A simplified analysis of ferrite strip

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Abstract
Previously, one of the authors proposed a ferrite strip as a non reciprocal waveguide for millimeter and optical waves. It has many features, e.g., it does not require metal conductors and optical anisotropic material (NbO3), and it generates large field displacement for small anisotropy.This type of waveguide is analyzed by a generalized transmission equation and variational method. These methods, however, are time‐consuming and cumbersome. This paper proposes a simple analysis method using effective permittivity. The field distribution for weakly guiding waves and the radiation characteristics are discussed in detail. It is clear that the occurrence of large field displacement is attributable to weakly guiding waves. The cut‐off condition for the fundamental wave, the condition of edge guide wave generation, the radiation loss and the asymptotic value of the field displacement, are clarified.

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