J. of Electromagn. Waves and Appl., Vol. 26, 904–913, 2012 A NOVEL MICROSTRIP-FED MONOPOLE ANTENNA FOR WLAN/WIMAX APPLICATIONS M. B. Bicer and A. Akdagli * Department of Electrical and Electronics Engineering, Faculty of Engineering, Mersin University, 33343, Ciftlikkoy, Mersin, Turkey Abstract—A new microstrip-fed printed monopole antenna which is simple in design and compact in size is presented for simultaneously satisfying wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) bands. A simulation software package, CST Microwave Studio, has been used to model the proposed antenna, whose electrical characteristics and radiation performance are thoroughly analyzed as well. The proposed antenna, with small size of 28 × 51 mm 2 on Rogers RT/Duroid R  5870 substrate with permittivity 2.33, was designed and fabricated. It was demonstrated that the measured 10 dB bandwidth for return loss is from 1.76 to 2.59 GHz, 3.44 to 3.89 GHz and 5.18 to 5.99 GHz, covering all the 2.4/5.2/5.8 GHz WLAN and 2.5/3.5/5.5 GHz WiMAX bands. 1. INTRODUCTION Due to attractive features such as small size, planar configuration, low cost, conformal shaping, simplicity of manufacturing and easy integration to solid state devices, microstrip antennas have been widely implemented in many applications such as personal communication systems (PCS), mobile satellite communications (MSC), direct broadcast satellite (DBS), wireless local area networks (WLAN) and other wireless and mobile devices that demand small sized antennas [1– 4]. Most of the studies for patch antenna presented in the literature have concentrated on rectangular, triangular and circular microstrip antennas because of easy in analysis and design. However, the size of regularly shaped microstrip antennas is relatively large for ultra- high frequency (UHF) band applications. Because of the need for a Received 19 February 2012, Accepted 18 March 2012, Scheduled 25 March 2012 * Corresponding author: Ali Akdagli (akdagli@mersin.edu.tr).