A Simple Method for Calculating Attenuation in Waveguides

We present a simple technique to compute the attenuation of electromagnetic waves propagating in waveguides with imperfect conducting walls. The propagation constant can be computed by numerically solving the transcendental equations, derived from the surface impedance of the walls and substituting the results into the dispersion relation. Good agreements were found between the results obtained using our method and that using StrattonÌs rigorous equation and Kohler and BayerÌs approximate equation, for both circular and rectangular waveguides, respectively. Index Terms – Attenuation, waveguides, propagation constant, surface impedance