臺灣博碩士論文加值系統

本篇論文主要分成了兩個部份，第一個部分是第三章節的零點可決定之帶通濾波器，採用傳統二階平行耦合線為基礎的帶通濾波器，在這基礎上加入了單端短路耦合線，讓其具有通帶外的一對對稱傳輸零點，並在電磁模擬中加入了開路傳輸線，使其能夠具有諧波抑制的效果。
第二部分是第四章節的小型化寬截止頻帶帶通濾波器，此章節介紹由傳統二階平行耦合線出發，將中間的耦合線更換為對稱雙端短路耦合線使整體電路尺寸縮小，並同時具有諧波抑制之功能，接著在電路加入開路耦合線，利用輸入埠和輸出埠耦合產生在通帶附近的傳輸零點，具有提高電路的選擇性和諧波抑制的效果。為了達到寬截止頻帶的效果，最後再加入開路傳輸線的特性將高次諧波推移至更高的頻率。

The main propose of this thesis divided into two parts. The first part is the bandpass filter with decidable transmission zeros in the third chapter. Based on the traditional second-order parallel coupled lines, we add the single-ended short-circuited coupled lines to generate a pair of transmission zeros on both sides of the passband, and the quarter-wavelength open transmiossion lines are used to improve harmonic suppression.

The second part is miniaturized wide stopband bandpass filter, starts from parallel coupled lines, we change the middle coupled line to symmetric short-circuit coupled line to reduce the size and harmonic suppression. Then add an open coupling line to generate a transmission zeros near the passband and harmonic suppression. Finally add open transmission lines to achieve wide stopband.

目錄
摘要 I
Abstract II
目錄 III
圖目錄 V
表目錄 VII
第一章 緒論 1
1-1 研究動機 1
1-2 文獻探討 2
1-3 論文架構 2
第二章 濾波器設計理論 3
2-1 傳輸參數矩陣(ABCD Matrix) 3
2-2 介入損耗法 6
2-2-1 巴特沃茲濾波器 7
2-2-2 柴比雪夫濾波器 7
2-2-3 低通濾波器雛形 8
2-3 導納及阻抗反轉子(J- and K-inverters) 10
2-4 平行耦合線帶通濾波器介紹 16
2-5 耦合線等效電路 17
2-6 測試夾具量測介紹 20
第三章 零點可決定之帶通濾波器 22
3-1 簡介 22
3-2 理論分析 22
3-2-1 耦合係數法合成平行耦合線帶通濾波器 22
3-2-2 分析零點產生機制 24
3-2-3 開路傳輸線形成諧波抑制 28
3-3 設計實例 34
第四章 小型化寬截止頻帶帶通濾波器 36
4-1 簡介 36
4-2 理論分析 36
4-2-1 小型化電路架構分析 36
4-2-2 對稱雙端短路耦合線長度選擇 42
4-2-3 具諧波抑制之傳輸零點產生機制 46
4-2-4 步階式阻抗調整零點位置 52
4-2-5 開路傳輸線形成諧波抑制 54
4-3 設計實例 56
第五章 結論 58
參考文獻 59

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