Enhanced Microwave Absorption Bandwidth in Aluminium-Encapsulated Iron Particles Fabricated with Magnetic Field of Rotating Permanent Magnets

Composite materials are becoming very promising and important tools in specific areas of construction, aerospace and aircraft industries. Microwave absorption materials are one of the most important types of composites used in electronic devises nowadays. Magnetic field of rotating permanent magnet method was used to obtain an absorbing composite material based on Fe-Al particles. Material - absorber with enhanced microwave absorption bandwidth was obtained. As the main characteristics, the reflection, absorption and attenuation spectra of the electromagnetic radiation of Fe-Al composites were obtained and analyzed. Reflection characteristics of Fe-Al composite materials using MFRPM method were improved. As a result, the Fe-Al composite shows the best microwave absorption performance, with the strongest reflection loss of -28.0 dB at 11.9 GHz and the effective bandwidth can cover the frequency range of 8.0– 12.4 GHz with the thickness of 5 mm. Obtained results demonstrates high perspectives of composite materials based on magnetic field of rotating permanents magnets method.