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研究生:鄭漢維
研究生(外文):Jheng, Han-Wei
論文名稱:蕈狀結構於複合左右手洩漏波天線的應用
論文名稱(外文):Mushroom Structure for Composite Right/left Handed Leaky Wave Antenna Applications
指導教授:林育德林育德引用關係
指導教授(外文):Lin, Yu-De
學位類別:碩士
校院名稱:國立交通大學
系所名稱:電信工程研究所
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:2010
畢業學年度:99
語文別:中文
論文頁數:49
中文關鍵詞:蕈狀結構複合左右手洩漏波超材料特徵模態
外文關鍵詞:mushroom structurecomposite right/left handedleaky wavemetamaterialseigenmode
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傳統洩漏波天線,需要較複雜的饋入電路以激發高階模,只能前向掃描。而複合左右手(composite right/left handed, CRLH)洩漏波天線具有從後向到前向掃描能力,而且只需簡單和有效的饋入結構。
蕈狀結構有很多獨特的電磁特性,也可被用作一種二維的複合式左右手結構超材料(metamaterials)。在本論文中,利用特徵模態(eigenmode)分析蕈狀(mushroom)結構的色散圖,並觀察各模態的電場和磁場,確定結構的特性。由色散圖得到可輻射的頻率範圍,並建立等效電路。然而使用特徵模態解出的第一個模態,是不會存在背向的洩漏波,和等效電路預測的不同,我們會透過量測,驗證哪一個才是正確。
先利用單一微帶線去饋入蕈狀結構之複合左右手洩漏波天線,但天線在左手洩漏波區時,增益比較低,所以利用一分二的功率分波器,去饋入天線。頻寬從5.6GHz到9.35GHz,增益在頻段內都有達到10dBi以上,掃描角度為-51度順時針轉到69度。而由遠場量測得到的主波束輻射角,來推得相位常數。

Typically, the leaky wave antenna is fed by a complex feeding structure to excite the higher order mode and it exhibits forward angle scanning characteristic. The composite right/left handed (CRLH) leaky wave antenna exhibits continuous backward-to-forward angle scanning characteristic and the broadside radiation capability. Moreover, it can be fed by a very simple and efficient (small and broadband) feeding structure.
Mushroom structure exhibits unique electromagnetic properties, and it can be used for one kind of the 2-dimentional metamaterials. In the thesis, we use the eigenmode to analysis the dispersion diagram of the mushroom structure and we observe the electric field and magnetic field of each mode to understand characteristics of the mushroom structure. We acquire the radiation region from the dispersion diagram, and the mushroom structure can be represented by an equivalent circuit model. One of the mode solved by eigenmode method shows that this structure is unable to exhibit backward leaky wave; the circuit model constructed, however, predicts that the structure should be able to support backward leaky wave. We verified this contradiction by measuring the actual structure.
First, we use single microstrip line to feed the composite right/left handed leaky wave antenna composed by the mushroom structure. However, the antenna gain is lower in the left-handed leaky wave region than in the right-handed leaky wave region. Thus, we use a 2-way power divider to feed the antenna. The bandwidth of the antenna fed by 2-way divider is from 5.6 GHz to 9.35 GHz, and the angle of radiation rotates clockwise from -51 to 69 degree. The antenna gain is over 10 dBi within the bandwidth. In addition, we acquire the angle of radiation of the main beam by far-field measurement, so we can calculate the phase constant.

中文摘要 i
英文摘要 ii
誌謝 iv
目錄 v
圖錄 vi
表錄 ix
第一章 序論 1
1.1 動機與目的 1
1.2 章節大綱 2
第二章 超材料簡介以及複合左右手傳輸線 3
2.1 超材料簡介 3
2.1.1 Smith左手結構材料 4
2.1.2 傳輸線理論 5
2.1.3 平衡狀況下的複合左右手傳輸線 9
2.1.4 複合左右手傳輸線的實現 11
2.2 洩漏波天線 12
2.2.1 基本原理 12
2.2.2 複合左右手洩漏波天線 13
第三章 二維複合左右手傳輸線 15
3.1 二維複合左右手傳輸線特徵值 15
3.1.1 特徵值矩陣形式 16
3.1.2 二維複合左右手傳輸線色散關係 18
3.1.3 二維複合左右手傳輸線實現 20
3.2 二維複合左右手傳輸線特徵模態分析 21
第四章 蕈狀結構之複合左右手洩漏波天線 27
4.1 使用單一微帶線饋入蕈狀結構之複合左右手洩漏波天線 27
4.1.1 天線的設計與模擬 27
4.1.2 遠場輻射場型的模擬 29
4.2 使用一分二功率分波器饋入蕈狀結構之複合左右手洩漏
波天線 35
4.2.1 饋入電路結構設計 35
4.2.2 天線的設計與量測 36
4.2.3 遠場輻射場型的模擬與量測 38
第五章 結論 47
參考文獻.........................48

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