Microwave Absorbers Based on Aluminum Shavings

The aim of the research work, the results of which are presented in the current paper, was experimental substantiation of the prospects of aluminum shavings using to obtain new cost effective microwave absorbers of the metamaterial type. To achieve the aim, the following objectives have been solved: 1) manufacturing the samples based on aluminum shavings and binder (samples differed by the volumetric ratio of the aluminum shavings and binder: 10.0 %: 90.0 %,30.0 %: 70.0 %, 50.0 %: 50.0 %.); 2) measuring electromagnetic radiation reflection and transmission coefficients values in the frequency range 0.7-17.0 GHz of the manufactured samples; 3) calculation electromagnetic radiation absorption coefficient values in the frequency range 0.7-17.0 GHz of the manufactured samples; 4) conducting the comparative analysis of frequency dependences of electromagnetic radiation reflection, transmission and absorption coefficient values of the manufactured samples. In course of the objectives solving the optimal volumetric ratios of the aluminum shavings and binder in the studied microwave absorbers were established. Such ratios correspond to the maximum possible values of electromagnetic radiation absorption coefficient and effective absorption band of these absorbers. These ratios are 30.0 %: 70.0 % and 50.0 %: 50.0 %. The studied absorbers characterized by the indicated volumetric ratios of the components are multi band ones. Their electromagnetic radiation absorption coefficient values in the frequency range of 0.7-17.0 GHz achieves value 0.9. Their maximum width of the effective absorption band in the specified frequency range is 10.0 GHz. The presented absorbers could be used for protection radio electronic devices from active and passive electromagnetic interferences.