THE MICROWAVE ABSORBING PHENOMENA OF FERRITE MICROWAVE ABSORBERS

The complex permeability dispersions and the microwave absorbing phene mena are investigated in ferrite microwave absorbers. The complex perm eability of hexagonal(Y- and Z-type) and spinel(NiZn ferrite and NiZnC o ferrite) ferrites microwave absorbers were measured in 200MHz-16GHz range. The theoretical matching frequencies are determined by plotting the measured complex permeability loci on the impedance matching solu tion map. One or two impedance matching phenomena are observed in the ferrite absorbers according to their complex permeability loci on the impedance matching solution map. It was discovered that the 1st matchi ng frequency(f(m1)) of the ferrite absorber strongly depends on its sp in resonance frequency(f(r2)) and the 2nd matching frequency(f(m2)) is independent of the resonance frequency.