On the role of magnetization and dielectric polarization currents in the excitation of high-frequency oscillations in a gyromagnetic transmission line: numerical modeling

Abstract

The formation of a high-frequency electromagnetic pulse in a transmission line, partially filled with saturated ferrite surrounded by insulating dielectric, fed with a nanosecond-risetime high-voltage pulse, is studied in a numerical experiment based on solving the Landau–Lifshitz equation along with Maxwell’s equations. The ferrite dielectric properties are taken into account in a constant-permittivity approximation. An analysis of the energy exchange of the electromagnetic wave with the magnetization and dielectric polarization currents in the ferrite demonstrates that the energy is primarily transferred through the magnetization current wave. The role of the dielectric permittivity of the gyromagnetic medium, which is much higher than that of the surrounding dielectric, consists mainly in slowing down the wave, ensuring an effective excitation of gyromagnetic precession at the pulse front and its steepening.