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研究生(外文):Hung-chi Huang
論文名稱(外文):Gain-Enhanced Metamaterial Radome for Dual- and Circularly-Polarized Antenna and Study of Negative Group Delay Effect
指導教授(外文):Lin Ken-Huang
外文關鍵詞:Circularly-Polarized AntennaRadomeDual-Polarized AntennaNegative Group Delay Effect
  • 被引用被引用:1
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Owing to the need of high-directivity radiation in fix-point communication, this thesis designs the metamaterial with 4-fold rotational symmetric unitcells. Using their nearing-zero refractive index along two polarizations, we can get gain-enhanced antenna radomes and place them above dual- and circular-polarized antenna to verify our idea.
It is known that the group delay variation in a communication system causes the degradation of symbol error rate, and positive group delay (GD) causes delay in signal propagation. Therefore, this research studies the negative group delay (NGD) behavior of metamaterial. Through analyzing the GD of metamaterial equivalent circuit caused by poles and zeros, we design a novel NGD bandpass circuit. Furthermore, this thesis develops graphic method for group delay investigatiion and study the relationship between NGD, loss and gain in order to simplify the design of GD compensation circuit.
中文摘要 i
英文摘要 ii
目錄 iii
圖表目錄 vi
第一章 緒論 1
1-1 研究動機 1
1-2 論文大綱 1
1-3 研究方法 2
第二章 負相位速度與負群速度介紹 6
2-1 雙負材料特性 6
2-2 人工合成物質 11
2-3 超穎材料應用 17
2-4 單一陣元設計設計準則 19
2-5 負群延遲補償 21
第三章 交叉I形結構 23
3-1 單一陣元設計 23
3-2 交叉I形結構天線罩應用於雙極化天線 27
3-3 交叉I形結構天線罩應用於圓極化天線 32
3-4 心得與小結 34
第四章 交叉S形結構 35
4-1單一陣元設計 35
4-2 交叉S形結構應用天線罩於雙極化天線 36
4-3 交叉S形結構天線罩應用於圓極化天線 38
4-4 心得與小結 41
第五章 超穎材料於負群延遲討論 43
5-1超穎材料負群延遲觀察 43
5-1-1 人工合成材料模擬 43
5-1-2 等效電路模擬 44
5-2 極點與零點對群延遲的影響 45
5-2-1單一極點群延遲變化 45
5-3群延遲作圖法 50
5-4損耗與負群延遲的關係 52
5-5 心得與小結 55
第六章 總結與未來工作 56
6-1 總結 56
6-2 未來工作 56
參考文獻 58
附錄一 多項式定理證明無損網路零點位置 A
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