In this paper the scattering characteristics of dielectric periodic structures by an oblique incidence are analyzed by a method which combines the multimode network approach with rigorous mode matching method. The dependence of frequency selective characteristics of the 3-D frequency selective surface(FSS) structures on frequency and angle of the incident wave and the structure parameters is quantitatively studied. Therefore, some guidelines for design and application of the 3-D FSS structures are given.
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