Microstrip antennas have many applications in various communicational systems. To meet the requirement of miniaturization of the carry - home equipments, a folded compact microstrip antenna was presented. Based on the curve circuit theory, a new design of a microstrip antenn vas, described. The new design folds the regular microstrip antenna, so that the dimension of the antenna reduced more than 60% compared with the conventional microstrip antenna. The configuration of the antenna is simple and easy to fabricate. Details of the proposed antenna design and simulation results were presented and discussed. The simulation results show the validity of the design.