Equivalent circuit analysis for alternated double layer patch type FSS with dielectric substrate

This paper describes the filtering characteristics of the alternated double layer patch type FSS (Frequency Selective Surface) in which a patch type FSS is arranged alternately at the surface and the back of a dielectric substrate. The equivalent circuit and the empirical equation of the coupling coefficient including dielectric substrate effect are proposed. It is also shown that the approximate equation is valid when the thickness of the dielectric substrate t/p less than 0.5.