High-precision measurement equipment for EMC antenna calibration

The article formulates the problems of antenna calibration used for testing for electromagnetic compatibility.It is noted that the apparatus and calibration methods of test antennas existing in the Russian Federation do not allow for an effective achievement of EMC test goals, primarily due to high uncertainties of their antenna factor. To achieve the required accuracy of measurements of antenna characteristics and, as a result, electromagnetic compatibility parameters a High-precision measurement equipment for EMC antenna calibration are presented. The application of this equipment allows not only to carry out high-precision measurements of the characteristics of radiated industrial radio interference, but also to implement three classical methods of antenna measurements over a metal ground plane in a large semi-anechoic shielded chamber, as well as a method of measurements at close distances. Based on these methods, algorithms and methods for measuring the characteristics of antennas and antenna calibration test sites have been developed. The main results of the development are presented, including the results of experimental studies of the functionality and metrological characteristics of the measurement system using the example of precision resonant dipoles. The results obtained will be used to create the technical basis for a system to ensure the uniformity of measurements of the characteristics of antennas used for electromagnetic compatibility tests. The developed large polygonal semi-anechoic chamber can be considered as a reference test site of the Russian Federation and in the CIS countries, including during interlaboratory comparison tests.

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