本論文提出一整合5G頻帶的LTE MIMO三天線設計，天線淨空區僅為0.8 mm，可應用於高螢佔比的智慧型手機，並在不額外增加天線數量的情況下，同時涵蓋4G LTE以及5G頻帶。天線一、天線二、天線三分別位於手機上方短邊框的中、左、右，天線二的結構為單極結合邊框上的寄生單極，邊框內側並聯分布式電容使寄生單極天線高階模態降頻，並增加支路增加高頻頻寬，將5G頻帶整合入原先的天線中，共涵蓋GPS 1500~1600 MHz、LTE中、高頻1710~2700 MHz、5G頻帶3300~4200 MHz。天線三與天線二結構與機制相似，涵蓋LTE中、高頻1710~2700 MHz及5G頻帶3300~4200 MHz。接著於天線二與天線三之間，設計一寄生單極天線結構，可引導天線二與天線三之間的接地面表面電流，改善隔離度。天線一利用此導引電流的結構作為耦合饋入IFA天線的輻射部，並在饋入部加入帶通匹配電路，可涵蓋LTE低頻880~960 MHz。天線一中的另一個饋入部，本身為IFA天線架構，基頻位於5G頻帶，並能寄生激發低頻路徑的高階模態，使天線一同時涵蓋LTE低頻及5G頻帶3300~4200 MHz。三天線共可操作在GPS、LTE低頻、LTE中、高頻 MIMO雙天線及5G頻帶MIMO三天線。上述提出之LTE MIMO三天線設計的詳細結構、技術原理及實作結果和分析將在本論文中說明。

The design of fourth-generation (4G) long-term evolution (LTE) multiple-input multiple-output (MIMO) antennas integrated with fifth-generation (5G) band for the 5G smartphone is presented. The antennas can be applied in high screen-to-body ratio phones with 0.8-mm wide ground clearance and can cover 4G LTE and 5G bands at the same time. There are three antennas at the top edge of the smartphone. From the left to the right are Ant2, Ant1 and Ant3. Ant2 operates in 1500~2700/3300~4200 MHz. It consists of a parasitic monopole antenna on-frame with a parallel distributed capacitor connected to the front plane, a parasitic monopole strip antenna, and a driven monopole strip antenna with a feed network. The distributed capacitor can shift the higher-order resonance modes of the parasitic monopole on-frame antenna to the 5G band in 3300~4200 MHz. The structure of Ant3 is similar to that of Ant2, but Ant3 operates in 1710~2700/3300~4200 MHz. The decoupling between Ant2 and Ant3 is achieved using the on-frame radiator of Ant1 as a decoupling structure. Besides, Ant1 consists of two inverted-F antennas: the first one with a band-pass matching circuit for LTE LB operation and the second one for 5G band operation. Ant1, Ant2 and Ant3 together can provide one Global Positioning System (GPS), one LTE LB, two LTE middle/high bands (M/HB) and three 5G bands. Details of the antenna structures and operating principle of Ant1, Ant2 and Ant3 are described. In addition, the simulated and measured results of the antennas are analyzed and discussed.

目錄
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
第一章 序論 (Introduction)
1.1研究動機 1
1.2文獻導覽 3
1.3論文提要 3
第二章 整合5G頻帶之LTE M/HB MIMO雙天線設計 (LTE M/HB MIMO Antennas Integrated with 5G Band for the 5G Smartphone)
2.1 LTE中、高頻天線結構與技術原理說明 6
2.2 5G頻帶天線技術原理說明 14
2.3延伸設計 22
2.4心得與討論 24
第三章 整合5G頻帶之LTE LB及M/HB MIMO 三天線設計 (LTE LB and M/HB MIMO Antennas Integrated with 5G Band for the 5G Smartphone)
3.1整合5G頻帶之LTE低頻天線結構介紹與技術原理說明 26
3.2實驗結果與分析 34
3.3心得與討論 42
第四章 結論 (Conclusions) 44
參考文獻 (References) 46

參 考 文 獻
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