Preliminary studies are required in order to use microwaves as support of informations transmission inside building because of the problems of multipath propagation.We present simulations based on the Uniform Theory of Diffraction (U.T.D.) and the first example concerns diffraction phenomena due to an elementary wedge formed by two walls. A comparison experience-theory show that the ropagation outside the building iS well described.Then,the same numerical theory is employed to characterize the propagation inside the building,or more exactly,to predict the mean Variation of the field amplitude when a receiver moves inside the building. Results of numerical simulations which are made on an abrupt sharp bend of a corridor allow to evaluate coupling losses between the two parts of this corridor.Ray launching technicS will be considered later in order to extend these redicting models to an entire building.
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