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This paper presents a wideband dual layer rectangular U-Slot patch antenna for WiMAX and WLAN applications. The antenna exhibits wideband characteristics that depend on various parameters such as U-slot dimensions, circular probe-fed patch etc. The characteristics of the proposed antenna are calculated and compared with other designs. The antenna shows 36.2% impedance bandwidth with more than 90% antenna efficiency and is best suited for 2.3/2.5 GHz WiMAX and 2.4 GHz WLAN applications.