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In this article, the Method of Auxiliary Sources (MAS) is applied for analysis of angular incident of electromagnetic plane wave on two-dimensional dielectric sphere arrays. Homogeneous dielectrics spheres are placed on rectangular grid. To fulfill the Floquet conditions, in the MAS algorithm the lattice sum of electric dipoles is applied as a Green's function. The structures are investigated numerically. The MAS approach is applied to periodic structures. The presented results demonstrate the arrays as Frequency Selective Surfaces (FSS).