Ultrawideband printed elliptical monopole antenna with four band-notch characteristics

In this paper, a compact ultrawideband (UWB) elliptical monopole antenna with four band-notched characteristics is proposed. An optimized half elliptical slit is inserted into the ground plane to improve the impedance bandwidth. The proposed antenna can be achieving separately four sharp notches at frequencies 3.5 GHz, 5.5 GHz, 9.GHz and 12.5 GHz. The simulation is performed using the finite-difference time-domain technique. The proposed antenna has an acceptable omnidirectional radiation pattern. The results prove that this kind of antenna not only satisfies all UWB but also rejects the limited bands in order to avoid possible interference with existing wireless networks.