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International Journal of Antennas and Propagation
Volume 2015, Article ID 165270, 7 pages
Research Article

A CPW-Fed Monopole Antenna with Double Rectangular Rings and Vertical Slots in the Ground Plane for WLAN/WiMAX Applications

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

Received 15 April 2015; Revised 15 June 2015; Accepted 15 June 2015

Academic Editor: Junping Geng

Copyright © 2015 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.


A compact triple-band monopole antenna consisting of double rectangular rings and vertical slots cut into the ground is proposed for WLAN and WiMAX operations. The antenna has a compact size of 27.1 × 38.8 × 1.6 mm3, with simulated and measured impedance bandwidths of 2.37~2.81, 3.21~3.82, and 4.61~6.34 GHz with a reflection coefficient of less than −10 dB. The antenna also exhibits an almost omnidirectional radiation pattern and stable gain levels in the triple bands. The characteristics of the proposed antenna have been investigated using the numerical simulations and experiments.