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A compact quad-band circular slot antenna with two T-patch is present. The prototype of the proposed antenna is designed to satisfy specific bandwidth specifications of current communication systems, including the global positioning system for communication (GPS; 1.575-1.625GHz) the wireless local area network (WLAN; 2.4-2.485 GHz, 5.15-5.35 GHz and 5.725-5.825 GHz), and the Microwave Access Network (WIMAX; 3.3-3.6 GHz). The proposed antenna has compact size of 57 mm × 46 mm × 1.636 mm. The antenna has been successfully simulated, designed and measured, and the results shown that the antenna has good impedance match, stable gain and near omnidirectional radiation patterns.