臺灣博碩士論文加值系統

本論文針對數位電視中的DVB系統提出數種創新的天線設計。首先我們提出平面衣袖式偶極天線，藉著由偶極天線負訊號端往正訊號端延伸出適當長度的兩條衣袖金屬線，能夠使天線在相當寬的頻率範圍內具有良好的阻抗匹配。接著利用蜿蜒微帶金屬線與耦合殘段，設計具有縮小化效果的新型天線，在適當調整耦合殘段的長度及寬度後，我們可以改善蜿蜒結構的高感抗特性，達到數位電視頻寬的要求。最後我們參考L形匹配電路的概念，設計出包含匹配網路的天線設計。以上提出的三種天線設計皆可得到完整涵聞VB系統所需頻寬(470MHz~862MHz)要求。

Novel designs of modified antennas for DTV (Digital TV) system application are proposed in this thesis. First, planar sleeve antennas with a pair of strips for wideband operations are investigated. In this study, it’s found that a modified dipole antenna can effectively improve antenna bandwidth for achieving DTV system application. Second, compact meandered dipole antennas with coupling stubs are also investigated. By adjusting length and width of coupling stubs, a meandered dipole antenna visibly improve antenna bandwidth and achieve DTV system requirement. Finally, we propose modified monopole antennas with matching network for DTV operation (470MHz~862MHz).

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 適用於數位電視訊號接收之衣袖式偶極天線設計
(Sleeve Dipole Antenna for DTV Operation) …………………….………….6
2.1 概述……………………………………………………………………....6
2.2 天線設計…………..……………………………………………………..7
2.3 實驗結果與分析…………………..………………..………………..…11
2.3.1衣袖金屬線長度Ls的影響………..…...……….…………….…..11
2.3.2衣袖結構金屬線寬度Ws的影響………..………………………15
2.3.3中心微帶金屬線寬度Wc的影響………..………………………17
2.4 適用於數位電視訊號接收之衣袖式偶極天線最佳設計參數……..…19
2.5 心得討論…………….……..……………………………..………….…24
第三章 適用於數位電視訊號接收之縮小化偶極天線設計
(Compact Dipole Antenna for DTV Operation)………………….………… 25
3.1 概述…………………………..…………………………………………25
3.2 天線設計……………..……………………………....…………………25
3.3 實驗結果與分析…………………………………………………..……27
3.3.1 耦合微帶殘段長度Lc的影響…………………………………..…27
3.3.2 穿插耦合殘段A ~ F的影響………..……………………….…..…31
3.3.3 調整殘段D長度的影響…………..………………………...…..…37
3.3.4 改變耦合殘段A至耦合殘段C寬度的影響………………………40
3.4 適用於數位電視訊號接收之偶極天線縮小最佳設計參數………......42
3.5 心得討論…………………………………………………………....…..47
第四章 包含匹配網路之數位電視單極天線設計
(Monopole Antenna with Matching Network for DTV Operation)………....48
4.1 概述………………………………………………………………..……48
4.2 天線設計……………..……………………………....…………………48
4.3 實驗結果與分析…………………………………………………..……50
4.3.1 改變A點到B點的蜿蜒金屬線長度的影響…………….…...……50
4.3.2 串聯不同的電容值的影響…………………………..……………53
4.4 數位電視頻段之單極天線最佳設計參數……………….……...……..56
4.5 包含匹配網路之數位電視單極天線設計之縮小化…….………...…..61
4.6 心得討論………………………………………………………………..69
第五章 結論(Conclusions)………………………………………………….70
參考文獻 (References)………………………………………………..…….71

[1] 工研院經資中心, http://www.iek.itri.org.tw/Home/Home.aspx
[2] http://www.fcc.gov/cgb/consumerfacts/digitaltv.html
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