A coplanar waveguide (CPW) fed UWB antenna with triplenotched band is designed. The size of the antenna is 30 mm×30 mm×1.8 mm and printed on FR4 dielectric substrate with a dielectric constant of 4.4. The triplenotched characteristics are realized by loading "dumbbell type" slot on the radiation patch and loading asymmetrical Ushaped slot on the fed line as well as loading rectangular cracks on the coplanar ground. After simulating, analyzing and optimizing by the high frequency simulation software HFSS, the proposed antenna exhibits an impedance bandwidth over an ultrawide band frequency range from 2.20 GHz to 11.82 GHz. In addition to the notch characteristics at 3.52~3.80 GHz,4.60~5.60 GHz and 7.62~8.30 GHz, the return loss is great than -10 dB, the return loss of other bands is less than -10 dB. It can avoid interference from the WiMAX, WLAN and X band signals respectively, and achieve good farfield radiation characteristics in the passband of UWB.