Comments on "Uniform ferrite-loaded open waveguide structure with CRLH response and its application to a novel backfire-to-endfire leaky-wave antenna"

In the above-named paper, a transversely magnetized ferrite open-waveguide has been analyzed. That paper demonstrated that a forward-to-backward TE guided-wave transition may occur as a function of either frequency or magnetostatic bias. It further demonstrated that a scanning leaky-wave antenna may be built from such a guide. Although the rigorous analysis of the β = 0 crossing presented there is laudable, it also contains a number of shortcomings that require clarification. The purpose of this comment is threefold. First, it will be shown that pertinent references appear to have been overlooked. Second, certain strong claims that are made in the original work must be properly placed in context. Third, it will be shown that losses have been inadequately assessed.