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Calculation of phase and attenuation constants for waveguides loaded with lossy ferrite with longitudinal or transverse magnetisation

Calculation of phase and attenuation constants for waveguides loaded with lossy ferrite with longitudinal or transverse magnetisation

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In the paper, a finite element method with edge elements for directly calculating the phase and attenuation constants of ferrite-loaded waveguides with longitudinally or transversely magnetised directions is presented. The magnetic losses of the ferrite are included in the form of a Landau–Lifshiz damping term. Dispersion characteristics with attenuation of a rectangular waveguide loaded with a ferrite slab are in very good agreement with the analytical results, which confirms the correctness of the method. The analysis for a coplanar waveguide with a ferrite layer is also carried out. The calculation shows that a larger differential phase shift and lower attenuation can be achieved with transverse magnetisation than with longitudinal magnetisation at higher frequencies.

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