Research on equivalent electromagnetic parameters of the composite media by PSO and NRW methods

In order to achieve absorbing electromagnetic wave well, absorbing material usually is a composite media. Then equivalent electromagnetic parameters of composite medium should be reconstructed, so that optimum design of absorbing material can be achieved. This paper analyses the model foundation of composite material by FDTD method in detail. The reflection coefficient and scattering parameters of composite material are computed by FDTD. At the same time, The equivalent parameters of composite material are reconstructed by particle swarm optimization (PSO) algorithm and Nicolson-Ross-Weir(NRW) and using scatter parameters. Finally, the results of this two methods compared the experience method are accurate.