Elliptical UWB antenna with quad band notch functionality

In this paper, a quad-band-notch Ultra Wideband (UWB) antenna is presented. The band-notch is achieved by introducing two meander-line slots in elliptical radiation element, a defected ground plane L-shape slot and an inverted U-slot in feed line. Four notches are achieved centered at frequencies WiMAX 3.5 GHz, IEEE 802.11a/n 5.2 GHz and 5.8 GHz and downlink X-band 7.4 GHz. The substrate employed is low-loss Rogers 5880. Measured results indicate that the proposed design not only supports UWB bandwidth requirements but also rejects four narrow bands to avoid possible interference with existing communication systems. Moreover, the proposed antenna has relatively omni directional radiation patterns in passbands.