Microstrip patch antenna is radio antenna with low profile. It consists of active patch of metal with ground plane (patch of metal).The following paper describes the dual band G shape microstrip patch antenna for WLAN application. The authors simulated this antenna by using Ansoft HFSS. The proposed antenna is G shape microstrip patch antenna with non-conductor back. This antenna is fed by coaxial cable feed. Measured value of bandwidth at -10 db is 50 MHz for lower band i.e. 2.42 GHz and 72 MHz for upper band i.e. 5.2 GHz.