可應用於三個緊鄰單極天線系統之解耦合電路設計：使用特徵模態分析

Decoupling network design for a closely-spaced three monopole antenna system: An eigenmode approach

徐俊芳(Chun-Fang Shu)

指導教授 ： 吳霖堃

國立交通大學/電機學院/電機學院電信學程/碩士(2016年)

摘要

近年來，人類對於無線通訊速度及品質的需求越來越高，多輸入多輸出之天線系統被視為是一個可以滿足需求之解決方案。但是在多天線彼此距離縮短時，增強的耦合會影響傳輸，如何壓抑耦合並維持天線匹配是一個必須解決的問題。
我們利用天線特徵模態具有正交且不會互相干擾之特性，於本篇論文中，為一對稱三埠天線系統量身訂造一可激發天線特徵模態之饋入網路。若此饋入網路可分別激發天線所擁有之特徵模態，可期待輸入間將不會互相干擾，耦合因而得以降低，我們針對一個三單極天線系統進行實作設計以驗證以上概念。

關鍵字

單極天線 ； 解耦合電路 ； 特徵模態

並列摘要

In recent years, there is a rise on the demand of speed and quality in wireless communication systems. MIMO antenna systems is considered as a possible candidate to improve the above demands.
However, when the distance between multiple antenna is limited, the coupling between antenna elements will be severe and can deteriorate the matching of the antenna system. The coupling of MIMO antenna system is thus needed to be suppressed for practical applications.
If one can excite the eigenmode of a multiple antenna system, one can expect the mode will not interfere with each other due to their orthogonal nature, This concept is used in this thesis, and a decoupling network for a three symmetric antenna system is proposed. By properly design the network to excite each individual mode of the antenna system, the interference between input is expected to be suppressed. This concept is experimentally verified on a three printed monopole antenna system.

並列關鍵字

monopole antenna ； Decoupling network ； eigenmode

參考文獻

[2] Y.Xiao, "IEEE 802.11 n:enhancements for higher throughput in wireless LANs, "IEEE Trans.Wireless Commun., vol.12,no,pp.82-91,2005.

[3] J. C. Coetzee and Y. Yu, "Design of decoupling networks for circulant symmetric antenna arrays," IEEE Antennas Wireless Propag. Lett., vol. 8, pp. 291-294, 2009.

[4] D. Sievenpiper, L. Zhang, R. F. Broas, N. G. Alexopolous, and E. Yablonovitch, "High-impedance electromagnetic surfaces with a forbidden frequency band," IEEE Trans. Microw. Theory Tech., vol. 47, pp. 2059-2074, 1999.

[5] L. K. Yeung and Y. E. Wang, "Mode-based beamforming arrays for miniaturized platforms," IEEE Trans. Microw. Theory Tech., vol. 57, pp. 45-52, 2009.

[6] C. Volmer, J. Weber, R. Stephan, K. Blau, and M. A. Hein, "An eigen-analysis of compact antenna arrays and its application to port decoupling," IEEE Trans. Antennas Propag., vol. 56, pp. 360-370, 2008.