Fano-Resonant Frequency-Selective Surface With Cross-Shaped Apertures

Copper frequency-selective surfaces with cross-shaped apertures fabricated by using laser ablation technology are investigated numerically and experimentally. Simulations and measurements are carried out for the $W$ -band range and the central frequency 90 GHz. It is shown that a single Fano resonance (FR) is excited when the symmetry of the aperture elements is violated. This resonance is highly sensitive to the polarization of the incident electromagnetic (EM) wave and geometrical parameters of periodic elements, in particular, the asymmetry of apertures. The EM effect found can be utilized to develop new functional devices of the mm-wave range.