Abstract: In wireless communication systems, in order to overcome the mutual interference between systems, an UWB monopole antenna with dual band notched characteristic is proposed using band suppressed technology. Firstly, a step structure radiation patch which is fed by CPW is designed to obtain the voltage standing wave ratio (VSWR) less than 2 in frequency band 2. 9 ~12GHZ. Secondly, C shape and pour U shape resonant slots are introduced separately on the radiation patch to obtain band notched characteristic. After optimization, the simulation results show that the VSWR of the antenna has greater than 2 value in 3. 3 ~3. 9GHz and 5. 1 ~ 5. 9GHz frequency band. Finally, the antenna was fabricated and tested. The simulation and measurement result show that they matched very well and demonstrated that the frequency band sup pressed function of the antenna is well achieved.