A high selectivity band-notched UWB antenna with controllable notched bandwidths

A CPW-fed ultra-wideband (UWB) antenna with controllable notched bandwidths by using multiple resonant slots, ranging from 5.2GHz to 5.8GHz, is proposed and implemented. The notched band rejection is achieved by the slots etched in the radiator patch, which are coupled together. And the notched bandwidth can be controlled by adjusting the coupling distances and positions of the slots. The simulation and measurement show that the proposed antenna achieves a well-matched broadband impedance of 3.1-10.6 GHz (|S11|<;-10dB), except the rejection bandwidth of 5.2-5.8 GHz in the bands of WLAN (|S11|>;-3dB). The ratio of the 3dB and 10dB notched bandwidth is about 0.75 and high selectivity of the notched band is obtained.