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A compact ultrawideband (UWB) monopole antenna with nested U-shaped slots in the radiating patch for the 3.4/5.5 GHz dual band-notched characteristics is presented. The antenna has a rectangular radiating patch with a staircase structure symmetrically in the bottom of it and fed by a 50-Ώ microstrip transmission line. By removing two nested U-shaped slots in the radiating patch, dual band-notched properties in the WiMAX/WLAN bands are achieved. The proposed antenna is effectively simulated and designed providing broadband impedance matching, appropriate gain and stable radiation pattern characteristics. A UWB and a single band-notched UWB antenna are also provided for the reference.