Comments on "Full-Band Low-Loss Continuous Tracking Circulation in K Band" [Letters]

In a recent paper, Konig et al. report the design of a wide-band Y-junction stripline circulator for the 18-26.5-GHz frequency band. In this paper, among the design constraints and assumptions, it is stated, "Adjust the ground plane spacing such that the first transformer step physically subtends an angle at the edge of the ferrite resonator equal to the coupling angle psi."