臺灣博碩士論文加值系統

摘要
本論文提出應用FR4 電路基板微帶線製作交指型集總電容補償 (lump compensation) 來改善平行耦合帶通濾波器之二次諧波 ( spurious )，文中以微帶線製作極小電容值0.046 pf，來改善偶波模態與奇波模態相速度不匹配的缺點，以達到抑制帶通濾波器第二諧波通帶的效果。另外，結合了背板挖地架構(Defected Ground Structure DGS) 的方法，進一步抑制三次 至五次 諧波通帶。根據上述，實作中心頻率2.45 GHz頻寬300 MHz的帶通濾波器，經由模擬與量測的結果證實，本論文所提出的帶通濾波器比傳統平行耦合帶通濾波器有40 dB更好的截止區衰減，且 Stopband 達至12 GHz。

ABSTRACT
The discourse proposed using the interdigital lump compensation manufactured by the FR4 circuit board Microstrip Line to ameliorate thr 2f0 of Parallel Coupled Bandpass Filters. We used Microstrip Line to manufacture minimum capacitor 0.046 pf to improve the match of even mode and odd mode achieving the suppressing parallel coupled passband filter of spurious.
In addition, we suppress the 3 f0 to 5 f0 spurious passband with the Defected Ground Structur (DGS). According to above, the passband filter of this discourse has the better stopband attenuation, and the Stopband reaches to 12 GHz after simulating and measure.

中文摘要………………………………………………………………… i
英文摘要……………………………………………………………… ii
目錄………………………………………………………………… iii
圖目錄………………………………………………………………… v
表目錄………………………………………………………………… viii
第一章 緒言………………………………………………………… 1
1.1 研究動機………………………………………………… 1
1.2 文獻探討……………………………………………… 3
第二章 平行偶合帶通濾波器之特性分析………………………… 7
2.1 耦合線原理……………………………………………… 7
2.2 奇模與耦模特性…………………………………………… 8
2.3 平行耦合微帶線之分析………………………………… 11
第三章 電容補償于耦合微帶線之原理…………………………… 19
3.1 平行帶通濾波器端末加微帶線集總容………………… 19
3.2 集總電容等效電路……………………………………… 20
3.3 集總電容公式計算……………………………………… 22
3.4 間隙類似一平行電容板………………………………… 22
3.5 微帶線間隙等效電容………………………………… 23
3.6 間隙形式可依信號及能量耦合強度分類……………… 24
第四章 背板挖地架構DGS………………………………………… 30
4.1 簡介……………………………………………………… 30
4.2 背板挖地架構DGS之原理……………………………… 31
4.3 背板挖地架構DGS之特性……………………………… 34
4.4 應用DGS設計低通濾波器之製作與測量……………… 38
4.5 結論……………………………………………………… 44
第五章 應用交指型微帶線與DGS製作2.4 GHz寬抑止頻帶BPF…46
5.1 平行偶合帶通濾波器的缺點與改良…………………… 46
5.2 平行偶合帶通濾波器的設計理論……………………… 47
5.3 模擬與量測的結果……………………………………… 49
5.4 改良平行偶合帶通濾波器後的成效…………………… 51
第六章 結論………………………………………………………… 58
參考文獻……………………………………………………………

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