林怡成臺灣大學:電信工程學研究所李炳勳Li, Bing-SyunBing-SyunLi2010-07-012018-07-052010-07-012018-07-052008U0001-2506200813180400http://ntur.lib.ntu.edu.tw//handle/246246/188195摘要 本論文提出一種新穎的覆背式電磁能隙圓極化方型截角槽孔天線,此天線結構有三層,其基本原理是以第一層微帶線作為饋入裝置來激發第二層的截角方形槽孔,而此槽孔內部則以蘑菇狀電磁能隙單元作為覆背,目的是為了讓此天線變成單向輻射,有助於在通信連結上的應用性。 本論文所提出的覆背式電磁能隙圓極化截角方型槽孔天線是設計在X頻帶,我們利用印刷電路板FR4來實現我們的設計,天線形狀為邊長30公釐的正方形,由量測結果知天線返回損失(小於-10dB)的頻寬有9% ,橢圓軸長比(小於3dB)的頻寬有8% ,天線增益在頻寬內約有3~4dBic的圓極化增益。另外我們設計一循序式旋轉的2X2陣列, 陣列形狀為邊長52公釐的正方形, 天線的返回損失(小於-10dB)的頻寬有27%,橢圓軸長比(小於3dB)的頻寬有14% ,天線增益在頻寬內約有8~10dBic的圓極化增益,達成提高天線的增益與頻寬的目的。上述天線設計之模擬與量測皆有一致的結果,證實本論文所提出之天線設計為一可行的方法。Abstract This thesis presents a novel EBG-backed circularly polarized corner- truncated -square aperture antenna, the structure of the antenna has three layers. The basic concept of design is using a microstrip line fed probe on the first layer to excite a square corner -truncated aperture on second layer , and mushroom EBG cells are used as backed-cover inside the aperture, the purpose of putting EBG cells is letting antenna become to uni-directional radiation . It is useful for applications of communicating connection. In this thesis, the proposed EBG-backed circularly polarized corner- truncated square aperture antenna is designed at X-band frequency , and we use FR4 substrate to implement our design . The antenna’s shape is a square whose edge is 30 mm . From the measurement results we know the return loss bandwidth is 9% and the 3 dB axial ratio bandwidth is about 8%, and the gain level is around 3~4 dBic .Furthermore ,we design a sequential-rotation -fed 2X2 antenna array and the array ‘s shape is a square whose edge is 52 mm ,The return loss bandwidth is 27% ; The 3 dB axial ratio bandwidth is about 14% ; The gain level is around 8~10 dBic . The purpose of enhancing gain level and bandwidth are achieved. The results of simulation consist with measurements’ and this improve that it is a feasible way for implemented antenna in the thesis.目錄試委員會審定書...................I文摘要...........................II文摘要...........................III錄...............................IV表目錄...........................V 一章 緒論 1.1 研究動機 .....................................1 1.2 論文架構 .....................................2二章 週期性結構的電磁特性與應用 2.1 頻率選擇表面 (Frequency Select Surface - FSS).3 2.2 單平面光子能隙 (Uni-planar Compact Photonic-Bandgap -UC-PBG).5 2.3 電磁能隙 ( Electromagnetic Bandgap - EBG )....9 三章 電磁能隙反射相位特性之探討 3.1 完美導體與完美磁體反射相位特性...........13 3.2 電磁能隙反射相位特性.....................15 3.3 電磁能隙的參數分析 3.3.1 上層方形面的影響.........................17 3.3.2 連通柱半徑的影響.........................18 3.3.3 介電質的影響.............................19 3.3.4 厚度的影響...............................20 四章 電磁能隙反射相位特性與天線的整合應用 4.1 雙偶極天線藉長方型電磁能隙反射板以圓極化形式輻 射….…22 4.2 覆背式長方形電磁能隙圓極化槽孔天線 4.2.1 1X1 天線設計.................................26 4.2.2 2X2 天線設計.................................30五章 覆背式電磁能隙圓極化截角方形槽孔天線 5.1 線性極化方型槽孔天線.....................35 5.2 圓極化截角方形槽孔天線...................38 5.3 天線參數分析 5.3.1 槽孔邊長.................................43 5.3.2 饋入長度.................................45 5.3.3 截角大小.................................47 5.3.4 饋入點平移...............................51 5.4 天線輻射機制探討.........................53 5.5 電磁能隙的設計...........................63 5.6 覆背式電磁能隙圓極化截角方形槽孔天線.....65 5.7 循序式旋轉2X2 天線陣列 5.7.1 循序式旋轉餽入方法介紹...................74 5.7.2 天線陣列設計.............................75 第六章 結論 參考文獻.................................823853232 bytesapplication/pdfen-US電磁能隙圓極化輻射槽孔天線Electromagnetic band-gapcircularly polarized radiationaperture antennathesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/188195/1/ntu-97-R95942072-1.pdf