本&;#63809;文前半部提出一個中心頻&;#63841;為2.5GHz 的寬頻微波岔&;#63799;環。此電路利用平衡式微帶線來激發並使用一個理想反相器取代一段二分之一波長傳輸線，可使頻寬接近120%和使體積縮小為原&;#63789;的50%等優點。
本&;#63809;文後半部份利用前半部分的寬頻微波岔&;#63799;環實現一個中心頻&;#63841;為2.5GHz 的180°寬頻反射式數位移相器。不同於傳統的反射式移相器將PIN二極體加在90°混成器上，把PIN二極體加在180°混成器並將兩個PIN二極體一順偏一反偏或一反偏一順偏可得頻寬更寬以及兩個狀態介入損失相接近的180°反射式移相器。此論文全部電&;#63799;以微帶線型式製作在介電係&;#63849;為3.58厚&;#64001;為20mil的RO4003的基板上。

This thesis includes two parts. In the first part, the 180° hybrid ring with a center frequency of 2.5GHz and excited by the balanced microstrip line is designed. By replacing a half wavelength transmission line with an ideal phase inverter, the 180° hybrid ring exhibits a wide bandwidth of almost 120% and the size reduced for 50%.
In the second part, by using the broadband 180° hybrid ring designed in the first part, the broadband 180° reflection type digital phase shifter has been realized. Unlike the conventional reflection type phase shifter where two PIN diodes are connected to a 90° hybrid ring with the same bias condition, in the proposed phase shifter two PIN diodes are connected to the 180° hybrid ring with opposite bias condition. The proposed one can get much wider bandwidth with almost the same insertion loss in two phase states. The whole circuits in this thesis are fabricated with microstrip line on a RO4003 substrate with a dielectric constant of 3.58, a thickness of 20 mil.

Abstract(Chinese) i
Abstract ii
Acknowledgement iii
Table of Contents iv
List of Tables v
List of Figures vi
Chapter 1 Introduction 1
Chapter 2 Broadband 180° Hybrid Ring 3
2.1 Introduction 3
2.2 Theory 4
2.2.1 Broadband 180° Hybrid Ring 4
2.2.2 Balanced Microstrip Line 8
2.3 Design Procedure and Simulation 11
2.3.1 Implementation of -90° Balanced Microstrip Line 11
2.3.2 Implementation of 90° Inverted Balanced Microstrip Line 13
2.3.3 Implementation of Taper Line 15
2.3.4 Implementation of Broadband 180° Hybrid Ring 17
2.4 Fabrication and Measurements 21
Chapter 3 180° Reflection Type Phase Shifter 26
3.1 Introduction 26
3.2 Theory 28
3.2.1 Reflection Type Phase Shifter Using 90° Hybrid Coupler 28
3.2.2 180° Reflection Type Phase Shifter Using 180° Hybrid Ring 32
3.3 Design Procedure and Simulation 36
3.3.1 PIN Diode Equivalent Circuit 36
3.3.2 Tuning Procedure of Loading Circuit 38
3.4 Fabrication and Measurements 45
3.4.1 Loading Circuit of 180° Reflection Type Phase Shifter 45
3.4.2 180° Reflection Type Phase Shifter 48
Chapter 4 Conclusion 53
References 57

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