Novel analysis and modeling of lossy sub-millimeter waveguides

A new technique for the analysis and attenuation calculation of sub-millimeter waveguides is proposed in this paper by dividing the domain into several slices, in which the propagation constant ß and impedance Z for each slice were calculated and then used to estimate the overall attenuation as well as the reflection and transmission coefficients. Variations of losses with the waveguide dimensions, doping, and number of slices have been investigated in details. Further, a complete set of equations for the analysis and modeling of such lossy waveguide structure is presented. It is shown that the attenuation of such a waveguide has a peak value at a specific density (cm^-3) of the lossy material.