An integral equation formulation for analysing frequency selective surfaces (FSS) in cascade with dissimilar lattice geometries is described. The tangential field vectors are expanded by defining their Floquet modes according to the convolution theorem. The plane wave transmission coefficient of a multiresonant structure which has triangular and square lattices, with noninteger multiple ratios of their sides, has been computed.
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Vardaxoglou et al. (1993) studied this question.
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