HIGH-FREQUENCY BEAM DIFFRACTION BY A DIHEDRAL CORNER REFLECTOR

Two dimensional beam diffraction by a 90 degrees-dihedral corner refle ctor with sides of finite length is analyzed. First the solution for a n isotropic electric line source parallel to the corner and edges is o btained for high frequencies by the uniform geometrical theory of diff raction with shadow and reflection boundary positions identified. By i ntroducing appropriate complex coordinates for the source position the solution for a beam directed at the corner is obtained. The shift of shadow and reflection boundaries is plotted for various source directi vities. Numerical results for the effect of source directivity on the far field radiation patterns are also shown. The procedure can be exte nded to high frequency scattering by other finite polygonal structures .