In this paper, the authors present the dual U-shape microstrip patch antenna feed by the transmission line. The proposed antenna is designed by FR4 substrate and ground plane with an area 40x47mm. This antenna is designed for WiMAX applications and wireless communication system. The two slots and one bridge elements have been applied to generate the three frequencies bands 2.44GHz, 3.26 GHz and 5.38GHz to be used in WiMAX technology. Basically WiMAX has three allocated frequency bands called low band, middle band and high band. One bridge element has been used to shift the frequencies in proper way.