A simple microstrip patch antenna consists of metallic patch and ground between a dielectric medium called the substrate. Microstrip patch antennas are widely used in communication, especially in military and civil applications. The printed antennas have played a major role in development of antenna at different frequency. The proposed antenna is done on fr4 (frame sensitive) substrate with dielectric permittivity epsilon o and the thickness 'h' will provide with good omnidirectional radiation pattern. It has a advantages in simple design, Compact in size and easy in fabrication. Design and simulation of patch antenna using HFSS Software. Design of a circular micro-strip patch antenna for 2.4 GHz application and study s-parameter, Gain and field animations