This paper proposes a multiband microstrip patch antenna covers a multiple operating frequency bands PCS/DCS/LTE/WIFI. The overall dimension of the proposed antenna is 65×67.05mm 2 printed on an FR4 substrate, having 1.6 mm as thickness with a relative dielectric permittivity of 4.4 and 0.025 for loss tangent. The proposed antenna was study and validated by using electromagnetic software's CST-MW. Three bands (1.811-1.828 GHz, 2.631-2.749 GHz and 4.554-5.457 GHz) are achieved by inserting a slot on the top patch and ground. The radiation pattern has acceptable response with low cross polarization at both E-plane and H-plane.