Experimental Consideration of RCS Reduction Using Thin Metasurface

Abstract

Recently, thin wave absorbers composed of a periodic structure of metal patches have been reported in order to reduce the radar cross section (RCS). A high value of permittivity of the substrate or a very thin substrate are required in order to achieve stable operation for absorbing frequency at oblique incident angles. This paper shows the RCS reduction characteristics of a metasurface absorber with 0.1-mm thickness. RCS reductions are found at 9.88 GHz when the incident angle is 0 deg. The experimental results indicate a 10-dB reduction at TE mode. In addition, the curved wave absorber shows similar RCS reduction characteristics to those of the flat one. This experiment yields that the proposal wave absorber is possible to be used on the body of which surface is curved.