Coating for the concealment of objects from the electromagnetic radiation of antennas

An assembly comprising an obstacle and a device, intended to be subjected to an incident electromagnetic wave of wavelength λ, wherein:

• the obstacle is formed of an electrically conductive material and takes a substantially cylindrical shape of longitudinal axis (O;
• ez), which longitudinal axis is substantially perpendicular to a direction of propagation of the incident electromagnetic wave, said obstacle furthermore having a maximum transverse dimension d such that the ratio d/λ is less than 1;
• the device is placed over all or part of a surface of the obstacle so as to decrease a radar cross section of said obstacle, and includes:
• a sleeve of a dielectric coating, of equivalent relative dielectric permittivity εreq, of height hp, along a longitudinal axis of said sleeve, which is substantially equal to
• λ
• 2
• ⁢
• ɛ
• req
• ;
• a sleeve of an electrically conductive coating placed around the periphery of the dielectric coating, of the same height hp along a longitudinal axis of said sleeve as the height of the dielectric coating sleeve.