Electromagnetic scattering by a thin conducting flat plate with doubly periodic punched circular apertures

The problem of scattering of electromagnetic waves by a thin conducting flat plate loaded with doubly periodic small circular apertures has been theoretically investigated. An expression for the monostatic scattering cross-section has been obtained by treating the planar array of circular apertures as an array of (a) induced electric and magnetic dipoles and (b) diffracting apertures for parallel and perpendicular polarisations. The effect of punched apertures on the monostatic scattering cross-section has been presented.