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A compact dual band-notch ultra-wideband polygon slot antenna with two parasitic slits is presented. The antenna is as small as 16 ?? 25 ?? 0.8 mm. The proposed antenna yields an impedance bandwidth of 3.1-10.6 GHz with VSWR < 2, except for the bandwidths of 3.33.9 GHz for WiMAX and 5-6 GHz for WLAN. The antenna has been successfully simulated, designed and measured, showing good impedance matching, stable gain and near omnidirectional radiation patterns.