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A simple and compact microstrip-fed Ultra WideBand (UWB) printed monopole antenna with band-notched characteristic is proposed in this paper. The antenna is composed of a square ring with a small strip bar, so that the antenna occupies about 7.69 GHz bandwidth covering 3.11～10.8 GHz with expected band rejection from 5.12 GHz to 5.87 GHz. A quasi-omnidirectional and quasi-symmetrical radiation pattern is also obtained. This kind of band-notched UWB antenna requires no external filters and thus greatly simplifies the system design of UWB wireless communication.