Comments on "On the mode coupling in longitudinally magnetized waveguiding structures" [with reply]

For original paper see J. Mazur and M. Mrozowski, ibid., vol.37, no.1, pp.159-64 (Jan. 1989). The above paper gives theoretical explanation of the operation of nonreciprocal devices based on coupled ferrite lines (CFLs) with longitudinal magnetization. A CFL in a nonreciprocal device must be a phase nonreciprocal structure. Some new variants of a CFL have also been proposed. Those differ in symmetry from the existing CFL. Since there were no theoretical and experimental confirmation of the capacity for work of the new structures, a question arises in this connection: is it possible to construct novel four-port circulators using such symmetrical CFL? A more general question is: Do there exist other symmetries of a CFL which will allow one to realize the nonreciprocal devices? A reply by the original authors is included.