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Ferrite materials have good frequency characteristics. Their relative permeability is large and relative permittivity is small. These make it suitable for matching layer and have a good application prospect in broadening the absorption bandwidth. In this paper, ferrite was prepared by a simple chemical precipitation-dehydration method, and the ferrite Fe 3 O 4  particles with 40% mass fraction were mixed with paraffin to form a ring test sample. The experimental results show that the as-prepared sample at higher temperatures has more stable nucleation and fewer defects, so it has more significant electromagnetic wave absorption performance. The minimum reflection loss is about - 44 dB, and the electromagnetic absorption band with the reflection loss RL less than - 10 dB is located at 12.5-14.1 GHz (3 mm) and 6.5-8.1 GHz (5 mm), respectively.

Preparation of Ferrite Fe3O4 and Its Electromagnetic Wave Absorption Properties

Preparation of Ferrite Fe₃O₄ and Its Electromagnetic Wave Absorption Properties