| 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 |
| 相關次數: | 點閱:67 下載:7 |
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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.
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