EIGENFREQUENCIES REPULSION OF MAGNETODYNAMIC MODES IN MAGNETIZED FERRITE RESONATORS FOR MILLIMETER WAVEBAND

 

N. N. Movchan, M. A. Popov

Taras Shevchenko National University of Kyiv

The paper is received on December 26, 2013

Abstract. In the paper the repulsion of the magnetodynamic modes resonant frequency in the ferrite disc-shaped and rectangular parallelepiped-shaped millimeter band resonators have been investigated. In particular, the initial repulsion of magnetodynamic modes eigenfrequencies at low magnetic fields was studied both theoretically and experimentally. From numerical calculations using the HFSS software package it was found that for the current experimental conditions the predominant cause of the resonance frequencies initial repulsion in the disk-shaped ferrite resonator is the distortion of the cylindrical symmetry of the electromagnetic field around the resonator when it is placed as inhomogeneity inside the waveguide. A method was proposed to control the magnitude of the resonance frequencies initial repulsion of the ferrite rectangular parallelepiped-shaped resonator by changing the shape of the resonator. The possibility of reducing the resonance frequencies initial repulsion from 1 GHz to 400 MHz and increasing the magnitude steepness of the frequency vs. field dependence of the YIG resonators in low fields (~ 100-200 Oe) from 0.5 MHz/Oe to 1 MHz/Oe was experimentally demonstrated.

Keywords: ferrite resonator, magnetic tuning, magnetodynamic modes, yttrium iron garnet.