An ultrawideband antenna with two tunable notched bands is proposed and designed in this paper. This antenna is based on the circular patch antenna and the ultrawideband characteristic has been improved by etching the Ishaped slot on the ground plane. The dual notched bands characteristics of this antenna are also realized through embedding two Cshaped slots on the surface of radiation element. Moreover, in order to meet the actual communication requirements, the tunable characteristics of the dual notched band are obtained by introducing the variable capacitance technique into the Cshaped slots. An antenna test platform is set up. The experimental results of manufactured prototypes are in good agreement with the simulation results. The designed antenna has good omnidirectional radiation characteristics.