CAD of one-layer frequency selected surfaces with metamaterials properties

In this study, we present CAD of (a) double slit tetragonal resonators and (b) microstrips (wires) resonators periodically expanded on the top surface of a substrate made from a dielectric, using the finite difference time domain (FDTD) method. From the calculated complex S*-parameters, we found the effective complex magnetic and dielectric constants of all the structures, when an electromagnetic wave incidents vertically to the top surface of substrate and at two different polarizations of electric field relative to the geometry of resonators. Our calculation shows the existence of positive or negative internal constants and optical bandgaps at different frequency areas between 0 and 60 GHz. Also, in this study, we present a correlation between S-parameters and the sign of the calculated internal effective constants.