Reconfigurable dual-band frequency selective surfaces using a new hybrid element

In this paper, a new active frequency selective surface (AFSS) is proposed as an electromagnetic (EM) window for TE-polarized incident waves. A unit cell of this AFSS includes of a strip dipole and an elliptical loop, deliberately combined in a single layer configuration to create a dual-band transmission/reflection coefficient response. High frequency PIN-diodes are also integrated into the surface to reconfigure the transmission/reflection coefficients of the EM window across two close frequency bands of 1.8GHz and 2.45GHz. In this configuration, the effect of the diode parasitic capacitance is used as a potential feature in creating the first operating band. The achieved results show that the proposed surface can be a good candidate for reconfigurable reflectors or it can be used in electromagnetic shielding applications.