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研究生:張天宇
研究生(外文):Chang Tien-Yu
論文名稱:共面波導方向性耦合器之設計
論文名稱(外文):Design of CPW Directional Couplers
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:96
中文關鍵詞:共面波導方向性耦合器
外文關鍵詞:CPWcoplanar waveguidedirectional coupler
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方向性耦合器在微波量測器材、微波混成電路、以及單晶微波積體電路裡面,扮演著非常重要的角色。不同耦合係數的方向性耦合器,可以使用在各種不同的應用當中。除此之外,方向性耦合器也有兩個輸出端的相位相差九十度的特性,使的它可以用在不同的電路中以達到較好的電路性能。方向性耦合器的基本原理是利用兩根四分之一波長的波導互相耦合而成。就平面電路來說,微帶線、槽線、和共面波導是最常用來製造方向耦合器的。傳統的共面波導方向性耦合器有一個很嚴重的缺點,就是如果要讓耦合量達到3dB,則兩條信號線的距離就需要非常的小,而此小的距離通常都不容易在各種的製程上達到。解決此問題最常用的方法是:利用多於兩條信號線的互相耦合來增強總體耦合的效果。在本篇論文當中,我們提出了一種更方便使用在共面波導架構的方向性耦合器。此種耦合器只需要連接兩個小耦合量的耦合器,就可以達到大耦合量的耦合器。此種方法大大的減低了製程上需要極小精確度的需求。我們在FR4的板材上製造了各種耦合量,從3dB到1dB,中心頻率為1GHz的共面波導方向性耦合器。這種新架構的共面波導方向性耦合器,也被證明了可以用在背面有金屬的共面波導上。這種新架構具有簡單的設計方法,也可以使用在單晶微波積體電路的製程上。

Directional couplers are useful components in developing measurement equipments, hybrid circuits, and microwave monolithic integrated circuits. Different levels of coupling coefficients are used in different applications. Besides, the characteristic of the quadrature phase difference could improve the performance of a circuit and makes it popular in the microwave circuit design. Directional couplers are basically composed of a pair of waveguides with the lengths of quarter wavelength. For planar transmission media, microstrip lines, slot lines, and coplanar waveguides are often used in designing directional couplers. Traditional coplanar waveguide directional couplers suffer from a serious flaw that the distance between the two signal lines has to be extremely small so as to achieve the 3dB coupling coefficient, and this small distance is usually hard to be realized in standard fabrication processes. The most popular method in solving this problem is using multi-strip lines to increase the total coupling of the directional couplers. In this thesis, novel coplanar waveguide directional couplers are developed. By properly connecting two loosely coupled directional couplers, a tightly coupled directional coupler could be realized. This type of directional couplers greatly increases the tolerance in fabrication processes. We fabricated several directional couplers with different coupling coefficients, from 1dB to 3dB, with central frequency at 1GHz on FR4 substrates. This new type of coplanar waveguide directional couplers is also proved to be useful in conductor-backed coplanar waveguide structures. The design of this new directional coupler is very easy, and it can be used in the modern microwave monolithic integrated circuits.

Chapter 1 Introduction 1
Chapter 2 Principles of Directional Couplers 8
2.1 Analysis of Symmetrical Networks 8
2.1.1 Even-Mode Excitation 11
2.1.2 Odd-Mode Excitaion 12
2.1.3 Circuit Representation with Even- and Odd-Mode
Parameters 13
2.2 Analysis of Directional Couplers 15
2.3 Forward-Wave Directional Couplers 18
2.4 Backward-Wave Directional Couplers 23
Chapter3 CPW Directional Couplers 39
3.1 Analysis of CPW Coupled Lines 40
3.2 Design of Interdifitatal Couplers 42
3.3 Fabrication of Lange Coupler 43
Chapter4 Uniplanar Tandem Couplers 51
4.1 Theory of Tandem Coupler 51
4.2 Previous Development of Tandem Couplers 55
4.3 Microstrip Line Tandem Couplers 57
4.4 Design of Tandem Couplers 58
4.5 CPW Tandem Couplers Without Backside Conductor 60
4.5.1 3dB Tandem Coupler in 50 System 61
4.5.2 3.5dB Tandem Coupler in 100 System 62
4.5.3 2.1dB Tandem Coupler in 100 System 64
4.5.4 1.3dB Tandem Coupler in 100 System 65
4.6 Tandem Coupler With Conductor-Backed CPW 66
4.7 Summary 68
Chapter 5 Conclusion 91
References 94

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