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研究生:賴詩薇
研究生(外文):Lai, Shih-Wei
論文名稱:具平坦截止頻帶之新型雙通帶濾波器
論文名稱(外文):New Dual-Band Bandpass Filter with Desired Flat Rejection Bands
指導教授:郭仁財
指導教授(外文):Kuo, Jen-Tsai
學位類別:碩士
校院名稱:國立交通大學
系所名稱:電信工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2010
畢業學年度:98
語文別:中文
論文頁數:45
中文關鍵詞:帶通濾波器雙頻帶微帶線平面式電路傳輸零點
外文關鍵詞:bandpass filterdual-bandmicrostripplanar circuittransmission zero
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本文提出一個新型雙通帶濾波器的設計,單一級電路包含兩個電路並聯,其一是四分之一波長的耦合線串聯四分之一波長的傳輸線,其二是其串聯反向電路。將多個單一級電路直接串接即可得到多級電路,不僅增進通帶頻率的選擇度,也增加截止帶的衰減量。本文所提出的電路,在兩通帶之兩側以及截止頻帶中有多個傳輸零點。本文以傳輸線理論分析單一級電路,並提供一級與二級電路雙通帶響應的相關設計圖。在實作方面,將指叉式電容加入耦合線的兩端,補償奇偶模波速不相等的問題,藉以改善截止頻帶中的抑制量。本文提供四個實作電路的模擬與量測比較,以驗證此設計。
A new circuit structure is proposed for design of dual-band bandpass filters. A one-stage circuit consists of two two-port networks in shunt connection; one is a coupled-line section of λ/4 long followed by a transmission line segment of identical length, and the other has the same elements but cascaded in reverse order, where λ/4 is the wavelength at arithmetic mean frequency of the two passbands. Higher-orders circuits can be obtained by directly cascading two or more such stages and show improved frequency selectivity. In addition to on both sides of the passbands, transmission zeros are also created in the rejection bands. Analysis of the one-stage circuit is formulated by the transmission line theory and design curves for one- and two-stage circuits are provided. In realization, interdigital capacitors are incorporated with the λ/4 coupled sections for compensating the effect of unequal modal phase velocities on the filter performance in the rejection band. Two circuits are fabricated and measured to validate the idea.
中文摘要.............................................. i
英文摘要.............................................. ii
致謝.................................................. iii
目錄.................................................. iv
表目錄................................................ v
圖目錄................................................ vi
第一章 簡介......................................... 1
第二章 雙通帶濾波器設計電路架構與分析............... 4
2-1平行耦合級傳輸之網路參數.................. 4
2-2濾波器電路分析............................ 9
2-3雙頻帶[S]參數頻率響應與其零點位置......... 13
2-4多級電路.................................. 17
第三章 模擬與實作電路量測.......................... 28
3-1耦合微帶線奇偶模波速之補償................ 28
3-2電路實作與量測結果........................ 31
第四章 結論........................................ 42
參考文獻..................................... 43

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