Accurate analysis of losses in waveguide structures by compact two-dimensional FDTD method combined with autoregressive signal analysis

An efficient two-dimensional finite-difference time-domain (2-D FDTD) method combined with an autoregressive (AR) signal analysis has been proposed for analyzing the propagation properties of microwave guiding structures. The method is especially suitable for analyzing lossy transmission lines; and in contrast with previous approaches, it is based on an algorithm of a real domain only. The algorithm is verified by comparing the numerical results with exact solutions for dielectric loaded rectangular waveguides. The conductor losses in a variety of microstrip lines and coplanar waveguides have been accurately estimated by solving the electromagnetic fields in the conductors directly.