  Different periodical Frequency Selective Surfaces(FSS) whose unit cell are
the Split Ring Resonators (SRR) or related geometries and their corresponding
complementary screens were studied. This kind of FSS, sometimes called
metasurfaces, have the advantage of avoiding secondary grating lobes because of
the small electrical size of the unit cell. The main aim of this paper is to
investigate the effects of the metal thickness for these FSSs. It was found
that the quality factor decrease for unconnected elements (strips) and increase
for connected elements (slots). Besides, as the thickness increases, the
resonance frequency decrease for the case of unconnected elements while
increases for connected elements.
