Calculation of Cutoff Wavenumbers for TE and TM Modes in Tubular Lines with Offset Center Conductor (Comments)

In the paper by Vishen et al. [1], the authors refer to two papers of ours, numbered [8] and [10] in their list of references, and apparently without any elaboration make certain unwarranted comments on the method and results of [8], namely: Some of the tabulated parameters of [8] actually yield nonphysical results; also, symmetric and antisymmetric modes appear to be degenerate, which contradicts experimental observations.