Firstorder equivalent current and corner diffraction scattering from flat plate structures
Abstract
The equivalentcurrent concept is used to compute the scattering patterns of flat plate structures. It is also used to obtain the broadside scattering lobe for any incidence plane. The essential feature is that only the components of the equivalent current perpendicular to the incidence plane are used. No special treatment of the singularity in the planewave diffraction coefficient (which is the basis of the equivalentcurrent concept) is required. Instead, the choice of equivalentcurrent components is such that the singularity at one edge segment is canceled by the singularity at the opposite edge segment. For modernday computers there is sufficient accuracy that the main scattering lobe can be obtained in the limit as one approaches broadside. The same results can be obtained for plate structures made of straight edges by using a new cornerdiffraction analysis. For certain cases where the observation angle is sufficiently removed from normal incidence to an edge, the cornerdiffraction analysis appears to yield more accurate results.
 Publication:

IEEE Transactions on Antennas and Propagation
 Pub Date:
 July 1983
 DOI:
 10.1109/TAP.1983.1143116
 Bibcode:
 1983ITAP...31..584S
 Keywords:

 Current Distribution;
 Electromagnetic Scattering;
 Flat Plates;
 Plane Waves;
 Radiation Distribution;
 Wave Diffraction;
 Computer Techniques;
 Corners;
 Diffraction Propagation;
 Scatter Propagation;
 Singularity (Mathematics);
 Wedges;
 Communications and Radar