Abstract
We address the uncertainty of reverberation chamber (RC) measurements in presence of both mechanical and frequency stirring (FS). A base-case model is derived for reverberation fields affected by the measurement uncertainty due to the lack of a perfect statistical uniformity of fields in a RC. It is found that the measurement uncertainty associated with the FS depends on both the total uncorrelated samples and the local insertion loss (IL). The local IL depends on the frequency stirring bandwidth (FSB). The model allows us for obtaining separate measurement uncertainty contributions. Measurements support the achieved uncertainty model. In particular, results show that the dependence on the IL is normally rather weak also when very wide FSBs are used.
Highlights
COMBINATION of stirring techniques, i.e., hybrid stirring, is very important for reverberation chambers (RCs) as it increases the number of uncorrelated samples and, it reduces the measurement uncertainty [1]-[15]; it facilitates the development of applications for RCs [1]-[16]
The insertion loss (IL) measurement is considered; the results can be extended for different measurements made in an RC [12]-[13] or for measurements obtained by a combination of ILs
We have shown a base-case model for the uncertainty of measurements made in an RC, which can be used when hybrid mechanical and frequency stirring are used, as well as when only mechanical stirring (MS) is adopted, see (20)
Summary
COMBINATION of stirring techniques, i.e., hybrid stirring, is very important for reverberation chambers (RCs) as it increases the number of uncorrelated samples and, it reduces the measurement uncertainty [1]-[15]; it facilitates the development of applications for RCs [1]-[16]. It is specified that when the physical quantity to be measured is not constant through f, the model includes the measurement uncertainty due to the fact that the value of the IL may not correspond to the value of IL at central frequency f0 [20]; that is, the result is given as an average value in f. The paper is organized as follows: in section II the theory is shown; in section III, experimental results are shown; in section IV, results are discussed and conclusions are drawn
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