Microwave generation modes of ferrite nonlinear transmission lines up to 20 GHz

Abstract

The generation modes of high-voltage microwave oscillations of nonlinear coaxial transmission lines filled with NiZn ferrite rings with an ordinary (smoothed) hysteresis loop and MgMn ferrite rings with a rectangular hysteresis loop are presented for comparison. Results across a wide frequency range (∼5.5–12.7 GHz) demonstrated that the anisotropic magnetic properties of ferrite with a rectangular loop provide a much more stable and effective generation of powerful microwave oscillations with peak amplitudes up to −350 kV and deep modulation in a wide biasing field (∼4–85 kA/m), as well as the possibility of a generation mode without an external biasing field. New experimental data enable the observed processes in nonlinear ferrite lines to be related to the theoretical positions of the ferrite anisotropic properties and the spin waves of magnetization precession under high-power microwave radiation. Results were also considered in relation to the theory of ferrite. The possibility of achieving an effective frequency of oscillations of 18.5 (up to 20) GHz using solid-state nonlinear transmission lines was also shown.