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Abstract
A semi-analytical procedure has been developed to treat scattering of horizontally polarized electromagnetic waves from underground cylindrical inhomogeneities. The air-ground interface is assumed to have a sinusoidal profile. The proposed procedure uses Green's functions theory together with the principle of extended boundary conditions. The unknown electric field inside the scatterer is determined by solving an appropriate integral equation over the cross section of the scatterer. Then the far field in the air is evaluated by employing the steepest descent approximation and the normalized scattering amplitude is plotted for several cases.