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International Journal of Antennas and Propagation
Volume 2014 (2014), Article ID 769816, 7 pages
Research Article

Rectangular Ring Antenna Excited by Circular Disc Monopole for WiMAX System

1Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
2School of Information and Telecommunication Engineering, Tokai University, Kanagawa 259-1292, Japan
3Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Kuala Lumpur 54100, Malaysia

Received 13 July 2014; Accepted 29 October 2014; Published 13 November 2014

Academic Editor: Giampiero Lovat

Copyright © 2014 Souphanna Vongsack 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.


This research presents a rectangular ring antenna excited by a circular disc monopole (CDM) mounted in front of a square reflector. The proposed antenna is designed to cover a frequency range of 2.300–5.825 GHz and thereby is suitable for WiMAX applications. Multiple parametric studies were carried out using the CST Microwave Studio simulation program. A prototype antenna was fabricated and experimented. The measurements were taken and compared with the simulation results, which indicates good agreement between both results. The prototype antenna produces an impedance bandwidth ( < −10 dB) that covers the WiMAX frequency range and a constant unidirectional radiation pattern ( and ). The minimum and maximum gains are 3.7 and 8.7 dBi, respectively. The proposed antenna is of compact size and has good unidirectional radiation performance. Thus, it is very suitable for a multitude of WiMAX applications.