Interaction of Electromagnetic Waves with Two-Dimensional Metal Covered with Radar Absorbing Material and Plasma

A two-dimensional metal model is established to investigate the stealth mechanisms of radar absorbing material(RAM)and plasma when they cover the model together.Using the finite-difference time-domain(FDTD)method,the interaction of electromagnetic(EM)waves with the model can be studied.In this paper,three covering cases are considered:a.RAM or plasma covering the metal solely;b.RAM and plasma covering the metal,while plasma is placed outside; e.RAM and plasma covering the metal,while RAM is placed outside.The calculated results show that the covering order has a great influence on the absorption of EM waves.Compared to case a,case b has an advantage in the absorption of relatively high-frequency EM waves(HFWs), whereas case c has an advantage in the absorption of relatively low-frequency EM waves(LFWs). Through the optimization of the parameters of both plasma and RAM,it is hopeful to obtain a broad absorption band by RAM and plasma covering.Near-field attenuation rate and far-field radar cross section(RCS)are employed to compare the different cases.