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Browsing by Author "Ali, Aysha"

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    Master Thesis
    The application of BDW method to the plane diffraction problem from PEC half plane
    (2006) Ali, Aysha
    Diffraction is a phenomenon by which wavefronts of propagating waves bend in the neighborhood of obstacles. Diffraction around apertures is described approximately by the diffraction wave method. Diffraction problems are among the difficult encountered in optics, and exact rigorous solutions are quite rare. A new procedure for calculating the scattered fields from a perfectly conducting body is introduced. The boundary diffraction wave method is used to evaluate the scattered field at an observation point after a certain obstacle with an aperture. The scattered field is combination of the diffracted and transmitted fields. The diffracted field is originated from the boundary of the aperture whereas the transmitted field originates from the aperture itself. The boundary diffraction wave method defines a new vector potential which is associated with any incident scalar wave field, and the integral of this vector potential expressing the field scattered by a perfect conducting screen with an aperture whose dimensions are larger than the wavelength. The Helmholtz-Kirchhoff formula is expressed in terms of the new vector potential to evaluate the disturbance, from certain points Q on a surface S, at an observation point. The method demands that the location of the point Q always depends on the location of the observation point