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Electromagnetic Scattering from an Array of Multiple Slit Coupled Cylindrical Impedance Cavities

A generalized procedure was developed to investigate the multiple scattering characteristics of an array of multiple slit-coupled cylindrical impedance cavities for both TM z and TE z incident plane waves. Based on the direct integral equation technique combined with the Galerkin's procedure, the induced current on the impedance walls was expanded in terms of the Chebyshev polynomials of the first kind with fast convergence rate. The far-zone scattered field solutions to such a multiple coupling system were obtainable in analytical form. Numerical calculations were performed to show the variation of the far-zone scattered fields with the geometrical sizes of some typical array design parameters, such as the angular widths of cavity walls or slits, as well as the inductive and capacitive impedance parameters.