覆背式電磁能隙圓極化截角方形槽孔天線

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。

關鍵字

電磁能隙；圓極化輻射；槽孔天線

並列摘要

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.

並列關鍵字

Electromagnetic band-gap ； circularly polarized radiation ； aperture antenna

參考文獻

[1] Y.E. Erdemli, K. Sertel, R.A. Gilbert, D.E. Wright ,and JL Volakis, “Frequency-Selective Surfaces to Enhance Performance of Broad-Band Reconfigurable Arrays”, IEEE Trans. Antennas Propag , Vol. 50, No. 12, p.p. 1716 – 1724, Dec. 2002

[2] F.R. Yang, K.P. Ma, Y. Qian ,and T. Itoh, “A Uniplanar Compact Photonic-Bandgap (UC-PBG) Structure and Its Applications for Microwave Circuits ”, IEEE Trans. Microwave Theory Tech , Vol. 47, No. 8, p.p. 1509-1514, Aug. 1999

[3] R. Coccioli, F.R. Yang, K.P. Ma ,and T. Itoh, “ Aperture-Coupled Patch Antenna on

UC-PBG Substrate ”, IEEE Trans. Microwave Theory Tech , Vol. 47, No. 11,

p.p.2123-2130 , Aug.1999

國際替代計量

覆背式電磁能隙圓極化截角方形槽孔天線

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