A micro-strip patch antenna is designed and simulated in the HFSS software. The proposed antenna can be embedded in mobile devices for the purposes of mobile WiMAX operations due to its very small size and weight. This antenna has a very good gain, directivity, return loss and VSWR. It can be used in the mobile devices for WiMAX applications. In modified antenna, the authors are reducing losses beyond the resonant frequency. In future work, they will carried out for antennas with feeding techniques.