Equations (4) and (6) – (9) in the above-commented work are not always correct. Here, a general condition for the existence of TE <tex-math notation="LaTeX">_ z </tex-math> and TM <tex-math notation="LaTeX">_ z </tex-math> (i.e., TE and TM waves related to the z-axis) modes in a rectangular waveguide loaded by an anisotropic metamaterial (when the permeability tensor is represented by a diagonal matrix) is presented.
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Afshin Moradi (2024) studied this question.
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