A simple and compact ultra wideband(UWB) printed monopole antenna with band-notched performance is proposed in this paper.The antenna is partially grounded so that the Q value is depressed and the impedance bandwidth is broadened.A small strip bar is loaded on each arm of the similar U-shaped radiator.The impedance bandwidth of the antenna overlap with IEEE 802.11a is rejected consequently.The geometry parameters of the antenna are investigated and optimized with HFSS.The measured bandwidth of the proposed antenna occupies about 7.89 GHz covering from 3.05 GHz to 10.94 GHz with expected notched band from 4.96 GHz to 5.98 GHz.A quasi-omnidirectional and quasi-symmetrical radiation pattern in the whole band is also obtained.As a result,a UWB wireless communication system can be simplified with the band-notched UWB antenna presented.
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