An efficient technique for computing the response of a planar FSS as a function of the incident angle

The authors present an efficient method for computing the dominant mode (zeroth-order Floquet harmonic) scattering characteristics of a single-layer FSS (frequency selective surface) system for multiple angles of incidence. An interpolation procedure is considered where the most computationally intensive aspect of determining the currents and scattering parameters is carried out numerically rigorously for only a few incident angles, and computed via interpolation for the remainder. Some representative examples derived by using the cubic spline interpolation procedure are given, where the exact and estimated values of the transmission coefficient, S12, are compared, and the CPU times associated with these examples are quoted.<>