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International Journal of Antennas and Propagation
Volume 2014, Article ID 951968, 6 pages
Research Article

A CPW-Fed Rectangular Ring Monopole Antenna for WLAN Applications

Department of Computer and Radio Communication Engineering, Korea University, 1-5 Ka Anam-Dong, Seongbuk-gu, Seoul 136-701, Republic of Korea

Received 14 April 2014; Accepted 5 June 2014; Published 23 June 2014

Academic Editor: Nemai Karmakar

Copyright © 2014 Sangjin Jo 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.


We present a simple coplanar waveguide- (CPW-) fed rectangular ring monopole antenna designed for dual-band wireless local area network (WLAN) applications. The antenna is based on a simple structure composed of a CPW feed line and a rectangular ring. Dual-band WLAN operation can be achieved by controlling the distance between the rectangular ring and the ground plane of the CPW feed line, as well as the horizontal vertical lengths of the rectangular ring. Simulated and measured data show that the antenna has a compact size of  mm2, an impedance bandwidths of 2.21–2.70 GHz and 5.04–6.03 GHz, and a reflection coefficient of less than −10 dB. The antenna also exhibits an almost omnidirectional radiation pattern. This simple compact antenna with favorable frequency characteristics therefore is attractive for applications in dual-band WLAN.