本論文將介紹利用人工合成結構的左手材料特性，製做高增益天線罩。
我們將介紹超穎材料的特性與不同於右手材料中的現象，並理論分析及推導達成超穎材料的人工合成金屬線排列結構。針對在目前左手材料在高頻時的結構提出降頻的方法達到更實用的頻段，並探討參數變化對導磁係數、介電常數與折射率發生折射率的絕對值小於1及負值頻段的影響。前述的分析與想法，我們將結構做調整，讓可使用的頻段增加，為了避免金屬線的反射造成損耗過多，因此我們將單一單元的結構做簡化，提出較簡單的結構。綜合前述的分析與模擬，我們再將此結構運用於天線罩的設計，使patch天線的束徑寬減少30%。最後我們設計一個具有寬頻負折射率的左手材料「合併式環型共振氣隙」，此合併式環型共振氣隙單一單元結構能夠減少天線束徑寬，合併式環型共振氣隙的負折射率相對頻寬為36.5%。接著天線設計應用於WiMAX頻帶上，為了減少介質損耗，將介質基板移除，直接使用金屬線當做天線罩，並且達到減小天線束徑寬的效果。

In this thesis, we described our efforts to achieve antenna radomes that enhance antenna gain by using the artificial synthesis structure of the left-handed material.
The characteristics of the metamaterial are introduced. Also, we will analyze the phenomena of the left-handed material which distinguish them from the right-handed material. Moreover, we analyze and derive the theory to obtain the effect of the meta-materials with the metal line artificial synthesis array structure. Then, we will focus on the method of lowering the frequency of the left-handed material structure and discuss the frequency influence of the permeability, permittivity, and refractive index as the modulus of the refractive index is smaller than one or negative. We will adjust the structure to allow a wider useful frequency bandwidth. In order to prevent from the reflection of the metal lines to cause too much loss, we will simplify the structure of the single unit. Making use of the above-mentioned methods, we use the material to achieve an antenna radome. The meta-material radome can reduce the 3 dB beam-width by about 30 percent compared with the conformal patch at 5.25 GHz. Finally, we design a novel structure of unit cell based on the CSRR which is provided with a broadband negative index of refraction. The relative bandwidth of the LHM proposed in this thesis is 36.5%. In order to reduce loss tangent we remove the dielectric substrate, which further reduce the 3 dB beam-width.

目錄
致謝 I
中文摘要 .II
英文摘要 III
目錄 IV
圖表目錄 VI
表格 X

第一章 前言 1

第二章 基本原理 2
2-1 Veselago的介質 2
2-2負介電常數的人工結構 5
2-3負導磁係數的人工結構 7
2-4 μ，ε雙負的人工結構 8
2-5指向性結構 9

第三章 單一個單元結構分析 12
3-1交叉I型結構 12
3-1-1基板為Rogers duroid 5880的交叉I型結構 12
3-1-2基板為FR4的交叉I型結構 15
3-2交叉I型加ｃ型結構 21
3-2-1加兩個ｃ型於交叉I型共平面結構 21
3-2-2承2-2-1結構加兩個ｃ型於單一個單元的另一面 27
3-3承3-1的結構單一個單元加桿子 31

第四章 具有指向性之單一單元 38
4-1旋轉交叉I型結構 38
4-2簡化旋轉交叉I型結構 40

第五章 指向性天線罩及具有寬頻負折射率特性之左手材料 43
5-1具有指向性天線罩 43
5-1-1旋轉交叉I型結構 44
5-1-2簡化旋轉交叉I型結構 46
5-2具有寬頻負折射率特性之左手材料 50
5-3具有雙負寬頻特性之左手材比較 56
5-4具有指向性之天線罩 57

第六章 結論 60

參考文獻 61

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