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研究生: 陳重榮
Chen, Chung-Rung
論文名稱: 微帶線雙頻帶通濾波器之研製
Design of Dual-Band Microstrip Bandpass Filters
指導教授: 蔡智明
Tsai, Chih-Ming
學位類別: 碩士
Master
系所名稱: 電機資訊學院 - 電機工程學系
Department of Electrical Engineering
論文出版年: 2003
畢業學年度: 91
語文別: 中文
論文頁數: 86
中文關鍵詞: 濾波器雙頻
外文關鍵詞: dual-band, filter
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  • 製作一個微帶線雙頻帶通濾波器,電路設計者首先必須找出具有雙頻諧振器及耦合架構,接下來則要克服兩個頻帶在輸入及輸出端的匹配問題。本論文提出利用步階阻抗的效應來設計雙頻諧振結構,然後將這類諧振器曲折及互相靠近,使在兩個頻段都達到需要的耦合量。

    為了兩個頻帶的輸出入匹配,本論文推導了諧振器負載品質因素的相關公式,另外也提出了改良式雙頻阻抗倒轉器。在目前的初步成果中,如果第二個通帶中心頻率與第一個通帶中心頻率之比值範圍在1.5到2.5之間,藉由此架構及方法都能成功地設計出二階雙頻帶通濾波器。

    To design a dual-band microstrip bandpass filter, one needs resonators and coupling structures with dual-band characteristics. Also, the matching problem of both bands at the input and output ports need to be solved. This thesis proposes a class of dual-band resonant structures based on the effect of stepped impedances. Then the resonators are bended and put close together to yield the needed dual-band coupling coefficients.

    To solve the matching problem of both bands, the thesis derives the formula of loaded Q of resonators and further proposes a modified dual-band inverter. If the ratio of second pass-band center frequency to the first one is between 1.5 and 2.5, the proposed structures and method can be used to design a second-order dual-band bandpass filter successfully.

    第一章 緒論……………………………………………………………1 第二章 微帶線平面諧振器間的耦合…………………………………3 2-1 電場性耦合………………………………………………3 2-1-1互容的等效 型電路……………………………5 2-2 磁場性耦合………………………………………………8 2-2-1 互感的等效T型電路……………………………9 2-3 反對稱的電磁場混合性耦合……………………………12 2-4 對稱的電磁場混合性耦合………………………………15 第三章微帶線雙頻帶通濾波器之架構………………………………18 3-1 Tapped-Line 帶通濾波器………………………………18 3-2 雙頻帶通濾波器之耦合架構……………………………22 3-2-1 二倍頻雙頻帶通濾波器之耦合架構……………22 3-2-2 非整數倍頻雙頻帶通濾波器之耦合架構………27 3-3 雙頻帶通濾波器之訊號輸入及輸出位置的設計………28 3-3-1 二倍頻雙頻帶通濾波器之訊號輸入及輸出位置的 設計………………………………………………28 3-3-2 非整數倍頻雙頻帶通濾波器之訊號輸入及輸出位 置的設計…………………………………………31 3-4 微帶線諧振器……………………………………………34 3-4-1 二分之一波長開路諧振器…………………………34 3-4-2 步階阻抗諧振器……………………………………35 3-5 諧振器之負載品質因素…………………………………40 3-5-1 二分之一波長開路諧振器之負載品質因素………40 3-5-2 步階阻抗諧振器之負載品質因素…………………43 3-6 阻抗倒轉器………………………………………………44 3-6-1 四分之一波長阻抗倒轉器………………………44 3-6-2 非週期性交替特性阻抗之阻抗阻抗倒轉器……46 3-6-2-1 兩段式交替特性阻抗之阻抗倒轉器…46 3-6-2-2 雙頻阻抗倒轉器………………………47 第四章 雙頻帶通濾波器設計實例……………………………………51 4-1 二倍頻雙頻帶通濾波器之設計…………………………51 4-1-1 電磁模擬…………………………………………51 4-1-2 實作與量測………………………………………60 4-2 二點五倍頻雙頻帶通濾波器之設計…………………63 4-2-1 電磁模擬…………………………………………63 4-2-2 實作與量測………………………………………73 4-3 一點五倍頻雙頻帶通濾波器之設計…………………76 4-3-1 電磁模擬………………………………………76 4-3-2 實作與量測……………………………………80 第五章 結論與展望…………………………………………………83 參考文獻……………………………………………………………………84 自述…………………………………………………………………………86

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