本論文為針對現今所熱門的數位電視，在行動通訊裝置應用上，所提出的三款天線的設計，不僅頻寬都符合數位電視所需之要求，且設計皆為平面式的結構，不論在製作成本的降低及攜帶性上，都有其實用與便利性。在雙支路天線的設計中，主要是由兩輻射金屬片所共振出的高低頻，再配合彼此末端耦合的技術，形成一寬頻模態；耦合式寬頻偶極天線則是以一長條形的耦合部當成饋入方式，搭配兩片金屬所形成的偶極天線，可使全波長模態有效被激發，結合原先之半波長模態以包含所需之頻帶；最後的設計我們提出了另一款的V字形偶極天線，藉由在饋入點附近挖置一槽縫的方式，激發全波長模態，與半波模態合成一頻寬百分比超過50%的模態，並由於其V字形的結構，可降低數位電視訊號在接收時的死角。

The study in this thesis focuses on the DTV antennas for mobile applications. By using the novel techniques in the proposed antenna, the narrow-band problem and the radiation pattern of the conventional DTV antenna can be improved. In the first design, the antenna comprises two radiating arms. By adjusting the open gap between the ends of the two radiating arms, large impedance bandwidth can be obtained for DTV signal reception. In the second design, by integrating a coupling portion into the dipole antenna, the full-wavelength resonant mode can be excited successfully and combined with the half-wavelength mode to form a wide operating band. Finally, in the third design, a U-shaped feeding gap is embedded within the V-shaped antenna to excite the full-wavelength resonant mode. Additionally, the dipole antenna can radiate comparable EΦ and Eθ components, resulting in no nulls in the total-power radiation patterns in the horizontal and vertical planes.

文字目錄 i

圖形目錄 iii

表格目錄 v

第一章 序論 (Introduction) 1
1.1 研究動機 1
1.2 文獻導覽 2
1.3 論文提要 4

第二章 雙支路單極數位電視天線設計 (Two-Branch Monopole Antenna for DTV Reception) 5
2.1 天線設計與技術原理 6
2.2 實驗結果與相關參數分析 9
2.3 心得與討論 14

第三章 耦合式寬頻偶極數位電視天線設計 (Coupled-Fed Broadband Dipole Antenna for DTV Reception) 15
3.1 天線設計與技術原理 16
3.2 實驗結果與相關參數分析 18
3.3 實際測試結果分析 22
3.4 心得與討論 24

第四章 寬頻V形偶極數位電視天線設計 (Broadband V-Shaped Dipole Antenna for DTV Reception) 25
4.1 天線設計與技術原理 26
4.2 實驗結果與相關參數分析 29
4.3 實際測試結果分析 35
4.4 心得與討論 36

第五章 結論 (Conclusion) 37

參考文獻 (References) 39

論文著作表 (Publication List) 42


圖形目錄

圖2.1 本天線之(a)結構平面圖與(b)輻射部表示圖 7
圖2.2 本天線於產品上之(a)實際使用情形圖與(b)未使用情形圖 8
圖2.3 本天線量測與模擬之返回損失比較圖 9
圖2.4 本天線分別單獨只有輻射金屬片與寄生金屬片時之返回損失比較圖 10
圖2.5 變化輻射金屬片與寄生金屬片末端所形成之間距G之返回損失比較圖 10
圖2.6 變動寄生金屬片之末端K之返回損失圖 11
圖2.7 變動輻射金屬片末端T之返回損失圖 11
圖2.8 變動輻射金屬片中間折彎處寬度R之返回損失比較圖 12
圖2.9 本天線操作於510 MHz時之遠場輻射場型圖(模擬值) 13
圖2.10 本天線操作於750 MHz時之遠場輻射場型圖(模擬值) 13
圖2.11 本天線之增益與輻射效率圖(模擬值) 14
圖3.1 本天線結構之(a)正面上視圖與(b)背面上視圖 16
圖3.2 本天線量測與模擬之返回損失比較圖 17
圖3.3 本天線與傳統偶極天線之返回損失比較圖 18
圖3.4 變動本天線總長度L之返回損失比較圖 19
圖3.5 變動本天線耦合部之長度S之返回損失比較圖 20
圖3.6 本天線分別操作於(a)500 MHz與(b)800 MHz時之表面電流分佈圖 20
圖3.7 本天線操作於500 MHz時之遠場輻射場型圖(模擬值) 21
圖3.8 本天線操作於800 MHz時之遠場輻射場型圖(模擬值) 21
圖3.9 本天線之增益與輻射效率圖(模擬值) 22
圖3.10 本天線實際量測時之使用情形圖 23
圖3.11 本天線實際量測時之接收畫面圖 23
圖4.1 本天線之物理結構平面圖 27
圖4.2 本天線量測與模擬之返回損失比較圖 28
圖4.3 本天線變動strip c之長度L時之返回損失比較圖 30
圖4.4 本天線變動strip c之寬度W時之返回損失比較圖 30
圖4.5 本天線分別操作於(a)550 MHz與(b)700 MHz時之表面電流分佈圖 32
圖4.6 本天線操作於550 MHz時之二維遠場輻射場型圖(模擬值) 33
圖4.7 本天線操作於750 MHz時之二維遠場輻射場型圖(模擬值) 33
圖4.8 本天線分別操作於(a)550 MHz與(b)700 MHz時之三維遠場輻射場型圖(模擬值) 34
圖4.9 本天線之增益與輻射效率圖(模擬值) 34
圖4.10 本天線實際量測時之使用情形圖 35
圖4.11 本天線實際量測時之接收畫面圖 36

表格目錄
表3.1 本天線實際量測各頻率點所得之訊號品質與訊號強度 23
表4.1 本天線實際量測各頻率點所得之訊號品質與訊號強度 35

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