Abstract
The effect of different loading profiles of a conductive nanofiller on the electromagnetic absorption of a gradient nanocomposite (NC) absorber is studied. First, the relative permittivity of a polymer matrix loaded with different contents of the conductive nanofiller is obtained using a theoretical model and experimentally measured data. Then, gradient NCs in which the concentration of the filler and the intrinsic impedance modulus form linear, exponential, and triangular profiles are considered and their return loss, with backed metal plates, is calculated. It is found that the gradient NC with a triangular impedance profile provides the lowest reflection over the widest bandwidth.
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