Radar cross section reduction using perforated dielectric material and plasma AMC structure

Abstract

This paper investigates three approaches for radar cross section (RCS) reduction from the perfect electric conductor (PEC) plate. The first approach employs a graded perforation holes in one direction of the dielectric sheet loaded on a PEC plate. The perforation technique is used to alter the dielectric constant of the sheet. The RCS reduction is achieved for different scaling coefficients for the hole radii at 11.75 GHz with wide reduction angle. The second approach employs perforation on both directions of the dielectric sheet. The dielectric sheet is virtually subdivided into 13×13 block each one includes four identical holes. The effect of varying the focal position of the dielectric sheet on the reduction of the RCS has been investigated. The third approach employs the plasma artificial magnetic conductor (AMC) to reduce the RCS from the PEC. The effect of changing the dispersive properties of the plasma material on the AMC and on the RCS responses are investigated. A full-wave simulation using the finite integration technique (FIT) is depicted to study the proposed structures.