Comments on "Theoretical and experimental characteristics of single V-Groove guide for X-Band and 100 GHz operation" [with reply]

In the above paper [see ibid., vol. 36, p. 715-23, 1988], the key question is to derive the scaling factor, h(x,y), which is necessary for the determination of the propagation characteristics of single V-groove guide. The authors use a conformal mapping technique to obtain it. Since the cross section of the V-groove guide is symmetrical, one quarter is considered only. According to the symmetrical principle of the conformal mapping, the transformed cross section is also one quarter of the parallel-plate waveguide which is filled with a nonisotropic and nonhomogeneous medium, and the scaling factor h(x,y) should be symmetrical about both x axis and y axis. Therefore, the transformed cross section which is plotted in the complex Z plane should be modified. The original authors give their reply.<>