覆背式電磁能隙圓極化槽孔天線

EBG-Backed Circularly Polarized Aperture Antennas

林展裕(Chan-Yu Lin)

指導教授 ： 林怡成

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2007年)

https://doi.org/10.6342/NTU.2007.10184

摘要

本論文提出ㄧ種新穎的覆背式電磁能隙圓極化槽孔天線，其基本原理是以第一層微帶線開路線段為饋入裝置,激發第二層的圓形槽孔，而此圓形槽孔內部則充滿電磁能隙單元，我們乃設計此電磁能隙單元使其兩個正交方向反射相位相差90度，便可以達成圓極化天線的目的。本論文將所提出的覆背式電磁能隙圓極化槽孔天線分別設計在X頻帶及V頻帶上。在X頻帶上的設計,我們所採用的介質為FR4，天線尺寸大小為30公釐乘以30公釐，天線的返回損失十分寬頻，然而其圓極化軸長比(小於3dB以內)的頻寬只有500 MHz左右，天線增益在頻寬內約有5dBic的增益。另外，我們也利用低溫共燒陶瓷製程實現毫米波V頻帶的設計，並且利用循序式旋轉的陣列方式增加其圓極化軸長比之頻寬及天線增益。本論文所設計的LTCC 2x2陣列天線尺寸為6公釐乘以12公釐，其圓極化軸長比(小於3dB以內)的頻寬為56 GHz到63.5 GHz，而天線的增益在規格頻帶59GHz到62GHz之間皆能夠達到9dBic的高增益目標。

關鍵字

電磁能隙 ； 槽孔天線 ； 圓極化天線 ； 循序式旋轉

並列摘要

This thesis proposed a novel EBG-backed circularly polarized aperture antenna. The basic principle of this antenna is that it uses the open stub of the microstrip of the first layer as the energy source to excite the circular aperture with embedded EBG structure of the second layer. We make the reflection phase differences of orthogonal direction of EBG be 90 deg to achieve circularly polarized antenna goal.
The proposed EBG-backed circularly polarized aperture antenna is designed to operate in X- and V-band frequencies. The X-band antenna is fabricated with dimension of 30mm square on the FR-4 substrate. The bandwidth of the axial ratio(less than 3dB) is about 500MHz and the gain is 5dBic for the designed X-band antenna. Furthermore, we use Low temperature co-fired ceramic process to implement our V-band design and adopt sequential rotate array method to enhance axial ratio bandwidth and antenna gain. The size of 2 by 2 array designed in this thesis is 6mm by 12mm.The axial ratio bandwidth (less than 3dB) is 56GHz to 63.5GHz and the gain performance is higher than 9dBic within spec. frequency 59GHz to 62GHz.

並列關鍵字

EBG ； Aperture Antenna ； circularly polarized antenna ； sequential ratoata

參考文獻

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[2] F. Yang and Y. Rahmat-Samii, “Polarization dependent electromagnetic band-gap surfaces: characterization, designs, and applications,” IEEE Int. Symp. Antennas Propaga. Society , vol. 3, pp. 339-342 vol.3, June 2003.

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