Guilin Sun
Ansys Employee

yes, you are right. You can prove it in theory, as the lossy field is expressed as E0*exp(jk0*z) and k0 is complex. Please note that for such loss calculation MODE FDE is the most accurate method, which does not have any source injection error, numerical dispersion error, and monitor interpoation error ad other errors in FDTD due to discretization and simulation.