X and S-Band Frequency-Switched Active Frequency Selective Surface Using Control Network

This article introduced an active frequency selective surface (AFSS) in which the state of the unit cell can be controlled independently. The structure of the cell consists of a periodic metal pattern printed on the dielectric substrate and a bias circuit. The PIN diode is applied in the metal pattern. In addition, This paper also analyzes the influence of metal pillars produced by bias circuit on resonance characteristics. It works as a absorber in the X band when the diode is fully on, and works in the S-band when the diode is completely off.