Comparison of Electrical Field Strength Measurements above 1 GHz

Project Description

The objective of the project is to compare the standards of electromagnetic field strength as realised in the participating laboratories. The frequency range is from 1 GHz to 2.5 GHz.
The traveling standard involved in the comparison will be the field strength meter system TFS 11 (Schaffner MEB Berlin).
The measurement will be performed in a similar way as in the comparison CCEM.RF-K20. The field strength should be adjusted for defined probe reading at following frequency points: 1 GHz, 1.25 GHz, 1.5 GHz, 1.75 GHz, 2 GHz, 2.25 GHz, 2.5 GHz.

Final Report 2011-03-01

The project has been completed and results are published in the KCDB.

An international comparison of electric field strength in the frequency range (1 to 2.5) GHz has been carried out among 10 laboratories. The parameter compared was the field strength appropriate for the circulated field strength meter indication of 20 V/m. Basically, four types of calculable field strength realisations were used (rectangular waveguide, small TEM cell, reference transmitting antenna, reference receiving antenna). Some of the reported values obtained in anechoic chambers by using reference transmitting antennas (“standard field method”) and in TEM cells are inconsistent with the claimed uncertainties. A good agreement between measurements in waveguides and (consistent) measurements in anechoic chambers was observed.