Waves in irregular rectangular waveguide with inhomogeneous anisotropic impedance of wall

In the present paper we theoretically consider coupling of transverse electric waves TE_n,0 and TE_0,m, propagating in a rectangular waveguide formed by planes x=0,R and y=0,L. The wall with y=0 is supposed to have frequent and not deep corrugation and a thin magnetized ferrite film on it. Such a surface may be approximately described by small anisotropic surface impedance. Diagonal elements of impedance tensor w are caused by gyrotropy of transversally magnetized film and by a tilt of corrugation relative to longitudinal axis