Dual band notched fractal ultra-wideband antenna

A dual frequency notched ultra-wideband (UWB) fractal printed antenna is presented and analyzed in detail. By introducing Sierpinski carpet fractal, the size of the antenna is reduced significantly and impedance bandwidth is improved. Two open-ended quarter wavelength slots are etched on the ground plane to create the first notched band in 3.3 - 3.7 GHz for WiMAX system. In addition, two half-wavelength U shape slots are cut in the ground plane to generate the second notch band in 5.15-5.825 GHz for IEEE802.11a and HIPERLAN/2. Several properties of the antenna such as impedance bandwidth, frequency notched characteristics, radiation patterns and gain, have been simulated. Two sharp frequency notched bands are achieved, and relatively stable, omnidirectional radiation performance over the entire frequency range has also been obtained.