Isolators based on surface waves of Hno type in a rectangular waveguide containing a transversely magnetized ferrite

A solution is presented for propagation of H_no waves in a rectangular waveguide containing a transversely magnetized ferrite plate on one of the sides; the equation for the propagation constant has been solved numerically. Waves of surface type are found to accompany the waveguide type under certain conditions; the calculations define the conditions for these to occur and those for unidirectional propagation. This latter feature in the surface waves is used to design an isolator based on field bias.