Extension of the emission measurements for alternative test methods above 1 GHz for unintentional electromagnetic radiators

The standards by CISPR and IEC describe different procedures for the measurement of the radiated disturbance of electronic equipment. However, these standards only account for measuring the maximum radiated electric field strength for a specified number of sampling points. This leads to the assumption that especially for the characteristics of unintentional electromagnetic radiators, the specified amount of sampling points is not sufficient so that the true maximum of the electric field strength might be undetermined. Therefore, stochastic approaches were derived to predict the maximum radiated electric field strength based on the total radiated power. Above 1 GHz and without using a reverberation chamber, the determination of the total radiated power is very time consuming. Hence, a new approach is presented in this paper which uses standardized sampling approaches from alternative test methods to predict the maximum radiated electric field strength from a reduced number of angles of observation. Its accuracy and applicability as an extension for the emission measurements of unintentional electromagnetic radiators is assessed.