Reconfigurable Wideband FSS With High Selectivity

This work proposes a reconfigurable wideband FSS with high selectivity. First, we construct a novel bandpass filter circuit model consisting of three resonators and multiple transmission lines. For resonator I, the p-i-n diode connects with a capacitor are used to achieve bandpass-to-reflection switching. For resonators II and III, the two series $LC$ resonators are used to provide two transmission zeros (TZ) in dual sidebands resulting in high filtering selectivity. In particular, three resonators cascaded inductively coupled through multiple transmission lines for achieving second-order and wideband bandpass performance. Second, to construct the simulation model of the proposed FSS, we use dipole patches in series with diodes, crossed metal grids, fork-finger capacitors, and triangular patches to realize the corresponding resonators, respectively. Finally, simulation results verify its cutting-edge performance, demonstrating the device exhibits a passband over 18.2% bandwidth and four independent switchable cases under dual polarization.