Abstract: A design of a compact printed microstrip G-shaped monopole antenna is proposed covering a frequency range of wireless local area network (WLAN) and the World wide Interoperability for Microwave Access (Wi-MAX). The antenna is simulated and its performance is analyzed by measuring various antenna parameters such as bandwidth, directivity, gain, radiation pattern and return loss. The antenna is constructed of a Flame Retardant 4 (FR4) dielectric substrate. The overall dimension of the radiating patch is46251.6?mm?^3. The tri band performance can be achived by tuning the length and width of the resonating patch. The antenna has a G-shaped resonating element which is designed for the three resonance frequencies at 2.4 GHZ, 4.5 GHz and 6.45GHz. IE3D method of moments based simulation software is used for design and analysis of the antenna.

Keywords: Monopole Antenna, Microstrip G-Shaped antenna, Tri-Band, Bandwidth, Radiation Pattern.