Flexible metamaterial based microwave absorber with epoxy/graphene nanoplatelets composite as substrate

Abstract

Customization of substrates for the design of metamaterial absorbers gives the user a wide choice of parameters like flexibility, thickness, dielectric constant, etc. Polymer composites are attractive in this regard as they provide a variety of options to fabricate substrates with desirable properties depending on the matrix and filler materials. In this work, flexible polymer nanocomposites with different weight percentages of graphene nanoplatelets (GnP) in epoxy were fabricated and the dielectric characterization was performed. The presence of GnP increased the real part of the dielectric constant from 2.5 for 0 wt. % to 14.7 for 9 wt. % of the epoxy-GnP composites measured in X-band frequency. The substrate with 5 wt. % of GnP in epoxy having a relative permittivity of 7.3–j0.25 is chosen to design a metamaterial absorber, and the absorption studies are carried out numerically. The proposed absorber having a thickness of λ/22 is shown to have a maximum absorption of 99.8% at the frequency 9.88 GHz. Furthermore, an equivalent circuit model of the absorber is proposed and the analytical values of the circuit elements are determined. The metamaterial prototype is fabricated by coating metallic resonating structures on top of the flexible E-GnP5 substrate of thickness 1.4 mm by thermal evaporation. The performance of the fabricated absorber agrees well with the simulation results. These polymer nanocomposites with good flexibility, thermal stability, and optimum dielectric properties would be the future materials for developing conformal metamaterial absorbers for microwave applications.

Enhancing the microwave absorption performance of graphite/Al2O3 composites through manipulating sheet resistance

“…Calculate the performance of the reflection loss (RL) of the coating using equivalent circuit theory based on its complex permittivity. 38,39 During the calculation process, the period C is equal to 10 mm, the size b is equal to 6 mm, the sheet resistance R is equal to 120 ohm, and the thickness t is equal to 2 mm. According to transmission line theory, when an electromagnetic wave is vertically incident on an absorber of this study, the reflectivity of the absorber can be represented by equivalent circuit shown in Figure 2.…”

“…The test frequency is between 8.2 and 18.0 GHz for radar waves. Calculate the performance of the reflection loss (RL) of the coating using equivalent circuit theory based on its complex permittivity 38,39 . During the calculation process, the period C is equal to 10 mm, the size b is equal to 6 mm, the sheet resistance R is equal to 120 ohm, and the thickness t is equal to 2 mm.…”