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1 results

  • Radar Cross Section Reduction of a Cavity in the Ground Plane

  • Gang Bao, Jun Lai
  • Journal:
    Communications in Computational Physics / Volume 15 / Issue 4 / April 2014
    Published online by Cambridge University Press:
    03 June 2015, pp. 895-910
    Print publication:
    April 2014

  • This paper investigates the reduction of backscatter radar cross section (RCS) for a rectangular cavity embedded in the ground plane. The bottom of the cavity is coated by a thin, multilayered radar absorbing material (RAM) with possibly different permittivities. The objective is to minimize the backscatter RCS by the incidence of a plane wave over a single or a set of incident angles. By formulating the scattering problem as a Helmholtz equation with artificial boundary condition, the gradient with respect to the material permittivities is determined efficiently by the adjoint state method, which is integrated into a nonlinear optimization scheme. Numerical example shows the RCS may be significantly reduced.