Ohmic Loss Distribution Analysis of a Coaxial Waveguide With Misaligned Inner Rod

The azimuthal distribution of the ohmic loss in the coaxial waveguide with a misaligned inner rod is investigated in this paper. For axially symmetric modes with zero caustic radii, a little misalignment will bring a large change of the azimuthal ohmic loss distribution on the inner rod and the outer wall, and the change is more noticeable for a larger misalignment or a larger ratio of the inner to the outer radii in a coaxial waveguide; for asymmetric volume modes and whispering-gallery modes with nonzero caustic radii, when the inner rod radius is smaller than the caustic radius of a given mode, the azimuthal ohmic loss distribution is almost unchanged with a small misalignment, but when the inner rod radius is larger than the caustic radius, the azimuthal ohmic loss distribution changes obviously with the misalignment, and this change is larger for the coaxial waveguide with a larger ratio of the inner to the outer radii or a larger misalignment of the inner rod. This noticeable change may cause the azimuthal accumulation of heat on the inner rod and the outer wall in a coaxial waveguide or cavity.