研究生: |
張顧耀 Ku-Yao Chang |
---|---|
論文名稱: |
離散時域技術消除耦合帶通濾波器倍頻效應 Suppression of Second and Third Harmoncs of Coupled Bandpass Filter Using Z-domain Techniques |
指導教授: |
徐敬文
Ching-Wen Hsue |
口試委員: |
黃進芳
none 張勝良 none 蔡智明 none 陳國龍 none |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電子工程系 Department of Electronic and Computer Engineering |
論文出版年: | 2006 |
畢業學年度: | 94 |
語文別: | 中文 |
論文頁數: | 80 |
中文關鍵詞: | 微帶線帶斥濾波器 、微帶線帶通濾波器 、離散時域技術 、消除倍頻效應 |
外文關鍵詞: | microstip line bandpass filter, spurious response., z-domain techniques |
相關次數: | 點閱:276 下載:1 |
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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.
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