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Delay Spread of Electromagnetic Waves Propagating along Random Rough Surface

This paper is concerned with the numerical analysis of propagation characteristics of electromagnetic waves traveling along two-dimensional (2D) random rough surface (RRS). Ray searching algorithm is based on 2D discrete ray tracing method (DRTM), and the field distribution corresponding to each searched ray is computed by using source and image diffraction coefficients. Numerical computations are carried out for total field distributions along RRS as well as the delay profiles at an arbitrary observation point which is far from a source antenna. Detailed discussions are made on the effect of directivity of a source or a receive antenna to the delay spreads of received powers.