Extension of fast far field algorithm to propagation over lossy dielectric terrain and buildings

In this paper the Fast Far-Field Approximation (FAFFA) is extended to 2D problems involving EM wave propagation over lossy terrain and over concrete buildings. A coupled surface electric field integral equation formulation is used and solved using the method of moments. The unknowns corresponding to the unknown electric and magnetic fields are interleaved to facilitate the use of the forward-backward method (FBM) and the block forward-backward method (BFBM). Results show good agreement with measured data in the case of propagation over terrain. The FAFFA-accelerated fields are in good agreement with a slow reference solution in the case of propagation over buildings. Convergence of the FBM is investigated.