Abstract

The exact solution of the wave equation for an incident plane wave in the spheroconal coordinate system is used to obtain formulas for scattering amplitude for a plane angular sector subject to Dirichlet or Neumann boundary conditions. These formulas are obtained by performing line integrals along the edges of the sector. The arguments of these integrals are the coefficients of the field singularity along the path of integration. @S1063-651X~97!10807-8#

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