Calibration of electrical field probes in a reverberation chamber

Purpose and goal

The aim of the project was to develop a method for calibrating electric field probes in reverberation chamber. A method, with associated measurement uncertainty, has been developed and tested. Also instrument control software and data processing software have been designed and completed. the frequency range is 1-18GHz, but possible expansion are suggested. Publication of method is supposed to take place at the appropriate instance.

Expected results and effects

Results indicates that with calibration in a reverberation chamber, calibration factors can be obtained in a simple and reliable way. This has the improved effect compared to today´s methods whose results vary depending on the orientation of the probe without adversely affecting accuracy. The simplified measurement method also results in increased accessibility, since a reverberation chamber is cheaper than a fully anechoic chamber, where most calibration take place today.

Planned approach and implementation

The calibration is carried out in such a way that you first measure what the current status of the chamber is. Then you switch to the test object to measure the response of the test object at a known applied electric field. In the following calculation, both the total calibration factor of the probe as well as a factor for each individual axis can be determined. This provides a simple implementable method, with relatively few restrictions on the used equipment, with a measurement uncertainty of about 0.8 dB