This master's thesis describes the methodologies used for high-frequency electromagnetic analysis, focusing on the Radar Cross section(RCS), a parameter that gives information on how detectable an object is by radar. Numerous studies are still going on with the aim of reducing this parameter, since the lower it is, the more difficult it will be for a radar to detect the object in question. This problem is of great importance especially in the military sphere, since the Second World War, studies have been started on how to reduce the RCS in order to be detected as late as possible, so as to give the defence little time to respond to attacks.