The areas of propagation in the r_0 -β - phase plane, the β(r_0) - phase characteristics and the lower and upper cut-off frequencies (the lower and upper normalized critical guide radii r_(0cr) and r_(0en±), resp.) of the circular waveguide, containing a thick latching ferrite cylinder, magnetized azimuthally to remanence, surrounded by a thin dielectric toroid, are studied for the normal T E_(01) mode, assuming equal values of the relative permittivities of both strata, (r_0 and β - the guide radius and phase constant, normalized with respect to the frequency and relative permittivity of anisotropic filling. "+" and "-" - subscripts, labeling quantities, relevant to positive. resp. negative direction of its magnetization). The principle outcome of the investigation is that the removal even of an insignificant part from the ferrite in the vicinity of the wall and its replacement by an isotropic medium changes substantially the phase behaviour of the configuration, compared to the case in which it fills in the whole transmission line, inspected earlier. This is visible for both signs of ferrite magnetization, but especially noticeable if its sign is positive (counter-clockwise). Besides, the alteration of the size of outer layer, of its permittivity, keeping that of the inner one the same and of the direction of magnetization of the ferritc load, are the most important factors that determine the position, boundaries, shape and dimensions of the region in the phase plane in which the wave might be sustained, as well as the distribution of its two kinds of cut-off frequencies (the critical radii).
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