本論文提出適用於金屬邊框平板電腦裝置之低姿勢開槽孔天線設計，其可涵蓋LTE之操作頻寬。第一項設計為使用主動式切換開關的低姿勢LTE雙饋入開槽孔天線，其天線高度僅為5 mm，在等效切換開關的簡化結構下，低頻饋入激發倒L形槽孔的0.25λ槽孔共振模態於低頻頻帶，而高頻饋入時饋入微帶線形同一虛短路，可以激發其饋入端至開口端的0.25λ槽孔模態以及饋入端至閉口端的0.5λ槽孔模態於高頻頻帶，再經由低高頻饋入端分別加入一組匹配電路增加其頻寬來達成雙寬頻操作。第二項設計提出一種LTE雙寬頻的U形開槽孔天線設計，其天線高度僅為6 mm，U形槽孔本身能激發0.5λ以及1.0λ槽孔模態來涵蓋高頻寬頻頻帶，並透過在U形槽孔路徑中加入一倒U形線段連接來產生低頻共振路徑，其可產生0.25λ槽孔模態於低頻頻帶，接著搭配高通匹配電路的使用來涵蓋低頻寬頻頻帶，以達成LTE雙寬頻操作。

In this thesis, low-profile open-slot antennas applied to cover the LTE operation in the metal-framed tablet device are presented. The first antenna design is a low-profile (5 mm) LTE dual-feed open-slot antenna with active switches. In this design, the active switches are simplified as a conducting strip for the ON-state and an open circuit for the OFF-state. In the lower band, the inverted-L open slot is excited to generate the fundamental resonant mode by the first feed. In the higher band, the antenna is excited by the second feed to generate the 0.25-wavelength slot resonant mode created by the open-slot radiator formed between the slot opening and the microstrip feedline as a virtual shorting and the 0.5-wavelength slot resonant mode by the closed-slot radiator formed between the slot end and the microstrip feedline as a virtual shorting. By further adding wideband matching circuits in the first and second feeds, the antenna can achieve two wideband operations to cover the LTE bands. The second design is a U-shape open-slot (U-slot) antenna with a low profile of 6 mm for the LTE operation. The antenna can generate 0.5-wavelength and 1.0-wavelength slot resonant modes to cover the desired higher band. By using an inverted-U strip connecting across the U-slot, the antenna can create an additional open-slot radiator to generate a 0.25-wavelength slot resonant mode at lower frequencies. The desired lower wideband is then achieved by the antenna using a high-pass matching circuit.

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 2
1.3 論文提要 2
第二章 使用主動式切換開關之低姿勢LTE雙饋入開槽孔天線設計 (Low-Profile LTE Dual-Feed Open-Slot Antenna with Active Switches)
2.1 天線結構介紹與技術原理說明 6
2.2 模擬結果與分析 11
2.3 心得與討論 15
第三章 LTE雙寬頻之低姿勢U形開槽孔天線設計 (Low-Profile LTE Dual-Wideband U-Shape Open-Slot Antenna)
3.1 天線結構介紹與技術原理說明 17
3.2 實驗結果與參數分析 26
3.3 延伸設計 34
3.4 心得與討論 37
第四章 結論 (Conclusions) 39
參考文獻 (References) 41
論文著作表 (Publication List) 44

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