Antenna is part of a transmitting or receiving system that is designed to radiate or receive electromagnetic waves. Microstrip antenna is only one such type of antenna. This paper describes design of compact microstrip patch antenna for dual frequency operation. In this paper rectangular patch with probe feed technique is used. In this paper, the authors describing how compact microstrip antenna can be designed by introducing shorting pin technique and gives a better understanding of design parameters of an antenna and their effect on return losses, and resonant frequency. Finally simulation is done using design software IE3D.