Electromagnetic Properties and Impedance Matching Effect of Flaky Fe–Si–Al/Co2Z Ferrite Composite

Abstract

Fe–Si–Al/Co2Z ferrite composites were prepared by ball-milling. The microstructure, microwave electromagnetic properties, and impedance-matching performance of a series of composites were determined and the results are discussed. Experimental results indicated that, in frequency range 1–18 GHz, the permittivity and permeability of the complexes can be adjusted by changing the Fe–Si–Al-to-Co2Z weight ratio. Calculated reflection losses indicate that the absorption performance of Fe–Si–Al/Co2Z ferrite composites is superior to that of the pure Fe–Si–Al and Co2Z ferrites. It was found that the impedance-matching performance of the materials, which contributes to perfect absorption, can be improved by use of an appropriate weight ratio for the Fe–Si–Al/Co2Z ferrite composite.