Optimisation of carbon-reinforced absorbing composites for X and Ku bands

This paper presents applicability of the finite-difference time-domain method supplied with optimisation techniques to a tuning of multi-layer Salisbury absorbing screens with carbon-reinforced polymer composites. Maxwell-Garnett model is applied to represent the effective complex permittivity of a dilute conductive mixture below the percolation threshold and Debye dispersive model is utilized to implement the obtained permittivity in the FDTD simulation. Two examples are computed to show that substantial improvement of the absorbing performance can be achieved by tuning the appropriate knobs.