Diffraction Interaction of Neighboring Edges on a Ruled Surface

This chapter considers a diffraction interaction of two edges with a common face. If this face is bent, the edge wave already undergoes diffraction on its way along the face to another edge. The ray asymptotics of the diffracted field can be found using the stationary-phase technique. At the shadow boundary the normal derivative of the total field is continuous and equal to one-half of the normal derivative of the incident wave. The uniform high-frequency asymptotics with arbitrary high precision have been developed there for the scattered field and for the surface currents on the strip. The chapter employs the first-order high frequency approximations for the scattered field. It presents the secondary wave predicted by the exact asymptotic theory.