A CPW-Fed ultrawideband antenna with dual notched bands

A coplanar waveguide fed (CPW-Fed) ultrawideband (UWB) antenna with dual band-notched characteristics is proposed and implemented. The proposed antenna consists of part of a circular patch and two modified ground planes. Two symmetrical slots are etched from the ground plane to implement the notched band at 5.5 GHz. The other notched band at 3.5 GHz is obtained by etching a split ring slot in the radiator. The simulation and measurement show that the proposed antenna achieves an impedance bandwidth of 3.1–10.6 GHz with VSWR ≪ 2, except the bandwidth of 3.2–3.8 GHz and 4.8–6.2 GHz. A nearly omnidirectional radiation pattern and stable gain with variation less than 3 dB are also obtained except in the notched bands.