FIELD-STRENGTH PREDICTION BEHIND LOSSY DIELECTRIC OBSTACLES BY USING THE UTD

A comparison is made between the measured and theoretically predicted field strength in the shadow region of a lossy dielectric obstacle. Th e field is measured along a cylindrical arc behind the obstacle at a f requency of 50 GHz. The theoretical model uses the uniform theory of d iffraction including corner, edge-to-edge, and edge-to-corner diffract ion, heuristically extended to include effects of nonperfect conductiv ity. The agreement between the measured and theoretically derived resu lts is excellent for both orthogonal polarisations considered. The fie ld behind a lossy block-shaped obstacle proves to be less polarisation dependent than behind a perfectly conducting one.