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

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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.

Inspec keywords: waveguide theory; dispersion (wave); ferrite-loaded waveguides; magnetisation; finite element analysis; losses; coplanar waveguides

Other keywords: dispersion characteristic; edge elements; transverse magnetisation; rectangular waveguide; phase constants; Landau-Lifshiz damping term; attenuation constants; ferrite-loaded waveguides; magnetic losses; ferrite layer; waveguides; finite element method; longitudinal magnetisation; coplanar waveguide; lossy ferrite

Subjects: Waveguide and cavity theory; Microwave magnetic devices; Finite element analysis; Waveguides and microwave transmission lines

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