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研究生:吳府叡
研究生(外文):Fu-Jui Wu
論文名稱:雙面印刷寬頻偶極天線設計
論文名稱(外文):Double-Sided and Printed Wideband Dipole Pair Antennas Design
指導教授:黃進芳黃進芳引用關係
指導教授(外文):Jin-Fang Huang
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:電子工程系
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:2006
畢業學年度:94
語文別:英文
論文頁數:63
中文關鍵詞: 寬頻雙頻 陣列天線 微波
外文關鍵詞:MicrowaveWidebandDual BandArrayAntenna
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在本文中探討應用於Wireless LAN 5.2 GHz頻段的寬頻偶極天線,此天線可以容易印刷在基板上並由一組偶極天線組合而成。依據傳輸線匹配理論設計一個四分之波長阻抗轉換電路來匹配天線輸入阻抗。
當需要一全方位的場形時,偶極天線是非常適用的天線。但由於偶極天線的增益並不高。在通訊系統中對於點對點傳播和具高指向性的輻射束寬之天線極感興趣。本文會針對5.2 GHz頻段來設計偶極天線並設計成陣列形式來達到高指向性的需求。另外再引入中間加載型天線的設計觀念以實現一操作於Wireless LAN雙頻段偶極天線。
論文中使用IE3D模擬軟體來分析並且和測量數據作比較。在VSWR小於2,頻率5.2GHZ所量測到的由二個印刷偶極天線組的陣列天線頻寬約為800MGz且天線增益為3-4.6dBi。而由四個印刷偶極天線組成的陣列天線頻寬約為400MHz且天線增益為5-6.4dBi。將模擬和量測數據加以比較得到相當吻合的結果。
In thesis, In ISM band the printed dipole array antenna is proposed. The printed dipole array antenna consists of one dipole array arranged back to back and can be easily formed by printing on both sides of a dielectric substrate. Based on the matching theory, which includes of a 50Ω microstrip feed line with open stub matched circuits is designed. Properties of the radiator as an array element have also been investigated. Simulator IE3D is used to verify our analysis.
The dipole antenna is a very simple antenna suitable for use when a nearly omnidirectional pattern is required. However, its gain is low. In many communication systems, one is interested in point-to-point communication, and a much more highly directive beam of radiation can be used to advantage. By arranging several dipoles into an array, a higher directive beam of radiation can be obtained. A more directive beam means that the antenna will also have a higher gain. In addition to single band antenna, we utilize parallel LC resonator to design a dual-band antenna for wireless LAN.
Both simulation and measured data are pretty matched. The printed dipole two elements array antenna achieves gain for 5.2 GHz band to be about 3-4.6 dBi with 800MHz bandwidth. The printed dipole four elements array antenna achieves gain for 5.2 GHz band to be about 5-6.4 dBi with 400MHz bandwidth.
Both simulation and measured results are highly matched. The printed dipole array antenna which is economic cost has been proposed and successfully implemented.
Contents
FIGURES AND TABLE CONTENTS VI
CHAPTER 1 1
INTRODUCTION 1
1.1 Motivation 1
1.2 Outline of the Thesis 3
CHAPTER 2 4
THEORETICAL ANALYSIS FOR DIPOLE ANTENNA 4
2.1 The Theory of Thin Dipole Antenna 4
2.2 Matching Technique 9
2.3 Self-Input Impedance 12
2.4 Effective width of half-wave dipole antenna 16
2.5 Equivalent Radii of wire dipole 17
2.6 Image Theory 18
2.7 Ground Interference Effects 21
CHAPTER 3 23
THE THEORY OF ARRAY ANTENNA 23
3.1 The Theory of Array 23
3.2 Two Isotropic Point Sources Array 24
3.3 Two-Dimensional arrays 27
3.3.1 The Broadside Array case 28
3.3.2 The End-fire case 33
3.4 Mutual Coupling Impedance 36
CHAPTER 4 39
IMPLEMENTATION AND MEASUREMENT 39
4.1 Design Method and Realization 39
4.2 Two elements array design 42
4.3 Four elements dipole array design 45
4.4 Dual-band dipole antenna design 47
CHAPTER 5 57
CONCLUSION 57
REFERENCE: 59
作者簡介 63
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