For solving the problem of band overlap between the ultra-wideband(UWB) communication and existing civil communication,a new type of coplanar waveguide(CPW) fed UWB antenna with three-stop-band characteristics is proposed in this paper.The essence of the prototype of proposed UWB antenna is a dipole antenna;therefore it has good omni-directional characteristics.Three-stop-band is obtained by embedding 3-step open circuit stubs and a step Impedance resonator-defected ground structure(SIR-DGS) in the ground p...