a normal mode where the subscripts m and n added to the abbreviations ТЕ are assigned by observing the cross-sectional variation of the transverse electric field vector:
1 – In a rectangular waveguide subscripts m and n, in that order, indicate the number of half-period variations of the mainly transverse field vector along paths parallel to the wide and narrow walls respectively.
NOTE – The reverse notation, where the m and n paths are parallel to the narrow and wide walls respectively is deprecated.
2 – In a circular waveguide subscript m indicates the number of full-period variations of the transverse field vector along a circular path concentric with the wall, and subscript n indicates the number of reversals of the same vector along a radial path, plus one
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