Modified H-shaped array antennas are proposed to achieve high gain and good impedance matching for WiMAX applications. Here a 32 H-shaped microstrip array antenna is designed. To reduce the return loss and for good impedance matching, the 50ohm impedance transformer is used. By using H-shaped slot antenna, an air bridge can be avoided in design as well as the complexity of design can be reduced. The 180 degree phase shifters are organized in H-shaped antenna. It gives 7.77dB gain and 11.97dB directivity.