A compact fractal UWB antenna with reconfigurable band notch functions

In this paper, a compact reconfigurable single/dual notch band ultrawideband (UWB) antenna with triple notch band characteristics is presented for portable UWB applications. The desired compactness and wideband is achieved using fractals in antenna design. It has the compact dimensions of 24.5 mm × 20 mm. The single/dual notch band reconfigurability is demonstrated in WiMAX band as well as in X-band using two p-i-n diodes for efficient utilization of UWB bands in case of no interference scenarios. The band rejections are obtained by introducing two C-shaped slots in the fractal monopole, whereas band rejection in WLAN band is achieved by placing two C-shaped single split ring resonator on either sides of feed line. In addition, the time-domain characteristic of antenna is also evaluated in terms of fidelity factor, which is more than 0.71. These results illustrates that the presented antenna is appropriate candidate for portable UWB applications.