In this research work, a compact triple-band antenna for WiMAX, WLAN and X-band applications is presented. The proposed antenna has compact size of 18x21.3mm2. The miniaturization of 52.10% is achieved compared with the conventional antenna. For achieving compactness and multiple frequency operation a square patch is loaded with inverted U-shaped slots and partial ground is used and can resonates at 3.26 GHz, 5.95 GHz and 8.83 GHz with a return loss of -29.15 dB, -43.40 dB, -41.14 dB respectively with highest gain of 2.69 dB. The proposed multiband structure yields good impedance matching, acceptable gain, and wide bandwidth.