UWB antenna with multiple controlled rejection-bands

In this paper, an ultra-wide band (UWB) antenna with multiple band rejections is proposed. The antenna consists of a radiation element that supports radiation in a range from 3.1 to 15 GHz and a ground plane. The antenna is fed by a microstrip line embedded on the back of the ground plane. The microstrip line is designed to have nonuniform width along longitudinal direction by using the inverse scattering theory so as it has band rejections at 5 to 6 GHz and 10.6 to 13 GHz. A fabricated antenna shows that the measurement agrees with the theory very well. The antenna radiates properly in the UWB range except the WLAN range from 5 to 6 GHz and the radiation outside the UWB range is successfully suppressed.