Corrugated waveguides supporting left-hand propagation were investigated in [1], [2] using an equivalent circuit model for the unit cell to derive an approximate dispersion relation and determine the scattering characteristics of finite sections of such structure. In [3], the corrugated surface was viewed as a periodic structure and thus the use of Floquet theorem was made along with a Galerkin projection procedure to obtain accurate expressions for the field distribution and the dispersion equation of the one-walled corrugated waveguide. For sufficiently electrically small period, the asymptotic corrugation boundary conditions (ACBCs) provide solutions with good accuracy while taking into account the effect of the corrugation width-to-period ratio [4]. The analysis can be also extended from the one-walled to the two-walled corrugated waveguide case. This paper focuses on the latter case with emphasis on the special case of identical corrugations on both walls. The dispersion characteristics as well as the even and odd modes are studied.
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