Gradient Absorber of Electromagnetic Waves

Abstract The possibility of fabrication of a gradient absorber of electromagnetic waves with small thickness having an efficient level of electromagnetic radiation absorption in the frequency range from 10.0 to 37.5 GHz in which the reflection coefficient does not exceed –15 dB is shown. The fact of formation of a gradient behavior of the distribution of concentration of conductive filler in material from a minimum value on an external surface to a maximum value on an internal surface was revealed. It was found that the developed absorber of electromagnetic waves owing to the compacted surface layer, which is produced at a formation stage, can be used without additional metallization of internal surface, which makes it possible to simplify use of a material in designs and reduce its weight. The results of comparison of frequency dependences of the reflection coefficient of the developed electromagnetic wave absorber with materials similar in composition with uniform distribution over the volume of conductive filler are presented.