paper 150120031354

Abstract

Ferrite plate/varactor-loaded conductive resonance elements (chains or single el- ement) metastructures are investigated experimentally in waveguide to achieving voltage con- trolled inversion of sign of the nonreciprocity δ of microwave propagation. Dipoles of various shapes (butterfly, loop, snake, double split rings) with different type-varactors have been inves- tigated. The metastructures show unique magnetically and electrically controlled nonreciprocal effects under coupled ferromagnetic resonance (FMR) in ferrite and resonance in dipoles (DR). Inversion of sign of δ occurs by the application of a bias voltage to a varactor when resonance frequency of DR passes through the FMR frequency as a result of which reversal of sense of rotating elliptically polarized h-field takes place. Usually inversion of nonreciprocal propagation of microwaves in ferrite is implemented by reversal of magnetization direction as a result of which reversal of sense of spins precession occurs.

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Yuri N. Kazantsev

Valery S. Butylkin

Galina A. Kraftmakher