Get 167-2021 State Primary Standard of the Unit of Power of Electromagnetic Oscillations in the Frequency Range from 37.5 to 118.1 GHz

Issues related to measuring the radio frequency (RF) power as the main parameter characterizing the intensity of electromagnetic radiation at microwave frequencies in closed transmission paths are considered. RF power measurements within the mm-wavelength range are widely used in radio communications, radio navigation, and radiolocation. In order to ensure the uniformity of RF power measurements within the frequency range of 78.33–118.1 GHz, GET 167-2017 State Primary Standard of the unit of power of electromagnetic oscillations in waveguides within the frequency range from 37.5 to 78.33 GHz was improved. To this end, the upper frequency limit of GET 167-2017 was extended by developing a set of bolometric converters in 2.4 × 1.2 and 2.54 × 1.27 mm (WR10) waveguides, as well as calorimeter and comparator systems. A schematic representation, technical characteristics, and results of metrological studies on GET 167-2021 State Primary Standard of the unit of power of electromagnetic oscillations in the frequency range from 37.5 to 118.1 GHz are provided. Taking the effect of the reduced waveguide cross-section into account, procedures for estimating error components associated with realizing and transferring the RF power unit were revised. The study results confirmed the high accuracy of the standard, which now occupies a leading position among similar national standards.