Multiple path diffraction by rectangular buildings

Consideration of only the two dimensional great circle path is insufficient to determine the diffracted field strength in the shadow of a finite width obstacle such as a rectangular building. A simplified absorbing slab model based on Fresnel integral methods is proposed as an appropriate model for determining the diffracted field strength in such cases. Predictions are compared with experimental results obtained at 11.2 GHz using an isolated building and a building in a cluttered urban environment as diffracting obstacles.