Modified Ground Circle Like-Slot Antenna with Dual Band-Notched Characteristics for Super UWB Applications

In this paper, a compact modified ground slot antenna is proposed. This antenna is designed for super ultra-wideband (UWB) applications. To reduce the interference effect on the WLAN and WiMAX systems, it comes up with dual band notched characteristics. In the antenna geometry, a pair of L-shaped stubs connected to the fork-shaped patch is employed to introduce single band-notched characteristics in 5.15-5.825 GHz for WLAN system. This feature also causes that the middle frequency of the band is highly improved. Moreover, a T-shaped stub is added to the center of the fork-shaped patch to generate the frequency band stop performance in 3.3-3.8 GHz for WiMAX system. Furthermore, we propose a modified ground plane including a pair of inverted T-shaped slits, cut from the ground plane, to improve the bandwidth to 164%. The simulation and measurement results indicate a very wide impedance bandwidth from 2.5 up to 23 GHz, with pre-designed dual band notched properties, for the proposed antenna. This slot antenna with above-mentioned frequency bandwidth has a compact size of 24x25 mm(2), and therefore is suitable for many UWB applications.