| Abstract: | The geometric theory of diffraction is a well known and very successful asymptotic technique in electromagnetics for the evaluation of scattered fields from objects that are large compared to the wavelength. Our recent work has produced approximate diffraction coefficients for diffracted rays from edges and corners in planar conducting or dielectric surfaces. These diffraction coefficients are tested here by comparing theoretical predictions with experimental measurements made at 30 GHz of the diffracted field from a conducting quarter plane. Very good agreement is found between this asymptotic approach and experimental results for a linearly polarised incident field, with the E field aligned with one of the edges of the quarter plane. The incident field direction is varied from 5° to 54° to the normal to the quarter plane and the total field is measured over a plane behind the target. Average agreement for intensity values is found to be around 95%. |
