The attenuation and propagation factor of spaced-disc circular waveguide

Losses in trapped-mode resonators

“…By means of a modal expansion, the problem of finding the attenua tion and propagation factor of spaced-disc circular waveguide is con sidered by Gent (11). His formulation yields the result that the attenuation of a spaced-disc guide (a structure not unlike the circular walls of a trapped-mode resonator) is lower than that of a solid wall guide.…”