A fast technique for the analysis of infinite frequency selective surfaces

In this paper, a computationally efficient approach using equivalence principle for the method of moments solution of the infinite doubly periodic frequency selective surfaces has been introduced. This approach involves forming a dual screen geometry with reduced metallization, which in turn leads to a reduction in the number of unknowns. Reformulation of the problem by using MFIE is not necessary, and the existing legacy codes employing the EFIE can easily be modified to accommodate the present approach. Numerical experiments reveal the accuracy and the computational advantage of this technique when compared to the conventional techniques.