In this paper, Moon shape microstrip patch antenna with stair case ground is presented. This antenna provides triple band that can be used for RADAR/SATELLITE/WLAN applications. The antenna is simulated using Ansys Soft HFSS simulator. The size of the antenna is 40mm45mm1.5mm.The antenna is printed on FR4 substrate material which has the dielectric loss tangent of 0.02 and the permittivity of 4.4. CPW feeding technique is used to feed this antenna. Stair case ground is used in this design of the antenna to improve its performance.