With the rapid development of wireless communication technologies and the miniaturization trend in the electronics industry, the reduction of electromagnetic interference has become an important issue. To solve this problem, a lot of attention has been focused on polymer composites with combined functional fillers. In this paper, we report a method for creating an acrylonitrile butadiene styrene (ABS) plastic composite with a low amount of conductive carbon and magnetic fillers preparation. Also, we investigate the mechanical, thermophysical, and electrodynamic characteristics of the resulting composites. Increasing the combined filler amount in the ABS composite from 1 to 5 wt % leads to a composite conductivity growth of almost 50 times. It is necessary to underline the temperature decrease of 5 wt % mass loss and, accordingly, the composite heat resistance reduction with an increase in the combined filler from 1 to 5 wt %, while the thermal conductivity remains almost constant. It was established that electrodynamic and physical–mechanical characteristics depend on the agglomeration of fillers. This work is expected to reveal the potential of combining commercially available fillers to construct effective materials with good electromagnetic interference (EMI) protection using mass production methods (extrusion and injection molding).

A transmission line measurement method for measuring the permittivity of a material when exposed to chemically aggressive media is presented. The estimation of the measurement error of the permittivity for a sample with known parameters is carried out. The reference permittivity is measured with the resonance method. It is shown that after the influence of an external chemically aggressive environment on the material, a change in its electrodynamic parameters is observed. The measured material has a permittivity close to the reference sample. The resulting change in the dielectric constant exceeds the calculated value of the error, which allows us to conclude about the accuracy of the measurements.