Single-Post Inductive Obstacle in Rectangular Waveguide (Comments)

Leviatan et al. have made, in the above paper, an important contribution to the theory of posts in rectangular waveguide, but unfortunately failed to reference the key paper by Abele [1]. Abele's technique was found to yield excellent results when used to design inductive posts for rectangular waveguide bandpass filters [2], and should be brought to the attention of readers of the TRANSACTIONS.