Effects of Surface Roughness on Lossy Rectangular Waveguide

摘要

The integral equation method combined with the surface-impedance boundary condition is applied for the analysis of propagation characteristics of rough lossy metal waveguides. The surface roughness of waveguide is random, and the statistical properties associated to the wall roughness are consistent with a Gaussian random process. The effects of the waveguide parameters on the propagation constant and attenuation constant are discussed rigorously, including the frequency, the standard deviation of height and correlation length of the Gaussian roughness. The results show that, as the increases of correlation length and frequency, the propagation constant is increased and the attenuation constant is decreased; while as the increase of the standard deviation, the trends of the propagation constant and the attenuation constant are just opposite.