60 mm且僅有1 mm的寬度，可適用於大螢幕尺寸的智慧型手機。八天線的天線效率均大於45%且天線之間的ECC也均小於0.1，將八天線陣列應用於8 x 8 MIMO系統時，在SNR為20 dB的條件下，可計算出其通道容量約能達到37 bps/Hz。此外，在OTA (over-the-air)的測試環境下，藉由LTE MIMO天線量測系統能夠驗證理論計算與量測結果，並且分析使用者手握以及不同量測距離對於八天線陣列MIMO效能的影響。

The Massive MIMO system is one of promising techniques for the fifth-generation (5G) communications in the future. For the Massive MIMO system, increasing both the numbers of the antennas in the smartphone and base station can lead to higher channel capacity. An eight-antenna array for the 8 x 8 LTE MIMO system in the smartphone is hence presented to increase the channel capacity. The antenna array can cover the 3500 MHz LTE band (3400~3600 MHz), which is a global mobile broadband recently identified by WRC-15 for mobile communication system in the future. The eight-antenna array is formed by two quad-antenna arrays disposed along two long side edges of the system ground plane in the smartphone. The length and width of a quad-antenna array is respectively 60 mm and 1 mm only, which is suitable for application in the smartphone with a large display panel. The antenna efficiency of the eight antennas is better than 45% and the ECC is less than 0.1 between any two antennas thereof. The channel capacity of the eight-antenna array can reach about 37 bps/Hz for the 8 x 8 LTE MIMO system at 20-dB signal-to-noise (SNR). The measured data from the LTE MIMO measurement system in the OTA (over-the-air) testing verify the calculated results. Effects of the user’s hand and different measurement distances on the MIMO performance are also analyzed.

論文審定書 i
致謝 ii
中文摘要 iii
英文摘要 iv
目錄 v
圖次 vi
表次 vii
第一章 序論 (Introduction) 1
1.1 研究動機 1
1.2 文獻導覽 3
1.3 論文提要 4
第二章 智慧型手機之LTE MIMO八天線陣列設計 (Eight-Antenna Array in the Smartphone for the LTE MIMO Operation) 7
2.1 八天線陣列結構與技術原理說明 7
2.2 八天線陣列實驗與量測結果探討 13
2.3 MIMO天線系統之通道容量計算方式與結果說明 19
2.4 心得與討論 26
第三章 LTE MIMO天線量測系統 (LTE MIMO Antennas Measurement System) 29
3.1 MIMO天線量測系統說明 29
3.2 手機八天線MIMO量測結果分析 36
3.3 心得與討論 43
第四章 結論 (Conclusions) 45
參考文獻 (References) 48
著作表 (Publication List) 52

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