A novel active frequency selective surface with switching performance for 2.45 GHz WLAN band

In this paper, we propose a novel active frequency selective surface(AFSS) that transmits 2.45 GHz WLAN signals in the ON state while functioning as a band-stop filter to shield those signals in the OFF state. A special topology that requires no additional biasing lines between two adjacent FSS cells is applied to weaken the feeder network´s negative impact on the transmission characteristics of the AFSS. Circular apertures are employed in the structure to satisfy the need of ventilation and heat dissipation. The proposed structure exhibits stable performances for both TE and TM modes with incident angles from 0o to 30o.