Design of planar inverted-F antennas (PIFA) for multiband wireless applications

A small three bands printed inverted-F antenna with independently controlling the resonant frequency is presented. The proposed antenna consists of two arms supported by shorting walls fed by 50 Omega microstrip transmission line and a ground plane. The antenna occupied a compact size of 26 times 25.6 times 3.75 mm³. The main radiated patch injected with slot and another arm to generate and control the three resonant frequencies to cover 2.4, 3.7 and 5.2 GHz wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX). The simulated and measured results show that the antenna achieves a gain of 2, 3 and 5 dBi respectively and radiation efficiency of 50%, 60% and 85% for the three bands respectively. The simulated and measured result for the return loss is in good agreements.