2004 - Chamber Influence Estimation for Radiated Emission Testing in the Frequency Range of 1 GHz to 18 GHz
A. Kriz, W. Müllner: 2004 Int. Symposium on Electromangetic Compatibiliy, 9.-13.08.2004; Piscataway, NJ, USA, IEEE, p. 760-765
The paper presents a comprehensive analysis of the behavior of anechoic chambers in the frequency range from 1 GHz to 18 GHz. Numerical simulation and statistical analysis have been used to estimate the influence of the test site to radiated emission results above 1 GHz. For typical EMC chambers the influence factor is around 0.7 dB. This factor can be improved by using better absorbing material or increasing of chamber size. For a wide range of EUT’s the compliance uncertainty can be estimated using the chamber influence factor. The prediction of the chamber influence for small omnidirectional EUT’s fits very well. Small EUT’s with a directive disturbance source are overestimated. Large EUT’s with multiple sources have not been investigated.