臺灣博碩士論文加值系統

共平面波導 (Coplanar Waveguide, CPW)至今己廣泛使用於各種微波電路以及元件的設計，為其中一種最基本的傳輸線．過去文獻討論有限/無限接地面的共平面波導、背覆導體的共平面波導、或是更多共平面對稱形金屬板的共平面波導己經有近似的解析解．甚至今日盛行的全波模擬軟體己經可以快速精準的得到任意形式傳輸線的特徵阻抗與等效介電常數．然而對於非對稱共平面波導(即耦合線)，設計者無法給予它單埠的共差模解耦合埠的特徵阻抗以及四埠阻抗參數(Z parameter)，即使全波模擬軟體也沒有直接的萃取方式．本篇論文利用複數分析的保角映射方法得到非對稱共平面耦合線的傳輸線特徵，並使用它來做平面型的天線設計如雙頻天線，空間濾波器與波束切換天線．

So far, the coplanar waveguides (CPW) are extensively used for all kinds of microwave circuits and components, it is one of the most basic transmission lines. In the past, numerous papers had solved the analytical solution for the finite/infinite ground-plane CPW, conductor backed CPW and symmetrical multi-metal-plate CPW. There are many full-wave simulators available for evaluating arbitrarily shaped transmission-line parameters such as characteristic impedance and effective dielectric constant. However, for asymmetrical CPWs (e.g. coplanar coupled line), designers are still unable to obtain the decoupled common/differential-mode port characteristic impedance and four-port Z parameters from commercial full-wave electromagnetic field simulation software directly. This thesis utilizes the conformal mapping method of complex analysis to obtain the decoupled common/differential-mode port characteristic impedance and effective dielectric constant that can be used for planar antenna designs such as dual-band antenna, spatial filter and beam-switching antenna.

中文摘要 I
ABSTRACT II
誌　　謝 III
Tables of Contents IV
LIST OF FIGURES V
LIST OF TABLES VI
Chapter 1 Introduction 1
1.1 Motivation 1
1.2 Objective 1
Chapter 2 The Coupled-Line Parameters of the Asymmetrical Coplanar Waveguide 3
2.1 The Common-/Differential-Mode Definition of the ACPW 3
2.1.1 The common-mode decoupled port extraction of the ACPW 5
2.1.2 The differential-mode decoupled port extraction of the ACPW 9
2.1.3 The Coupled-Line Parameters of the ACPW 10
2.2 The four-port z parameter of the ACPW 11
2.2.1 The voltage and current ratio of the ACPW 12
2.2.2 The four-port z parameter of the ACPW 13
Chapter 3 Design and study of UCILA for single-/dual-band operation 18
3.1 The dual-band mechanism of UCILA 19
3.2 The UCILA for dual-band operation 24
3.2.1 Antenna frequency characteristic 24
3.2.2 Antenna radiation characteristic 27
3.3 The UCILA for frequency-switching operation 29
3.3.1 Antenna frequency characteristic 29
3.3.2 Antenna radiation characteristic 32
Chapter 4 Design and study of MIMO antenna using UCILA for isolation enhancement 39
4.1 Band stop mechanism 39
4.2 Antenna frequency characteristic 40
4.3 Antenna radiation characteristic 43
Chapter 5 The beam-switching capacitive-gap coupled ACPW antenna 45
5.1 The ACPW common-mode characteristic impedance 46
5.2 The two-port capacitive gap coupled ACPW resonator 47
5.3 The beam-switching antenna characteristics 54
Chapter 6 Conclusions 60
Reference 61
Vita 64

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