Design of triple-band antenna using S-shaped patch fed by cross strip line for WLAN and WiMAX applications

Abstract

This paper presents a simple triple-band S-shaped patch antenna fed by a cross strip line for both WLAN and WiMAX applications. It is operated at the triple bands of 2.4 and 5.2 GHz for WLAN and 3.5 GHz for WiMAX. The antenna, designed on an FR4 substrate with a thickness of 1.6 mm and relative permittivity of 4.4, is fed by a 50-Ω microstrip line, and is of size 25 × 35 mm. The simulated and measured results of |S11|, gains, and radiation patterns are presented. The measured results show that the triple-band antenna achieves a broad operating bandwidth of 2.36-2.54, 3.27-3.69, and 5.16-5.48 GHz for a 10-dB return loss (i.e. |S11|<-10 dB). The gains of the antenna measured at 2.4, 3.5, and 5.2 GHz frequencies are 1.87, 1.95, and 3.82, respectively. The radiation pattern of the antenna is omnidirectional.