Synthesis and electrical characterization of “carbon particles reinforced epoxy-nanocomposite” in Ku-band

The objective of this research work is to study the electrical characteristics of the carbon particles reinforced polymer. Ranking of different matrices was done and Carbon Black-CB nanosized particles in different weight ratios are dispersed in epoxy resin. Subsequently, each mixture is coated onto the Aluminum base plates. The Scattering parameters (S11, S21), dielectric properties and the dissipation factor of energy are measured in the Ku-band (11–18 GHz) frequency range by using Vector Network Analyzer. Good results are observed for the Carbon Black 2% epoxy (CB2-Epoxy) combination in the Ku-band. Beyond this loading, the trend reverses and it is observed that for higher doping, the attenuation level is on the decline. The experimental results show that both the real and imaginary parts of the complex permittivity of the composites are proportional to the filler concentrations. The increasing rates of the real and imaginary parts with respect to the filler concentrations vary with different frequencies. These different rates may have far reaching implications on designing the thickness in scheming of the single-layer microwave absorbers.

► Percolation network forms for CB1 and CB2.
► The thickness of the fabricated coating ranges from 0.27–0.54 mm.
► The maximum reflection loss magnitude for the mentioned thickness is 9 dB.
► The maximum power absorbed is 87%.