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(a) Schematic of the FSS filter optimized by a GA to exhibit dual stop bands at 3.3 and . The period of the unit cell is . The thickness of the polyimide dielectric layers is on each side of the silver metal elements. (b) SEM image of a fabricated filter without the top polyimide dielectric layer. The inset shows an enlarged image of one unit cell. The bright areas are the silver elements and the dark areas are the dielectric.
PMoM-modeled transmission spectrum (filled red circles) and reflection spectrum (empty red circles) at normal incidence of the designed metallodielectric filter shown in Fig. 1(a). Measured transmission spectrum at normal incidence (solid black line) and reflection spectrum at 15° (dashed black line) of the fabricated filter. Both spectra were taken using an unpolarized source.
The relative surface current distribution on the metal elements at the two resonance wavelengths: (a) and (b) for two orthogonal polarizations, induced at normal incidence. The white arrows indicate the polarization. The colored bars indicate the relative current density.
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