Band-Notched Reconfigurable Ultra-wideband Antenna Based on Square Ring Slot

This paper proposes a band-notched reconfigurable ultra-wideband antenna based on square ring slot. By adding two ellipatical patches around the 3×3 circular metasurface, the working bandwidth of the antenna is effectively expanded. Through arranging two sets of square ring slots on the rectangular ground plane, notched band within the ultra-wideband is emerged. Furthermore, adjusting the on-off state of the eight PIN diodes in the square ring slot, the antenna realizes reconfigurable notched band. The results show that the -10 dB bandwidth of the antenna ranges from 3.5 GHz to 8 GHz, and five band-notched modes are realized at 3.5 GHz, 4.7 GHz, 5.1 GHz, 6.2 GHz and 7.2 GHz.