Due to well known characteristic microstrip antenna have been used successfully in much application. This paper presents the design of antenna operating in ISM band at 2.4GHz. The designed square patch antenna is dual polarized with two rectangle shaped slot inserted on the patch. The FR4 dielectric material is used for the antenna consist of dual probe feed with ground plane. HFSS software is used for the simulation which shows the result for isolation as 28dB, antenna gain of 5.96dB and bandwidth 222MHz.