Development of Novel Electromagnetic-Wave-Absorber of SiC-Ferrite Hybrid Materials

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First, We firmed the experimental technique and evaluation of the electromagnetic properties concerning with wave-absorption by using an network analyzer for frequency range from 100MHz to 10GHz. Next two different types of novel sintered composites of Ni-Zn ferrite SiC were first succeeded to prepare as an electromagnetic-wave-absorber through a soft chemical technique and subsequent tow different manners of sintering : a two-step sintering and an one-step sintering. Amorphous SiC particles with an average diameter of approximately 30 μm dispersed uniformly in Ni-Zn spinel ferrite matrix. In the two-step-sintering method, the density of the composite decreased continuously as the amount of SiC increased. The absorption characteristics of the sintered composite were found to depend upon the amount of SiC particles. The center frequency of the absorption shifted toward higher frequency around 2GHz. Furthermore in the one-step-sintering method, we first succeeded another new electromagnetic-wave-absorber having interesting wave-absorption properties with the two different center frequencies of about 800MGz and 8.6GHz.