A practical coplanar waveguide (CPW) fed ultra-wideband (UWB) antenna with reconfigurable dual band-notched characteristics is proposed in this paper. A cup-shaped branch is added to the grounding plate and a step impedance resonator (SIR) added to the microstrip line, which realize notch characteristics in 5.1~5.9 GHz and 7~7.8 GHz bands and realize double notch function with good radiation direction characteristics. The antenna bandwidth is extended by using CPW feeding, ranging from 3 GHz to 16 GHz with the relative bandwidth of 137%. The notch band reconfigurability is realized by integrating three switches into the cup-shaped branch and SIR. In addition, the proposed antenna has a compact size of 24 mm × 32 mm × 1.5 mm and can provide omnidirectional radiation pattern, which is suitable for UWB communication applications.
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