Abstract: The spectrum overlapping between ultra wideband system and many narrowband system results in the potential interference in signals. For this problem, the paper proposed a compact ultra wideband antenna with dual band-notched characteristic. The antenna consists of a circular patch fed by a 50W microstrip line. Compared with conventional ground plane, the ground plane is truncated to improve the overall bandwidth. The H-shaped slot is etched on the radiator to introduce the dual band-notch function and embedding resonance circuit is introduced to enlarge the depth of the band-notched characteristic and the width of stop band, so the antenna shows better band-notched characteristic than other dual band-notched antennas at the same frequency bands. The simulation and test results indicate that the antenna achieves band-notched function at 3.1～4.2GHz and 5.0 ～6.6GHz to effectively avoid interference from the signal of WiMAX and WLAN. At the same time, except for the two notched bands, it has a good impedance matching over a bandwidth of 2.8 to 10.7GHz with　reasonable radiation patterns. The antenna has a compact size of 34mm*26mm*1.6mm.