Multipath propagation study combining terrain diffraction and reflection

In this paper, a multiple knife-edge attenuation formula is derived by comb ining diffraction and ground reflection. As an example, the attenuation by double knife edges with ground reflection is derived in detail and the atte nuation by a flat-topped obstacle with slanted sides is also calculated. Th e attenuated fields are proven to be the combination of eight field compone nts, and the number of multipath reflection rays can be reduced based on th e location of the main reflection point defined by path parameters. The for mulas have clear physical meanings and can be used for field strength predi ction in both mobile and fixed communications.