Abstract
AbstractFor the problem of plane‐wave diffraction from metallic gratings with arbitrary complex permittivity, a new analysis method based on the boundary‐element method is proposed. First, this diffraction problem is analyzed by the boundary‐element method as a two‐media boundary value problem taking into consideration the metallic loss. Further, a simple method is proposed in which an approximate boundary condition using the surface impedance is incorporated into the discretized equation by the boundary‐element method. Especially, in the method using the surface impedance approximation, the region to be analyzed is reduced to only the incident side so that efficiency of both the formulation and the numerical calculation can be improved significantly. The diffraction characteristics of the sinusoidal grating and the Fourier grating were actually computed. The results were compared with those by other methods and by experiments so that the validity and usefulness of the present method are confirmed.
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