Far field versus Near field measurement in Automotive environment

The electronic products designed for commercial use must satisfy international Electromagnetic Compatibility (EMC) standards. The radiated emissions (RE) measurement is one of the tests that are mandatory in a full qualification stage in order to validate an electronic product for series production. This paper is a practical approach to help the engineers working in the EMC automotive area find the area with problems from their project layout. We present results obtained in a semi-anechoic chamber (standardized far field test) in comparison with a nearfield scanning technique. The magnetic near-field data are measured by using EMSCAN system and acquired data are used for finding the the source of emissions. In far field we use: a measuring receiver and radiated emissions antennas: monopole, biconical, log-periodic and horn, but in this case we do not have information about the source of emissions.