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A new design of slot antenna by CPW-fed is proposed for ultra-wideband (UWB) applications. The proposed antenna consists of a CPW-fed, and a pair of symmetry curved radiating slot. Using tapered slot forms obtain the bandwidth from 3 GHz to 20 GHz over entire UWB spectrum. The proposed antenna could cover simulated and measured results show that new design CPW-fed UWB slot antenna keeps acceptable patterns and gains. Detail design and experiment are showed and discussed in this paper.