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研究生:張振元
研究生(外文):Chang Cheng-Yuan
論文名稱:共面波導帶通濾波器之設計
論文名稱(外文):Design of Coplanar-Waveguide Band-Pass Filters
指導教授:陳俊雄陳俊雄引用關係
指導教授(外文):Chun Hsiung-Chen
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:電信工程學研究所
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:2002
畢業學年度:90
語文別:中文
論文頁數:84
中文關鍵詞:共面波導帶通濾波器
外文關鍵詞:Coplanar WaveguideBandpass Filter
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在通訊系統中,濾波器是一個重要且不可或缺的元件,而操作在微波頻段的濾波器,可以用傳輸線架構如波導、微帶線、帶線來設計。由於共面波導相對於傳統得傳輸線,有許多獨特又具吸引力的特點,使得越來越多的研究專注在共面波導這方面上。
為了能夠充分利用這些優點,本論文即使用共面波導來設計帶通濾波器。文獻中,已經提出了共面波導間隙耦合帶通濾波器及共面波導電感耦合帶通濾波器,這兩種帶通濾波器是使用二分之一波長波長傳輸線當作共器,這些濾波器會在電路中佔有大塊面積,本論文將提出兩種帶通濾波器。
我們首先介紹窄頻電感耦合半波長濾波器、電容耦合半波長濾波器,及電感電容耦合四分之一波長濾波器;接著,利用步階阻抗結構代替傳統的四分之一波長共振器,以縮小電路面積。而採用步階阻抗結構當作共振器的濾波器,其尺寸只有傳統電感電容耦合濾波器的三分之二。
接著,我們使用一個非常簡單的方法,使用四分之一波長開路並接截線結構來設計截止區中的衰減極點。更進一步,我們使用步階阻抗共振器,來縮小電路面積。而一個具有衰減極點且能縮小電路面積的濾波器,可以被實現。
本論文提出的兩種共面波導帶通濾波器架構,都有易於設計、通帶損耗低的特性,也很容易製做在微波積體電路(MIC)及單晶微波積體電路(MMIC)中。
Filter is an indispensable and important component in communication system. At microwave frequencies, filter can be realized by transmission-line structures such as waveguide, microstrip, and strip line. Because coplanar waveguide(CPW) has many unique and attractive features over traditional transmission lines, there are more and more researches focus on CPW.
To fully utilize the advantages of CPW, this study uses the coplanar waveguide to design the band-pass filter. The CPW gap-coupled band-pass filter and the inductive- coupled band-pass filter have been reported in the scientific and technical literature, and these filters used λ/2 orλ/4 transmission-line to be a resonator. These filters would occupy large area. In this study, two CPW band-pass filters are proposed.
First, we examine the inductive-coupled half-wave filter, capacitive-coupled half-wave filter, and LC-coupled quarter-wave filter which are suitable for narrow-band applications. Then, a narrow-band reduced size CPW band-pass filter structure is proposed which is a modified version of the conventional λ/4 resonator composed of stepped-impedance. The final reduced size filter has a size which is 2/3 of the traditional LC-coupled λ/4 CPW filter.
Next, we propose a very simple method for creating multiple attenuation poles of a band-pass filter based on a λ/2 orλ/4 coplanar waveguide resonator with λ/4 open stub structures. Moreover, miniaturization of the CPW band-pass filter using a stepped impedance resonator is also carried out. As a consequence, the band-pass characteristics with multiple attenuation poles are obtained together with the reduced filter size. The derivation of multiple attenuation poles and the method for reduced filter size are detailed.
Two proposed filters in this study both have the features of simple design and low loss, and are easy to be fabricated by integrated in MIC’s and MMIC’s systems.
第一章 簡介 1
第二章 濾波器設計原理 7
2-1 濾波器簡介 7
2-2 集總式濾波器理論分析 8
2-3 分散式帶通濾波器 12
第三章 窄頻共面波導帶通濾波器 34
3-1 半波長共振器帶通濾波器 35
3-2 四分之一波長共振器帶通濾波器 42
3-3 步階阻抗共振器帶通濾波器 44
3-4 結論 46
第四章 具有止帶衰減極點之窄頻共面波導帶通濾波器 63
4-1 止帶衰減極點之設計 64
4-2 止帶衰減極點帶通濾波器 65
4-3 結論 67
第五章 結論 79
參考文獻 82
參考文獻
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