背覆平板共平面波導饋入印刷天線之設計

Design of Printed Antenna Fed by Coplanar Waveguide With Backing Plate

呂彥儒(Yen-Ju Lu)

指導教授 ： 許博文

國立臺灣大學/電機資訊學院/電信工程學研究所/博士(2014年)

https://doi.org/10.6342/NTU.2014.01372

摘要

本論文提出背覆不同材質平板之共平面波導饋入印刷天線之設計，探討了印刷天線背覆空氣、導體和電磁能隙結構等三種不同材質時，天線特性的變化。首先探討的是在有及無背板導體時的共平面波導饋入印刷天線之設計，此設計可以在有及無背板導體時工作在相同的頻率而且擁有良好的天線輻射特性，主要是因為所提出的混和式設計在有及無背板導體時天線共振特性的改變已經被考量在內。因此，一個混和式設計可以被使用在無背板導體的無線通訊應用，同時在不更動其設計參數值，此設計也可以被用在需要背板導體時的應用。其次，一個縮小化的混和式設計也被提出和探討。接著，吾人提出一個增加阻抗頻寬的方法，有效地加大了混和式天線設計的阻抗頻寬，同時維持良好的天線輻射特性。
本論文下半部，主要探討背覆電磁能隙結構的共平面波導饋入印刷式槽偶極天線之設計，背覆電磁能隙結構與槽偶極天線之間的交互作用，使得背覆電磁能隙的設計與傳統共平面波導饋入槽偶極天線的設計有著顯著的不同，吾人於本論文詳述其差異並且提出一個完整的天線設計方法。

關鍵字

背覆導體共平面波導 ； 背覆導體槽線 ； 共平面波導 ； 電磁能隙結構 ； 補釘天線 ； 槽孔天線

並列摘要

Designs of printed antenna fed by coplanar waveguide (CPW) with different backing materials are presented in this dissertation. In the first half of this dissertation, hybrid designs of CPW-fed printed antenna with and without back conductor (BC) are presented. The hybrid designs can adapt themselves to the presence or absence of BC. First, the original hybrid design is proposed, analyzed, and designed. When BC is placed, the antenna is a conductor-backed CPW (CBCPW)-fed side plane patch antenna, while when BC is removed, the antenna becomes a CPW-fed slot dipole antenna. The antenna is designed to have the side plane patch and the slot dipole operate at the same frequency, so that it can adapt itself to the presence or absence of BC. In addition, miniaturization and bandwidth enhancement of the hybrid designs are presented, respectively. Compared with the original design, miniaturized design achieves roughly 40% reduction in size and the overlapping impedance bandwidth of the bandwidth-enhanced design is wider, approximately three times of the original design.
In the second half of this dissertation, design of an electromagnetic bandgap (EBG)-backed CPW-fed slot dipole antenna is presented. The antenna is formed by placing a CPW-fed slot dipole on the top of the EBG structure. It is found that the design considerations of the EBG-backed CPW-fed slot dipole are different from those of the conventional CPW-fed slot dipole. This is because the propagation characteristics of the EBG-backed slotline utilized in the EBG-backed design are quite different from those of the slotline for the conventional design. By using the extracted propagation constant of the EBG-backed slotline, a detailed antenna design procedure is presented.

並列關鍵字

Conductor-backed coplanar waveguide (CBCPW) ； conductor-backed slotline (CBS) ； coplanar waveguide (CPW) ； electromagnetic bandgap (EBG) structures ； patch antennas ； slot antennas

參考文獻

[1] C. P. Wen, “Coplanar waveguide: a surface strip transmission line suitable for nonreciprocal gyromagnetic device applications,” IEEE Trans. Microw. Theory Tech., vol. MTT-17, no. 12, pp. 1087–1090, Dec. 1969.

[2] R. N. Simons, Coplanar Waveguide Circuits, Components, and Systems. New York: John Wiley & Sons, 2001.

[5] R. N. Simons and S. R. Taub, “Coplanar waveguide radial line double stub and application to filter circuits,” Electron. Lett., vol. 29, no. 17, pp. 1584–1586, Aug. 1993.

[6] S.-N. Lee, J.-I. Lee, Y.-J. Kim, and J.-G. Yook, “Miniaturized CBCPW bandpass filter based on thin film polyimide on lossy silicon,” IEEE Microw. Wireless Compon. Lett., vol. 16, no. 10, pp. 546–548, Oct. 2006.

[7] M. Nedil, A. Djaiz, and T.A. Denidni, “Ultra-wideband bandpass filter using back-to-back CBCPW-to-CBCPW transition,” Electron. Lett., vol. 44, no. 5, pp. 362–363, Feb. 2008.