THE MICROWAVE ABSORBING AND RESONANCE PHENOMENA OF Y-TYPE HEXAGONAL FERRITE MICROWAVE ABSORBERS

The microwave absorbing characteristics and resonance of Y-type hexago nal ferrite-rubber composites were investigated. The complex permeabil ity and permittivity of Ni2-xZnxY ferrite bodies were measured using a network analyzer in the frequency range of 200 MHz-14 GHz. Two types of resonance, the domain wall and the spin rotational resonance, were observed. With a ferrite particle with a diameter of about 1 mum, only spin rotational resonance was observed. The first matching frequency, found in the ferrite-rubber composites, which was higher than that of spin rotational resonance, increased with spin rotational resonance f requency. It was also found that domain wall resonance had no effects on the microwave absorbing characteristics. Based on these findings, i t could be concluded that the microwave absorbing characteristics were caused by only one type of resonance, the spin rotational resonance.