A Para1netri.e Formulation of the UTD Diffraction Coefficients for a Dielectric Wedget

Appropriate formulation of the UTD diffracted field is important for propagation prediction. Among the wedge. diffraction solutions for nonperfectly conducting surfaces in the literature, exact formulations are mostly based on Maliuzhinets's derivation [1] and are computationally prohibitive for practical applications. On the other hand, heuristic formulations, modified from the UTD diffraction coefficient in (2], enables fast evaluation. Among them, perhaps Luebbers' model (3] is the most widely used. Although this method offers easy implementation, it generally does not yield accurate estimation of diffracted field in the shadow region. This is detrimental to path-loss prediction for wireless communication systems [ 4].