A compact triple wideband-notched UWB antenna

A compact ultra-wideband (UWB) antenna with triple wideband-notched characteristic is presented. The three notched wide bands are respectively obtained by loading U-shape slot, L-shape stubs, and nested semielliptical slots on the ground plane with a rectangular slot and a hexagon patch, which is fed by a coplanar waveguide (CPW). The simulated results show that the antenna achieves the 10dB impedance band from 2.7 to 10.7 GHz in which three notched wide bands of 3.3∼3.8 GHz, 4.75∼5.9 GHz, and 7.25∼8.4 GHz for return loss (RL) less than 10 dB are obtained. The z-direction gains of the antenna at the operating frequencies of 3.1, 6.7, 9 GHz are larger than 2.7, 2, 4.4 dBi, respectively. While the z-direction gains of the typical frequencies of 3.4, 5.2, 7.8 GHz in the three notched bands are −7.5, −6, −9dBi, separately. The surface current distributions at the operating frequencies and the typical notched frequencies are presented for verifying the design method and principle of the antenna. Consequently, the mutual interference between the narrowband systems of WiMAX/WLAN/5G/X-band satellite communication and UWB communication system can be reduced significantly. Moreover, the design has the smaller size of 26×25 mm2, compared with existing triple band-notched UWB antennas. Therefore, the antenna is very promising for modern UWB communication applications.