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A complementary frequency selective surface (CFSS) can be formed on the basis of Babinet's principle. It consists of an array of slots separated from an array of dipoles by a thin dielectric substrate. This study shows that by adding an extra layer of dipoles to a CFSS capacitance can be added to the structure, which leads to a decrease in its resonant frequency. This new structure is called a dipole-slot-dipole...
Square loop CFSS are constructed by placing a layer of metallic loops on one side of the dielectric and aperture loops on the other side. Two different configurations of square loops CFSS are presented: It is shown that by shifting one layer by half the periodicity the resonant frequency of the pass band is significantly reduced. The effect of changing the dielectric thickness on both structures is...
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