Antenna Handbook

The diffracted rays in the GTD originate from certain "localized" regions on the surface of a radiating structure, such as at discontinuities in the geometrical and electrical properties of a surface, and at points of grazing incidence on a smooth convex surface as illustrated in Fig.

Razele difractate din GTD provin din anumite regiuni "localizate" de pe suprafata unei structuri radiante, cum ar fi la discontinuitati in proprietatile geometrice si electrice ale unei suprafete si la punctele de incidenta a pasunatului pe o suprafata neteda convexa, asa cum este ilustrat in Fig. .