Numerical study on a designable linear-resonant multiband single-layer fractal frequency-selective surface

In this paper, the multiband transmission resonant properties of single-layer Minkowski fractal planar frequency-selective surfaces (FSSs) at normal-incidence case were numerically investigated in detail. The self-similar iterative transformational method was proposed to construct the fractal FSSs. Both the finite integration technology and finite element method were used to calculate the magnitudes and phases of transmittances, and then the induced surface current and magnetic energy density distributions were demonstrated to analyze the insight physical picture of the multiband resonant feature. The results indicate that the individual resonant frequencies of our fractal FSSs present a periodical linear-resonant phenomenon and they could be designed easily and precisely just according to the geometrical characteristic of each iteration. With the intriguing resonant properties, the fractal FSS has a potential application in the fields of dual-band or multiband resonance.