Uncertainty of validating semi-anechoic chambers for radiated emmision measurement

Abstract

The uncertainty evaluation is made for validating a semi-anechoic chamber with the reference site method evaluation. More uncertainty sources are considered, and the uncertainty value is evaluated accordingly. The details for the uncertainty from the vector network analyzer, from the imperfection of the reference test site, as well as from the radiation pattern are provided in briefly. As for the radiation pattern, some comparison is made between the results with biconical antennas and that with broadband calculable dipole antennas. The uncertainty value is depended on the frequency and the antenna type (directional or omni-directional), as well as on the polarization. The data in this paper are acquired based on careful measurements and precise metrological techniques.