ELECTROMAGNETIC SCATTERING OF A SURFACE WAVE FROM NOTCHES IN A GROUND PLANE COVERED BY A DIELECTRIC SLAB.
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The 'notch' problem is investigated with the objective of studying the scattering properties of surface waves guided by a dielectric slab over a ground plane where the surface waves encounter surface discontinuities in the ground plane. A solution is presented in the form of a set of coupled integral equations in terms of the unknown tangential electric field at the interface between the notches and the dielectric slab. The integral equations contain a set of infinite series due to the presence of higher order waveguides modes in the notches as well as a set of Sommerfeld integrals accounting for the presence of the dielectric slab. A solution for the aperture electric fields is obtained for certain special cases by means of the method of moments. A far field analysis is done using the saddle point integration technique. A scattering (S-) parameter representation is presented as a means of describing the system of incident, transmitted and scattered fields about the notch.
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