New cavity perturbation technique for measuring complex permeability of ferrite materials

A cavity perturbation technique suitable for measuring magnetic parameters of ferrite materials is discussed. Rod-shaped samples or a ferrite-powder-filled capillary tube are placed at the position of maximum magnetic field in a rectangular waveguide cavity. From the shift in the resonant frequency and the Q-value, the complex permeability of the material can be evaluated. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 18: 241–243, 1998.