在本論文中，我們設計了超穎材料天線罩來提升天線的增益。由於定點通訊上需要高指向性的天線輻射，傳統使用陣列天線或反射式天線有其饋入設計複雜以及天線尺寸過大的缺點，我們提出較簡單的超穎材料天線罩來達成增加天線指向性的目的。
透過波導管鏡像法的等效，我們發現在四個交叉I型中的孔徑結構具有匯集電磁波的特性。在相同尺寸的天線罩上，較多孔徑的天線罩能提供更多的提升增益效果，我們設計9孔徑的天線罩能提升天線增益多達3.5 dB。另外我們使用Fabry-Perot Cavity (FPC)的概念，在相位的建設性干涉條件下，找出天線罩與天線間最適合的距離。
而現今通訊系統大多支援雙頻甚至多頻操作，為了符合實際應用面上的需求，我們設計了可使用於2.5 GHz和3.5 GHz 的WiMAX的共平面雙頻天線罩。此結構具有獨立調整某一頻帶的特性，可依不同頻帶的需求各自作變動。此共平面雙頻結構在兩頻帶分別可提升天線增益1.7 dB和2.1 dB。

In the thesis, we designed a metamaterial radome to increase the antenna gain. Owing to the need of high-directivity radiation in fix-point communications, antenna array and reflective antenna had been used to increase the directivity of antenna traditionally. Complicated feed and huge antenna size are the disadvantages of these techniques. We proposed a simpler metamaterial radome to increase the antenna gain.
We find the subwavelength-hole structure formed by four Jerusalem cross structures can collimate electromagnetic wave originally spreading out from the holes. With the same size, multiple subwavelength holes in metamaterial radome can further enhance the antenna gain. We showed that metamaterial radome with 9 subwavelength holes can improve the gain by about 3.5 dB. In addition, we applied the concept of Fabry-Perot Cavity (FPC) to find the suitable distance between the radome and the antenna. When the resulting electromagnetic waves are in-phase, the radome can increase the antenna gain effectively.
Recently, high-directivity radiation in fix-point communications is required and in the meantime multi-mode communication systems have become more and more popular. For practical purposes, we designed a coplanar dual-band metamaterial radome to be operated at 2.5 GHz and 3.5 GHz for WiMAX. This structure allows adjustment of its characteristics independently at each band. This coplanar dual-band radome can enhance the antenna gain by about 1.74 dB and 2.08 dB at 2.5 GHz and 3.5 GHz, respectively.

誌謝........................................................I
中文摘要................................................III
英文摘要................................................IV
目錄........................................................V
圖表目錄................................................VI
第一章 序論...................................1
1-1 研究動機...........................1
1-2 超穎材料簡介...................1
1-3 相關研究概況...................9
1-4 研究方法...........................10
1-5 論文大綱...........................10
第二章 超穎材料單位晶胞分析...12
2-1 週期性波導管結構...........12
2-2 極化和傳播方向與超穎材料之影響....15
2-3 雙頻負介電常數超穎材料設計............18
2-4 雙頻負導磁係數超穎材料設計............22
第三章 多孔徑超穎材料天線罩...26
3-1 單位晶胞設計...................26
3-2 孔徑內匯集電磁波現象...30
3-3 不同孔徑數之天線罩與天線增益之比較 32
3-4 天線罩與天線間距探討...35
3-5 實作與討論.......................40
第四章 共平面雙頻天線罩...........43
4-1 共平面雙頻單位晶胞設計....................43
4-2 天線罩阻抗匹配....................................46
4-3 共平面結構用於雙頻微帶天線............48
4-4 實作與量測.......................51
第五章 結論...................................57
參考文獻 ...........................................59
附錄 利用S參數萃取等效結構參數..............61

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