Nonspecular reflection of Gaussian wave beams on a two-dimensional periodic array with shorted waveguides of rectangular cross-section

This paper investigates nonspecular reflection of three-dimensional Gaussian wave beams from a two-dimensional periodic grating of short-circuited rectangular waveguides. 'Orthogonal' beam reflection from a periodic structure has been examined. The correlation of reflection rates in terms of power and the length of short-circuited waveguides has been estimated for specular and nonspecular beams. The relation of the reflected beams' directional pattern in the far field to the array and incident beam parameters has been investigated. The splitting effect of the reflected beams' directional pattern has been established in the case of p-polarized beam incidence. The possibility of applying a grid of rectangular waveguide sections in an electromagnetic field impulse compressor has been demonstrated. Various operational modes of the reflection grating used as a coupling element between the open-structure resonator and the transmission line have been described. The effects of directional pattern reduction and reflected beam directional pattern deformation have been established. These effects have been physically grounded. The results are presented in the form of three-dimensional directional patterns of the diffuse beam field in the far field. The calculation algorithm is based on the available solutions of the key vector problems of plane linearly polarized electromagnetic wave diffraction on two-dimensionally periodic structures. (paper)