Raytracing analysis of lens antennas - practical approach

In this paper an overview of the raytracing approach for analyzing dielectric lens antennas is given with special attention paid to practical realization of such program. The raytracing technique is very well known, but in most scientific texts the algorithm is described only in basic concepts. Here we shall describe the basic steps required to write a raytracing software including the definition of the structure, finding the ray-surface intersections, calculating the directions of the reflected and refracted rays in general 3D case and finally the steps needed for performing the physical optics integration and calculation of far-field radiation pattern.