Transmission line model for rectangular waveguides accurately incorporating loss effects

Based on the expressions for electromagnetic fields in a lossless rectangular waveguide and the current densities on its walls an equivalent two-wire transmission-line model is derived that accurately describes the propagation characteristics of a TE₁₀ mode in the lossy waveguide. The influence of both loss-mechanisms - conductor and dielectric - not only on attenuation, but also on the phase coefficient is inherently included in the model and precisely outlined. The per unit length parameters are extracted from the underlying physical relations and finally yield geometrical and material dependencies that allow for accurate analysis and modeling of rectangular waveguide interconnects.