臺灣博碩士論文加值系統

於設計低通濾波器時，3dB截止頻率、通帶區內之植入損失與折返損失及截止區之衰減斜率等皆為重要之考量依據，而加入諧振電路結構可改善其濾波特性。於本論文中，分別利用加入串聯諧振電路與並聯諧振電路來設計低通濾波器，以期有較佳之濾波特性。
於本論文中，首先探討具諧振電路低通濾波器之設計理論。其次，分別設計及製作具串聯諧振電路與並聯諧振電路之低通濾波器。最後，實際量測兩種具諧振電路低通濾波器之特性，並將量測結果與模擬數值作比較。

In the design of lowpass filter, the 3dB cutoff frequency, the insertion and return losses in the passband, and the attenuation slope in the stopband are important parameters to be considered. Moreover, the performances of filters can be improved if the resonant circuit structures are added. In this thesis, the structures of the series and parallel resonant circuits are added in the design of lowpass filters to achieve the better performances.
In this thesis, the theories of the design of lowpass filters with resonant circuits is analyzed firstly. Next, the lowpass filters with series and parallel resonant circuits are designed and realized, respectively. Finally, the characteristics of the lowpass filters with resonant circuits are measured and compared with the simulation results.

第一章 緒論……………………………..……………............1
1-1 研究動機………………………………………..………….1
1-2 文獻探討………………………………………..………….2
1-3 內容概要…………………………………………….......3
第二章 具諧振電路低通濾波器之理論分析……..…............4
2-1 簡介………………………………………………..……….4
2-2 準TEM傳輸線……………………………………………....4
2-3 集總式濾波器……………………………………………… 7
2-3.1 濾波器種類…………………………………………….....7
2-3.2 設計方法……………………………………………….....8
2-3.3 阻抗與頻率刻度轉換.………………………………..,,,.10
2-4 分散式濾波器……………………………………………...13
2-5 具諧振電路之低通濾波器………………………………...15
2-5.1 具串聯諧振電路…………………………………….......15
2-5.2 具並聯諧振電路…………………………………….......16
2-6 並聯諧振電路之 T - 與 π - 電路互換…………………17
第三章 具諧振電路低通濾波器之設計與模擬……..............32
3-1 簡介………………………………………………………...32
3-2 具串聯諧振電路低通濾波器……………………………...32
3-3 具並聯諧振電路低通濾波器……………………………...36
3-4 電腦輔助模擬……………………………………………...39
3-4.1 具串聯諧振電路…………………………………….......39
3-4.2 具並聯諧振電路…………………………………….......40
第四章 具諧振電路低通濾波器之特性量測………..............52
4-1 簡介………………………………………………………...52
4-2 電路佈局與量測步驟……………………………………...52
4-3 電路特性之量測…………………………………………...53
4-3.1 具串聯諧振電路….…………………………………......53
4-3.2 具並聯諧振電路……………….……………………..... 53
4-4 結果與討論………………………………………………...54
第五章 結論…………………………………………..............67
參考文獻………………………………………………..............69

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