Targets with plasmonic coatings for RCS calibration tests

In anechoic chambers, the quality of RCS measurements is limited by couplings with the walls. In this work new calibration targets are introduced to assess these couplings. The idea is to get null monostatic RADAR Cross Section at some desired frequency by designing suitable plasmonic coatings. Such coatings are obtained on a metallic object by performing periodic grooves. They are thus an interesting alternative to standard RADAR Absorbing Materials whose constitutive parameters are not always well-known. Under a rotational symmetry assumption, very accurate RCS computations are possible up to several tens of GHz.