TE SCATTERING BY A CYLINDRICAL DIELECTRIC OBSTACLE BURIED IN A HALF-SPACE - A H-FIELD-BASED SOLUTION METHOD

Scattering of a transverse electric (TE) wavefield by an inhomogeneous lossy dielectric cylindrical obstacle embedded in a lossy dielectric half-space is investigated. The cylinder is of arbitrary cross-section , and its axis lies parallel to the interface. The formulation involve s a domain integral equation of the field obtained by applying the Gre en's theorem to the appropriate Helmholtz wave equations. The convolut ion-correlation structure of the formulation is such that the discreti zed counterpart of the integral equation (provided by the application of a Method of Moments where the obstacle is divided into triangular p atches and where the contrast and the H-field are expanded using two d ifferent basis functions) can be efficiently handled using a FFT-based conjugate gradient solver. The validity of the approach is illustrate d by comparison with results found in the literature.