Comments on "The groove guide, a low-loss waveguide for millimeter waves"

For original paper see F.J. Tischer, ibid., vol.11, pp.291-296. In the above paper, Tischer presents not only a new millimeter waveguide-the groove guide, which has been studied in recent decades-but also a new method to analyze it. However, in the paper, several conclusions he gives are wrong.<
>