臺灣博碩士論文加值系統

平行耦合微帶線帶通濾波器被廣泛使用在微波和毫米波系統。但由於平行耦合微帶線的奇模、偶模的相位速度不相同，會導致其有倍頻的頻率響應。在本論文中，我們將提出一種製作多頻帶的帶斥微波濾波器的新方法來抑制平行耦合微帶線帶通濾波器二倍及三倍的倍頻響應。此外，我們也將以本論文中所提出的設計方法實現具有四個傳輸零點的柴比雪夫型式II帶通濾波器。
此方法係先找出濾波器在z域中的系統方程式，然後搭配由本論文中所推導出來的各式傳輸線的鏈散矩陣，以串接、並接傳輸線的方式來完成濾波器的設計。
我們將量測各個濾波器的散射參數並與理論值進行比對，以證明本方法的可行
性。

Parallel coupled-line microstrip filter has been widely used in many microwave and millimeter wave systems. The filter usually degraded by the spurious response at twice the passband frequency, because the even and odd modes of each coupled section have different phase velocities. In this thesis, we propose a new design method to implement a microwave multi-band notch filter that suppresses the second and third harmoncs of bandpass filter. We also make use of the design method that we proposed to implement a Chebyshev type II band-pass filter with four transmission zeros.
In this method, the system function of a filter in the Z-domain is found first. Then with the chain-scattering matrices of various transmission lines derived in the thesis, the design of filter is finished with the cascading coupled, serial and shunt transmission lines. We have measured the S-Parameter of all the filters and compare those with the theoretical values to demonstrate the validity of the design method.

摘 要 I
Abstract II
誌 謝 III
目 錄 IV
圖 表 索 引 VI
表 格 索 引 VIII
第1章 緒論
1.1 研究背景與動機
1.2 研究重點
1.3 論文架構
第2章 基本理論
2.1 濾波器基本原理
2.2 數位IIR濾波器設計方式
2.2.1 類比濾波器的設計概念
2.2.2 利用雙線性轉換設計IIR濾波器
2.3 微帶線基本特性分析
第3章 分析基本傳輸線元件與串聯網路的轉移函數
3.1 鏈散射矩陣
3.2 基本傳輸線元件及其對應的鏈散射參數分析
3.2.1 串聯傳輸線分析
3.2.2 二段式並聯開路傳輸線分析
3.2.3 平行耦合線分析
3.2.3.1 低通平行耦合線
3.2.3.2 高通平行耦合線
3.3 串接網路的轉移函數
第4章 設計微波濾波器的方法
4.1 選擇理想數位濾波器及相對應的基本傳輸線元件
4.2 將T(z)及F(z)分別轉換成相對應的TAR(z)及FAR(z)
4.3 求得各段之特性阻抗
4.4 Matlab最佳化程式方法
第5章 平行耦合線奇偶模對帶通濾波器的影響
5.1 平行耦合微帶線基本特性分析
5.2 傳統巴特渥斯平行耦合帶通濾波器
5.3 延長奇模態長度法抑制二倍頻響應
第6章 理論驗證及實作
6.1 多頻帶的帶斥濾波器抑制倍頻效應
6.2 柴比雪夫型式II帶通濾波器
第7章 總結
7.1 結論
7.2 未來研究方向
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