Some Diffraction Coefficients Related to Diffractions at the Edges of Curved Reflectors

To analyse the diffraction of high frequency waves one recourses often to the Geometrical Theory of Diffraction whose aim is to describe this phenomenon in terms of rays and certain factors. These latters involve several diffraction coefficients showing the modifications which occur when a ray is transformed into another one at a diffraction point. The aim of this paper is to give explicit expressions for certain coefficients related to diffractions occuring at the edges of cylindrically curved reflectors. On account of the locality of high-frequency diffraction phenomenon, all the coefficients given here can also be used, with some precautions, to calculate diffracted fields even when the reflector is not cylindrical.