Recently, the demand for wireless devices that support multiband frequency has increased. The integration of such technology in\nmobile communication system has led to a great demand in developing small size antenna with multiband operation, which is\nable to operate in the required system. In this paper, a novel type planar inverted F antenna (PIFA) with gridded ground plane\nstructure and overlapping cells is presented. By controlling the overlapping size, we improve the characteristics of the proposed\nantenna. This antenna is developed to achieve multiband operation with small size and good performance. The particle swarm\noptimization (PSO) is employed to a PIFA antenna to get rid of the limitations of single band operation by searching the optimal\nlocalization and length of linear slots on the ground plane to give triband operation. This PIFA antenna can be integrated to operate\nfor several mobile applications as Bluetooth/WLAN,WIMAX, and 4G (UMTS2100, LTE). The optimized antenna is simulated by\nboth Ansoft HFSS and computer simulation technology microwave studio (CSTMWS) in terms of
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