Self-Adjoint Vector Variational Formulation for Lossy Anisotropic Dielectric Waveguide (Comments)

In the above paper, the authors present a "new variational formula" and its derivation. A careful inspection of the text shows that there are a number of errors and wrong conclusions with the fatal consequence that the final variational formula [1, eq. (37)] is incorrect. The main fallacy of the authors appears to be the derivation of the adjoint solution, and the following discussion will be restricted to this point.