Utilizing Gain Interpolation for the Removal of Near-Field Coupling Effects during EMC Antenna Calibrations

Authors: Dennis Lewis, Vince Rodriguez, Sandra Fermiñan Rodríguez

Antenna calibrations for EMC emissions and immunity measurement require gain characterization at reduced distances. The current standards for EMC antenna calibrations do not address the near-field antenna-to–antenna interactions that are present during calibration at these reduced distances. These interactions are not present when using these antennas to measure a device and can result in large measurement errors. Extrapolation measurements have been used for many years to measure the far field gain of antennas at reduced distances. This paper uses both computations and measurements to show how the use of interpolation results in a more accurate assessment of antenna gain at distances required for EMC antenna calibrations.

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