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博碩士論文 etd-0620106-141440 詳細資訊
Title page for etd-0620106-141440
論文名稱
Title
使用左手材料之高增益天線罩設計
Design of the antenna radome composed of metamaterials for high gain
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
89
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2006-06-12
繳交日期
Date of Submission
2006-06-20
關鍵字
Keywords
束徑寬、天線罩
Antenna radome, beam-width
統計
Statistics
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中文摘要
本文將介紹左手材料的特性,分析及探討左手材料的人工合成結構,並將結構置於天線上,討論結構對天線場型及增益造成的影響。

第一部份我們將介紹左手材料的特性與不同於右手材料中的現象,理論分析及推導達成左手材料的人工合成金屬線排列結構。接著在第二部分我們將討論並分析達成左手材料的人工合成結構的結構參數,探討參數變化對導磁係數、介電常數與折射率發生負值頻段的影響。綜合前兩章的結論,我們在第三部份將結構運用於天線罩的設計,使偶極天線的束徑寬減少31.25%,最大增益達到7.25dBi,並在第四部份討論結構表現負值頻段降頻的方法,將結構應用於較低頻段的天線罩設計,增益最大可達到7.87dBi,波束的束淨寬最大可以縮減約37.25%。最後在第五部份,我們將探討改善天線加上天線罩後可用頻寬的方法。

天線罩對於天線效能的改善將可以應用在高樓大廈間點對點的通訊,亦可以用於節省陣列天線餽入網路的成本及陣列天線上的輻射數目而達到同樣高增益的表現。
Abstract
In this thesis, the properties of the metamaterials are studied. We analyze and discuss the artificial structure called metamaterials. The the effects on the radiation pattern and antenna gain are discussed when the structure is placed above the antenna.

First, the propagation of electromagnetic wave in metamaterials is discussed. The metamaterial composed of metal rod array and split-ring is introduced. Next, the effects on permittivity, permeability and refraction index are studied when the structure parameters are changing. Thirdly, according to the above-mentioned summary, we use the structures to achieve an antenna radome. The radome can reduce 3 dB beam-width by about 31.25 percent at 10.75 GHz. The maximum gain achieves 7.25 dBi. In the fourth part, we also discusse the method of reducing the frequency band where negative refraction index occurs. The metamaterial is used to be a radome at the lower frequency band. The maximum gain is about 7.87 dBi. The 3 dB beam-width reduces by about 37.25 percent by the radome structure. Fifthly, the methods of improving the bandwidth are discussed when the antenna radome over the antenna .

The enhancement of the antenna performance can be applied to the point-to-point communication. It also can save the cost of the feed network and the numbers of array antenna.
目次 Table of Contents
致謝 I
中文摘要 II
英文摘要 III
目錄 IV
圖表目錄 VI


第一章 序論 1
1-1研究背景與動機 1
1-2研究方法 1
1-3論文架構 2

第二章 簡介與原理 3
2-1超穎材料介紹 3
2-2具負介電常數特性之人工合成結構 5
2-3具負導磁係數特性之人工合成結構 10
2-4完美透鏡特性 14

第三章 結構分析 17
3-1具負介電常數之結構 17
3-1-1增加電容性負載之分析 17
3-2具負導磁係數之結構 20
3-2-1缺口對特性參數之討論 20
3-2-2金屬線寬對特性參數之討論 22
3-2-3金屬線距對特性參數之討論 24
3-2-4波傳播方向對特性參數之討論 25
3-2-5 小結論 27
3-3合成結構 28
2-3-1共平面與非共平面之討論 28
3-4 S型結構 31
2-4-1結構特性 31
2-4-2波傳播方向的不同 34
3-5 G型結構 37


第四章 用於高頻之高增益天線罩結構 40

第五章 應用於中低頻帶天線罩結構 44
5-1結構降頻分析 44
5-1-1放大結構 44
5-1-2增加結構電容性或電感性 49
5-2應用於中低頻天線罩結構 53
5-3實作與量測 62

第六章 改善頻寬的探討 67

第七章 結論 71

參考文獻 72
參考文獻 References
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