A recommended Maliuzhinets diffraction coefficient for right angle lossy wedges

Diffraction by right angle lossy wedges formed by building surfaces is of great importance for field strength predictions in ray-based and ray-tracing methods in urban and indoor microcellular mobile communications. Some important conclusions related to the efficiency of different diffraction coefficients are derived, by comparing the diffraction fields generated by 90° and 270° lossy wedges illuminated by TM and TE waves. For a right angle wedge, Holm´s diffraction coefficient is more accurate than Luebbers´ in a deep shadowing region. However, the prediction results are quite poor in some illumination regions for both of the heuristic diffraction coefficients. For a 270° wedge, the heuristic diffraction coefficients are invalid. The simplified Maliuzhinets diffraction coefficient is recommended for field strength prediction in microcellular mobile communications.