The utility model relates to an ultra wideband antenna possessing double trapped wave characteristics, comprising a medium plate, a radiation unit, a ground plate and a microstrip feed line. The ground plate, radiation unit, and microstrip feed line are printed on the upper and lower sides of the medium plate; the surface of the radiation unit is etched with a U-shaped slit, a C-shaped slit, and three pairs of slits with symmetrical bottom edges; the superior angle of the ground plate on the lower side of the medium plate is symmetrically etched with two rectangular notches; the U-shaped slit and the C-shaped slit form two trapped wave frequency ranges to respectively correspond with 3.3 GHz-3.6 GHz and 5.15 GHz-5.825GHz; the two symmetrical rectangular notches on the upper parts of the ground plate and three pairs of slits with unequal lengths on the bottom of the radiation unit are used for regulating the band width of a whole wide frequency antenna. The ultra-wideband antenna has a work bandwidth frequency range covering 3.01-11.65GHz, can well restrain interference signals in an ultra wideband work frequency range and is used for ultra wideband wireless communication.