A compact microstrip patch antenna is presented in this paper in order to reduce the surface area of the normal rectangular microstrip patch .The reduction in size were made by meaning of shorting the normal rectangular patch at the middle of its length using shorting posts .A comparison between the normal and shorted patches antenna shows that the shorted microstrip patch has similar properties such that return loss, input impedance, bandwidth and radiation pattern as the normal microstrip patch antenna. The investigation made at resonance frequency 1.691GHz using an evaluation version of Sonnet 12.53 Software .