Modeling High Frequency Propagation in Tunnel Environments by IterativePhysical Optics Method

Abstract

A new formulation of the Iterative Physical Optics (IPO) method, including waveguide wall loss effects, has been developed to model high frequency electromagnetic wave propagation in tunnel environments. The lossy behavior of the tunnel walls has been considered throughout the inclusion of the Impedance Boundary Condition (IBC) model in the formulation of the IPO. Different arched tunnels have been studied, showing that this approach has a convergent behavior and providing accurate results for realistic tunnel models. Moreover, the computational cost associated with the analysis of long tunnels has been significantly reduced by using a connection scheme which splits the tunnel into a set of short sections that can be more easily analyzed. Some results are shown, illustrating the capability of the proposed method.