The microstrip patch antenna is now very famous due to its compact size, good gain and directivity bandwidth is mostly not very good in microstrip patch antenna but in this paper bandwidth of the antenna is very high, satellite communication there is a need of very compact antenna. This paper presents the designs of compact C-band antenna for communication at 4GHz.Antenna is Rectangular Microstrip Patch Antenna(RMPA),basic property of the antenna like simulated design, return loss, directivity, radiation pattern and bandwidth are discussed.