Investigation of microwave generation modes of nonlinear transmission lines based on microwave and low-frequency ferrites

Abstract

A comprehensive analysis of the physical processes occurring in high-voltage nonlinear ferrite transmission lines in the microwave generation mode is presented. The nonlinear lines of the coaxial type, based on the microwave ferrite rings with different combinations of the magnetic parameters and hysteresis loop shapes, have been investigated for this purpose. A complex comparative analysis of the dependence of microwave generation modes on the magnetic properties, the length of the ferrite ring assembly, and the magnitude of the external bias field enables the processes observed in the nonlinear ferrite lines to be related to the properties of the spin waves. The proposed new approaches make it possible to associate, in the most complete and harmonious way the specific manifestation of the ferrite properties under the condition of ferromagnetic resonance in the oscillation modulation mode, with the classical statements of the theory of ferrites that refer to the relaxation processes involved in the propagation mode of powerful microwave (high alternating magnetic fields). The microwave generation modes observed for the first time and a detailed analysis of their efficient implementation are discussed. In addition, a promising frequency analysis based on the wavelet transform is proposed. The experimental data obtained indicate that microwaves can be generated in the absence of an external biasing field. The effect of secondary modulation with a frequency ∼10 times that of the main oscillations also was discussed. The findings of the study have a great potential as a basis for a wide range of further research and may, therefore, be of interest to researchers engaged in a variety of fields.