Microstripline-fed dual band printed monopole antenna for WLAN/WiMAX/HIPERLAN applications

A dual-band planar printed monopole antenna for wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications are presented. The proposed antenna is designed on inexpensive FR4 substrate having dielectric constant 4.4 and thickness 1.6 mm, which covers WLAN 2.4 GHz (2.4 GHzȓ2.5 GHz), WiMAX 2.5 GHz (2.5 GHzȓ2.69 GHz), WiMAX 3.5 GHz (3.3GHzȓ3.6GHz), HIPERLAN1 5.2 GHz (5.15 GHz-5.35 GHz), and HIPERLAN2 5.8 GHz (5.725 GHzȓ5.825 GHz). The proposed antenna mainly consists of inverted U-shaped strip, inverted L-shaped strip and modified ground plane. The modified ground plane was introduced to enhance the performance of the proposed antenna. It is found that the proposed antenna can meet the demands of WLAN and WiMAX systems by having bandwidth of 1.4 GHz (2.25-3.65 GHz) for the lower band and 2.13 GHz (4.37 GHzȓ6.5 GHz) for the upper band defined by -10dB reflection coefficient. The radiation patterns and gain characteristics are also presented. Due to compact size, the proposed monopole antenna may well work as an internal antenna in a portable device for WLAN/WiMAX operations.