以離散時域與誘發通帶技術設計可調式濾波器｜國立臺灣科技大學博碩士論文系統

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研究生：	繆東霖 Dong-Lin Miao
論文名稱：	以離散時域與誘發通帶技術設計可調式濾波器 Design of Tunable Filters Using z-Transform Technique and Induced Bandpass Method
指導教授：	徐敬文 Ching-Wen Hsue
口試委員:	黃進芳 Jhin-Fang Huang 張勝良 Sheng-Lyang Jang 陳國龍 Kuo-Lung Chen
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：	2010
畢業學年度：	98
語文別：	英文
論文頁數：	98
中文關鍵詞：	可調帶斥濾波器、可調帶通濾波器、二階開路殘段、離散時域技術
外文關鍵詞：	Tunable bandstop filter, tunable bandpass filter, two-section stub, z domain technique
相關次數：	點閱：298 下載：1
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本論文中，我們提出兩種設計可調式濾波器的方法，一種是利用等長度二階殘段，另一種為利用離散時域技術和誘發通帶技術。依據所需要的可調式濾波器之頻率響應來決定選用何種架構和設計方法。最後，將本論文所提出的設計方法實現三種濾波器，包含可調式之帶通和帶拒濾波器，以及可調式窄頻帶通濾波器。
在利用等長度二階殘段設計可調式之帶通和帶拒濾波器上，將變容二極體放置在一階和二階開路殘段上，變化電容值，調整濾波器之中心頻率，在帶拒濾波器上具有抑制高次諧波之機制；在帶通濾波器上具有抑制諧波和較高的IP3約為43.5dBm，實驗結果驗證設計之理論具有一致性。此方法具有可調式之機制，機動性佳，只需改變輸入電壓就可控制中心頻率且通帶頻寬保持一致，並有抑制高次諧波之效果。
另外利用離散時域技術和誘發通帶技術設計可調窄頻帶通濾波器，將等長度二階開路殘段並接變容二極體及z轉換技術在設計濾波器上的應用，與一般的濾波器設計方法不同，此方法利用斥帶的傳輸零點控制濾波器的頻率響應，且利用並聯二階開路殘段使其誘發通帶之特性，設計可調式窄頻帶通濾波器。最後，為了使尺寸更小，再改變產生高頻衰減極點的兩階並聯開路殘段的正規化頻率。此方法具有較窄之頻寬且其截止帶的衰減率較高，並有抑制高次諧波之效果。

In this thesis, we propose the two design method of tunable filters, one is equal-length two-section stubs and another one is the composite method adopting both the discrete-time domain method and induced passband scheme. We determine the construction of filter and design method according to the frequency response. Finally, we propose the design method that we can implement three types of filters including tunable bandstop/bandpass filter and tunable narrow bandpass filter.
Microwave tunable bandstop and bandpass filter design using equal-length transmission lines is presented. Varactors shunted with one-section and two-section stubs are employed to control the center frequency of the filters. The tunable bandstop filter is featured with extended upper passbands. The tunable bandpass filter is featured with reduced harmonic passbands and IP3 value of 43.5 dBm.
Tunable narrow bandpass filter using z-transform technique and induced bandpass method. Varactors diode shunted with two-section stubs are employed to control the center frequency of the narrow bandpass filter. In addition, extended upper passbands is characteristic of the tunable narrow bandpass filter.
Eventually, Experimental results are presented to illustrate the validity of the two design method.

摘　要.....................................................................I
Abstract..................................................................II
致  謝...................................................................III
Contents.................................................................V
List of Figures..........................................................VII
List of Tables..........................................................XI
Chapter 1  Introduction....................................................1
1.1  Motivation............................................................1
1.2  Tunable Microwave Filters.............................................2
1.3  Proposal..............................................................3
1.4  Organization of Chapters..............................................4
Chapter 2  Basic Theory....................................................5
2.1  Discrete-Time Filter..................................................5
2.2  Bilinear Transformation...............................................7
2.3  The Modified Yule-Walker Equation.....................................9
2.4  Microstrip Line......................................................15
Chapter 3  Transfer Functions of Transmission Line and Cascaded Networks..18
3.1  Chain-Scattering Parameters..........................................19
3.2  Fundamental Circuits and Their Chain-Scattering Parameters...........21
3.2.1  A Serial Transmission-Line Section.................................22
3.2.2  An Open-Circuited Single-Section Stub..............................25
3.2.3  A Short-Circuited Single-Section Stub..............................27
3.2.4  An Open-Circuited Two-Section Stub.................................29
3.3  Transfer Functions of Cascaded Networks..............................32
3.4  Summary..............................................................35
Chapter 4  Method for Design of the Tunable Microwave Filters.............37
4.1  Design Microwave Filters by z-Transform Technique....................37
4.2  Characteristics of Equal-Length Two-Section Stub.....................42
4.3  Effect of Shunt Varactor on Scattering Characteristics...............44
4.3.1	Characteristics Analysis.........................................44
4.3.2	Simulation Results	...............................................47
4.4  Induced Narrow Bandpass Scheme.......................................50
Chapter 5  Implementation and Experimental................................55
5.1  Tunable Bandstop and Bandpass Filter using z-Domain Method...........56
5.1.1	Tunable Bandstop Filter..........................................56
5.1.2	Tunable Bandpass Filter..........................................61
5.2  Tunable Narrow Bandpass Filter Using Parallel Stubs and z-Domain Method....................................................................68
Chapter 6  Conclusion.....................................................77
6.1  Conclusion...........................................................77
6.2  Future Work..........................................................78
References................................................................79

                                

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