The triple band MIMO antenna composed of two unbalanced fed ultra low profile inverted L antennas with parasitic elements on the rectangular conducting plane is proposed for WiMAX applications of 2.3 GHz to 2.7 GHz, 3.3GHz to 3.8 GHz, and 5.25 GHz to 5.85 GHz. The inverted L parasitic element is located between the inverted L antenna and ground plane. In addition, the rectangular parasitic element is located above the inverted L antenna. The size of antenna is 49 mm by 65 mm by 13.5 mm. The distance between two antennas is 49 mm. The S21 less than −20dB and the correlation coefficient less than 0.002 are satisfied in three frequency bands. In the numerical analysis, the electromagnetic simulator WILP-D based on Method of Moments is used.