跳到主要內容

臺灣博碩士論文加值系統

(3.231.230.177) 您好!臺灣時間:2021/07/28 14:20
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

我願授權國圖
: 
twitterline
研究生:陳宏圖
研究生(外文):CHEN, HONG TWU
論文名稱:球面圓形微帶天線之研究
論文名稱(外文):Studies of a Spherical-Circular Microstrip Patch Antenna
指導教授:翁金輅翁金輅引用關係
指導教授(外文):WONG, KIN LU
學位類別:博士
校院名稱:國立中山大學
系所名稱:電機工程研究所
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:1994
畢業學年度:82
語文別:中文
論文頁數:126
中文關鍵詞:微帶天線散射單軸非等向性
外文關鍵詞:Microstrip patch antennaScatteringUniaxial anisotropy
相關次數:
  • 被引用被引用:0
  • 點閱點閱:69
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
本篇論文以全波分析法及空腔模式來分析球面圓形微帶天線的各項特性。
在全波分析過程中,數值計算所採用的方法為 Galerkin''s moment
method。首先推導電磁場於單軸 (uniaxial) 介質中傳播之波動方程及該
波動方程的解。並計算單軸介質球的散射 (scattering) 特性,藉此驗證
推導的正確性。接著以全波分析的方法,探討球面圓形微帶天線,當其基
底具有單軸非等向性時,其對共振頻率、輻射場型及散射特性之影響。為
了改進球面圓形微帶天線的頻寬,本文中提出以基底氣隙 (airgap) 的方
法來增加球面圓形微帶天線的頻寬。最後,計算同軸探針饋入 (coaxial
probe feed) 之球面圓形微帶天線的交叉極化 (cross-polarization) 特
性及輸入阻抗 (input impedance)。
The spherical-circular microstrip patch antenna is studied
extensively in this dissertation. Formulation and numerical
results for the problems of resonance, radiation, scattering,
and probe-fed excitation are presented. Most of the problems
are solved by using a full-wave analysis incorporating
Galerkin''s moment method. And, for the excitation problem of
using a coaxial probe feed, both the full-wave and the cavity-
model analyses are used for the theoretical treatment. Wave
propagation inside a uniaxially anisotropic medium is first
derived in spherical coordinates. It is found that, the
effects of the uniaxial anisotropy can be included in the
formulation simply by introducing a modified spherical Bessel
function into the field expression. The derivation procedure
for the modified spherical Bessel function is described. A
scattering problem of a uniaxial sphere illuminated by a plane
wave is solved to verify the correctness of the results. For
the purpose of improving the bandwidth of the spherical
microstrip antenna, a novel structure with an airgap between
the substrate and the ground sphere is developed. In this
study, the full-wave analysis is used for the theoretical
treatment, and the information of the half-power bandwidth is
obtained from the complex resonant frequency. This study is
performed by solving the resonance problem of a spherical-
circular microstrip structure with an airgap. Numerical
results indicate that, with increasing airgap thickness, the
antenna bandwidth can be considerably enhanced.
封面
ABSTRACT
TABLE OF CONTENTS
LIST OF FIGURES
CHAPTER 1 INTRODUCTION
1.1 Motivation
1.2 Overview of the theories used in this dissertation
1.2.1 Cavity-model analysis
1.2.2 Full-wave analysis
1.3 Organ ization'' of the dissertation
CHAPTER 2 SCATTERING FROM A UNIAXIAL SPHERE
2.1 Waves in a uniaxial medium
2. 1. 1 Fundamental field equations
2.1.2 Spherical wave functions
2.2 Scattering problem of a uniaxially anisotropic sphere
2.2.1 Theoretical treatment
2.2.2 Numerical results and discussion
CHAPTER 3 FULL-WAVE ANALYSIS OF A SPHERICAL-CIRCULAR :IMICROSTRIP ANTENNA
3.1 Theoretical formulation
3.1.1 Green''s-fanction. formulation for the field generated by the disk current
3.1.2 Scattering from a conducting sphere with a uniaxialdielectric coating
3.1.3 Galerkin''s moment method
3.2 Numerical results and discussion
3.2.1 Numerical results for resonance
3.2.2 Numerical results for radiation
3.2.3 Numerical results for RCS
CHAPTER 4 BROADBAND SPHERICAL-CIRCULAR MICROSTRIP ANTENNA WITH AN AIRGAP
4.1 Theoretical Formulation of the Problem
4.2 Numerical Results and Discussion
CHAPTER 5 THE EXCITATION PROBLEM OF A SPHERICAL-CIRCULAR MICROSTRIP ANTENNA USING A COAXIAL PROBEFEED
5.1 Full-wave analysis
5. 1. 1 Theoretical formulation
5.1.2 Numerical results and discussion
5.2 Cavity-model analysis
5.2.1 Theoretical formulation
5.2.2 Numerical results and discussion
CHAPTER6 CONCLUSIONS
APPENDIX A MODIFIED SPHERICAL BESSEL FUNCTION
APPENDIX B SPHERICAL HARMONIC EXPANSION FOR A PLANE WAVE
APPENDIX C PROGRAM OF THE MODIFIED SPHERICAL BESSEL FUNCTION
APPENDIX D VECTOR LEGENDRE TRANSFORM
APPENDIX E BASIS FUNCTION
APPENDIX F PROGRAM OF THE LEGENDRE FUNCTION
REFERENCES
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top