M Microstrip antenna have superiority, there are compact shape, small dimention, light, easy to fabricate, easy to connect, and integrate with another electronic device.In this final assignment, have designed microstrip antenna that can work in threefrequencies (triband) , which can be use for WiMAX standart. The WiMAX frequencies that are chosen of this final assignment are 2,3 GHz (2,3-2,4 GHz), 3,4 GHz (3,410-3,4975 GHz), and 5,8 GHz (5,725-5850 GHz).The antenna which is yielded , working at frequency 2,3 GHz (2,2935-2,4316GHz) with return loss value -11,148 dB and with VSWR value 1,7589, at frequency 3,4 GHz (3,3535-3,4459 GHz) with return loss value -19,913 dB and with VSWR value 1,2161, and then working at frequency 5,8 GHz (5,4259-5,9843 GHz) with return loss value -12,244 dB and with VSWR value 1,6463.