A novel design of a simple microstrip‐fed monopole antenna well suited to wireless local area network (WLAN)/worldwide interoperability for microwave access (WiMAX) application for triple‐band operation is proposed in this article. The proposed antenna consists of one branch strip, two hook‐shaped strips, an asymmetrical ground plane, and a rectangular slit in the ground plane. Through the proper selection of the dimensions as well as arrangement of the strips, desired resonant modes excited at 2.35/3.65/5.375 GHz with a less than −10‐dB input impedance frequency response can be achieved. Prototypes of the proposed antenna were fabricated and experimentally measured, and an acceptable agreement between the measurement and simulation results was achieved. The numerical and experimental results demonstrate that the proposed antenna satisfies the −10‐dB impedance bandwidth requirement while covering the WLAN and WiMAX bands simultaneously. Meanwhile, the 2D radiation patterns and 3D gain performance of the antenna in the operation bands were also observed and discussed. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1838–1846, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26963

In this article, a novel design of a simple rectangular ring with open‐ended monopole antenna that is well suited to wireless local area network (WLAN) applications for dual‐band operations is proposed.The proposed antenna consists of an open‐ended rectangular ring, vertical strip, and a rectangular slit in the ground plane. Prototypes of the proposed antenna were fabricated and measured. This proposed monopole antenna had −10 dB impedance bandwidths of about 400 and 1600 MHz (2.1625–2.5625 GHz and 5.025–6.625 GHz), respectively, or about 16.93 and 27.47%, covering the required bandwidths of 2.4/5.2/5.8 GHz WLAN standards. Meanwhile, the two‐dimensional (2D) radiation patterns and 3D gain performance of the antenna in the operation bands were also observed and discussed. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:619–624, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27348