Diffraction of plane electromagnetic waves on semiinfinite grid of parallel conductors arranged at angle to its edge

The problem of diffraction on a semiinfinite grid comprised of parallel conductors set at an arbitrary angle to the grid edge with an oblique incident plane wave is examined. The scattered field is found to represent the superposition of geometric optical, edge and surface waves. No surface wave occurs when the conductors are parallel to the edge of the grid, or when the angle between the x axis and the direction to the source is the same as the angle between zeta(sub 0) and = x0. When the wave is normally incident with respect to the edge of the grid, no surface wave occurs when the conductors are parallel or perpendicular to the edge. The solution obtained by the Kirchoff approximation method contains no surface wave, and the edge wave depends differently upon the parameters of the grid and the coordinates of the observation point than for the more rigorous solution.