Microstrip antennas have numerous advantages such as small size, low fabrication cost, light-weight and can be easily installed in the systems and it finds its applications in various systems like aircraft, satellite and spacecraft. But it has drawback of narrow bandwidth. To overcome this drawback, microstrip antennas with defected ground structure can be used. In this paper, a microstrip patch antenna with Defected Ground Structure (DGS) and its effect has been discussed. The dual band is achieved in this design and the antenna operates at 4.9 and 7.6GHz.