Coupling of finite integration technique and ray tracing

We present a hybrid formulation which combines the finite integration technique (FIT) with a ray tracing technique. Ray tracing allows the treatment of complicated structures with very large objects. A typical application of ray tracing techniques is the simulation of indoor propagation. The presented hybrid technique has therefore a rather broad field of applications in contrast to other hybrid methods. A critical point in the implementation of the hybrid method is the modeling of the sources for the ray tracing part. The sources used by these techniques are considered usually as point sources with a given directivity. Applying the Franz integral representation for the far fields, the field distribution over the boundary surface can be substituted by a single point source. This approach can improve the performance of the method dramatically.