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International Journal of Antennas and Propagation
Volume 2014 (2014), Article ID 980120, 6 pages
Research Article

A Wide-Bandwidth Monopolar Patch Antenna with Dual-Ring Couplers

1Department of Electronics and Communication Engineering, Sun Yat-Sen University, Guangzhou 510006, China
2SYSU-CMU Shunde International Joint Research Institute, Shunde 528300, China

Received 1 April 2014; Revised 15 June 2014; Accepted 17 June 2014; Published 29 June 2014

Academic Editor: Tat Soon Yeo

Copyright © 2014 Yuanyuan Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A new center-fed circular patch antenna with two coupled annular rings is presented. When the two annular rings are coupled properly, a wide band from 5.45 GHz to 7.16 GHz is achieved with a monopole-like radiation pattern. Measured results show that the antenna with a low profile of 0.027 wavelengths (at 5.45 GHz) has a bandwidth of 27.1% and a measured maximum gain of 6 dBi. The radiation pattern is omnidirectional and remains relatively stable within the operating band.