臺灣博碩士論文加值系統

此論文提出「集總-分散式耦合線帶通濾波器」，以達成縮小化、高止帶衰減率、寄生通帶抑制的目標。
論文中的「集總-分散式耦合線帶通濾波器」，乃藉由在傳統耦合線段的末端接上集總式電容或電感性負載，以縮短耦合線段的長度。此外，由於引入了電容性或電感性交互耦合(cross-coupling)的機制，在通帶的兩側可置入傳輸零點(transmission zero)。而傳輸零點的位置，可簡單地藉由改變產生交互耦合的電容或電感的大小去調整。我們也建立了「傳統耦合線段」與「分散-集總式耦合線段」間的簡易等效模型，並將之應用於「縮小化耦合線帶通濾波器」的設計與研究當中。
另外針對濾波器的倍頻響應，本論文也提出了改善的方法，並且不需額外增加其他元件而增加設計上的困難度。

In this study, parallel-coupled bandpass filters based on lumped-distributed coupled-line sections have been proposed to possess the merits of compact size, good selectivity, and good stopband rejection.
Novel parallel-coupled bandpass filters are proposed, by using additional lumped capacitors or inductors to reduce the length of coupled-line sections. In addition, by introducing the capacitive or inductive cross-coupling effect, transmission zeros can be achieved to improve the filter selectivity. The locations of transmission zeros may be simply adjusted by varying the cross-coupling capacitance or inductance. Simple equivalent-circuit models and design formulas are also established, from which the proposed parallel-coupled bandpass filters based on lumped-distributed coupled-line sections may be design and investigated.
Furthermore, the approach to suppress the spurious response is also discussed so as to enhance the stopband characteristics.

第一章 簡介 ••••••••••••••••1
第二章 濾波器之設計理論 ••••••••••7
2-1 前言 ••••••••••••••••••••••7
2-2 集總式濾波器 ••••••••••••••••••8
2-3 分散式濾波器 ••••••••••••••••• 12
2-4 耦合線帶通濾波器 ••••••••••••••• 19
第三章 集總-分散式耦合線帶通濾波器原理•• 33
3-1 前言 ••••••••••••••••••••• 33
3-2 定性分析 ••••••••••••••••••• 34
3-3 定量分析 ••••••••••••••••••• 37
3-4 集總-分散式耦合線段•••••••••••••• 44
3-5 結論 ••••••••••••••••••••• 52
第四章 集總-分散式耦合線帶通濾波器實作•• 65
4-1 前言 ••••••••••••••••••••• 65
4-2 集總-分散式耦合線帶通濾波器 ••••••••••66
4-3 倍頻抑制電路的設計•••••••••••••••77
4-4 結論 ••••••••••••••••••••• 80
第五章 結論••••••••••••••••99
參考文獻••••••••••••••••• 102

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