臺灣博碩士論文加值系統

在本論文中，依據行動通訊系統發展趨勢，提出了適用於手持式行動通訊設備之天線設計。主要架構為印刷式平面型天線，其優點製作容易、價錢低廉、低姿態，採用50Ω同軸線饋入之單極天線，利用多路徑或雙路徑使單極天線具多頻段的效果。另外提出了另一設計結構上於系統接地面蝕刻截角，由於截角架構能使輻射金屬面與系統接地面之電磁耦合量降低，改善其阻抗頻寬的趨勢，使得設計上高低頻頻率比約2.04:1，達到手機操作頻段需求。

According to develop the trends of the mobile system, the antenna designs for broadband operation have been proposed. The principal constructions are the printed plane antennas, the advantages are made easy, low cost, low-profile. Utilizing the multiple current paths or dual current paths in these antennas by 50Ω of the coaxial feed to reach the multi-band. In addition, this notch can alter the electromagnetic coupling effects between the monopole and the ground plane, and improves impedance bandwidth to make the frequency ratio around 2.04:1. To reach GSM/PCS/DCS/UMTS operation band.

第一章 序論 (Introduction) 1
1.1 概述 1
1.2 文獻導覽 3
1.3 論文提要 4
第二章 手持式單極天線設計
(Monopole Antenna For Handset Operation) 5
2.1 概述 5
2.2天線設計 5
2.3 實驗結果與分析 9
2.4天線設計場型與增益探討 19
2.5結論與心得 24
第三章 四頻單極天線設計
(Quad-Band Monopole Antenna Design) 25
3.1 概述 25
3.2天線設計 25
3.3 實驗結果與分析 29
3.4天線場型與增益探討 36
3.5結論與心得 40
第四章 結論 (Conclusions) 41
參考文獻 (References) 42

表格目錄
Table 1. 為本章天線設計改變截角長度Ln影響頻率比相關參數模擬測量表 16
圖形目錄
圖2-1 手持式單極天線正面整體結構圖 7
圖2-2手持式單極天線結構圖 8
圖2-3 本章天線設計之實驗量測與模擬返回損失圖 9
圖2-4 手持式單極天線之只存在線狀輻射金屬面或片型寄生金屬面之模擬返回損失圖 10
圖2-5 本章天線設計之加入式寄生金屬片之模擬(a)返回損失比較圖與(b)輸入阻抗圖 11
圖2-6本章天線設計之寄生金屬片長度La變化之模擬(a)返回損失圖與(b)史密斯圖 12
圖2-7 手持式單極天線接地面截角設計整體結構圖 13
圖2-8 本章天線設計調整截角面積之長度Ln之模擬返回損失比較圖 14
圖2-9 本章天線設計之調整截角面積長度Ln之模擬(a)實部阻抗圖與(b)虛部阻抗圖 15
圖2-10 本章天線設計之調整截角寬度Wn之模擬返回損失比較圖 17
圖2-11 本章天線設計之調整截角寬度Wn之模擬(a)實部阻抗圖與(b)虛部阻抗圖 18
圖2-12本章天線設計於900MHz之(a)二維量測遠場輻射場型；(b)三維SEMCAD模擬遠場輻射場型 20
圖2-13本章天線設計於1850MHz之(a)二維量測遠場輻射場型；(b)三維SEMCAD模擬遠場輻射場型 21
圖2-14本章天線設計於1950MHz之(a)二維量測遠場輻射場型；(b)三維SEMCAD模擬遠場輻射場型 22
圖2-15本章天線設計於2150MHz之(a)二維量測遠場輻射場型；(b)三維SEMCAD模擬遠場輻射場型 23
圖2-16 本章天線設計在DCS/PCS/UMTS操作頻帶內之量測最大天線增益與模擬軟體SEMCAD輻射效率圖 24
圖3-1 本章四頻手持式單極天線正面結構失圖 26
圖3-2 本章天線平面結構圖之詳細尺寸 27
圖3-3本章天線設計之實驗量測與模擬返回損失圖 28
圖3-4 本章天線設計之有無狹縫比較模擬返回損失圖 29
圖3-5 本章天線設計狹縫寬度Ws長度變化之模擬返回損失圖 30
圖3-6 本章天線設計有無寄生短路棒之模擬返回損失圖 31
圖3-7 本章天線設計寄生短路棒長度S1變化之模擬返回損失圖 32
圖3-8 本章四頻手持式單極天線於截角設計背面結構 33
圖3-9 本章天線設計之改變蝕刻長度Ln之模擬返回損失圖 34
圖3-10本章天線設計之改變蝕刻長度Ln之(a)實部阻抗圖；(b)虛部阻抗圖 35
圖3-11本章天線設計於900MHz之(a)二維量測遠場輻射場型；(b)三維SEMCAD模擬遠場輻射場型 37
圖3-12本章天線設計於1800MHz之(a)二維量測遠場輻射場型；(b)三維SEMCAD模擬遠場輻射場型 38
圖3-13本章天線設計於1900MHz之(a)二維量測遠場輻射場型；(b)三維SEMCAD模擬遠場輻射場型 39
圖3-14 本章天線設計在DCS/PCS操作頻帶內之量測最大天線增益與模擬軟體SEMCAD輻射效率圖 39

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