臺灣博碩士論文加值系統

本論文以四分之波長短路殘段帶通濾波器為原型，共提出五種不同的寬頻帶通濾波器，分別為第I型(單步階式阻抗傳輸線)、第II型(雙步階式阻抗傳輸線)、第III型(π型傳輸線)、第IV型(單T型傳輸線)及第V型濾波器(雙T型傳輸線)，利用ABCD網路分析法，將原先四分之波長短路殘段帶通濾波器上的線段替換成上述五種不同的傳輸線。
第I型及第II型濾波器分別為使用單步階式阻抗傳輸線及雙步階式阻抗傳輸線，這兩型傳輸線具有電路尺寸小以及寬截止頻帶的特性，第III型濾波器為使用π型傳輸線，該傳輸線具備了電路尺寸小的特性，第IV型及第V型濾波器分別使用單T型傳輸線以及雙T型傳輸線，而這兩型電路具備了電路尺寸小及寬截止頻帶的特性。
上述這五種電路皆有模擬與實測結果，且皆與模擬與量測的響應圖皆有良好的一致性，因此若要製作電路微小化及寬截止頻帶的帶寬頻帶通濾波器，本篇論文提出的五種傳輸線結構是一個有效且可行的方法。

In this study, we proposed 5 different wideband bandpass filter which are all based on the stub loaded bandpass filter. They are type I (single stepped-impedance transmission line), type II (double stepped-impedance transmission line), type III (π shape transmission line), type IV (single T shape transmission line) and type V (double T shape transmission line). By using ABCD matrix, the transmission line of stub-loaded bandpass filter can be replaced by these 5 types transmission lines.
Type I and type II filter are separately using single stepped impedance lines and double stepped impedance lines. Both of them have advantages such as compactness and wide stopband. Type III filter is using π shape transmission lines, this filter has advantage such as compactness. Type IV and type V are separately using single T transmission lines and double T transmission lines, both of them have the advantages such as compactness and wide stopband.
These five types filters all have simulation and measured results, and a good agreement between simulations and measured results. Hence, if the requirement is wideband, compactness and wide stopband bandpass filter, these five filters are effective and feasible.

第一章、緒論
1.1 研究動機
1.2 文獻回顧
1.3 論文貢獻
1.4 論文架構
第二章、理論分析
2.1 散射係數
2.2 ABCD矩陣分析
2.3 傳統帶通濾波器之設計
第三章、電路設計
3.1 第I型傳輸線(單步階式阻抗傳輸線)
3.1.1 電路設計
3.1.2 電路布局圖與量測
3.2 第II型傳輸線(雙步階式阻抗傳輸線)
3.2.1 電路設計
3.2.2 電路布局圖與量測
3.3 第III型傳輸線(π型傳輸線)
3.3.1 電路設計
3.3.2 電路布局圖和量測
3.4 第IV型傳輸線(單T型傳輸線)
3.4.1 電路設計
3.4.2 電路布局圖和量測
3.5 第V型傳輸線(雙T型傳輸線)
3.5.1 電路設計
3.5.2 電路布局圖和量測
第四章、結論

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