Results of numerical simulation of radiation absorption: (a) absorption coefficient (red curve) and reflection coefficient (green curve) as a function of incident radiation wavelength. Electrodynamic simulation of the newly designed metamaterial with Microwave Studio CST shows an absorption coefficient of 99.998% at 96 GHz corresponding to the wavelength λ = 3.122 mm; (b) example of detection of a triangular steel plate with leg sizes of 3 and 6 mm by a 23.4 × 23.4 mm2 sized metasurface consisting of 40 × 40 cells. The steel plate is located at a 4.7 mm vertical distance and a 0.9 mm horizontal distance from the top right corner of the metasurface. The distance between the steel plate and the metasurface is 20 mm. The electromagnetic response of the metamaterial was visualized by calculation in the Microwave Studio CST electromagnetic simulation software using the finite difference time domain method (FDTD) [36]. The simulation output data were (c) electric field magnitude in the dielectric layer, (d) magnetic field magnitude and (e) surface current density in the metallic layer. The top right corner of the metasurface exhibits a typical diffraction pattern. The screen area in front of the object shows a bright spot corresponding to the peak magnitude of the electric and magnetic fields and the highest surface current density. As one moves away from the spot center the excitation is spread over the metasurface in the form of coaxial circles with a declining intensity