Performance of the Reflectivity Measurement in a Reverberation Chamber

Abstract

Abstract-The reflectivity measurement of materials is an innovative application of a reverberation chamber (RC). In this paper we show an analysis of the performance of the reflectivity measurement in an RC in terms of uncertainty of measurement and relevant noise level. The model for reflectivity measurement, which is already present in literature, is based on the absorption cross section (ACS) measurements. If the ACS measurements are averaged with respect to the configurations of the measurement system, then the relevant uncertainty depends only on the number of independent samples. Here, the performance of the reflectivity measurements is shown in cases where it depends only on the number of independent samples acquired in an RC. Simulations and measurements confirm the validity of the expected results.

Latest developments on the shielding effectiveness measurements of materials and gaskets in reverberation chambers

“…6-9 as shown in the corresponding captions. It is also specified that the MDR-SE given by (20) or equivalently (21), which does not include the leakage of the fixture, is not shown in such figures; it is always greater than or equal to the reference measurement from a metallic plate, as it will be also seen in Fig. 10 below.…”

“…10 are shown five traces. The black-coloured trace represents MDR-SE given by (20) or equivalently (21), which are equivalent to (22) in this case; it does not include the leakage of the fixture. The violet-coloured trace represents the reference measurement of the measurement setup.…”

“…For symmetrical samples from the point of view of the reflectivity, the implication IL o, o, s ≅ IL o, o, pec ⇒ IL fixt, s ≅ IL fixt, pec could be used even though it becomes practically weak for apertures physically very small and very large outer chamber. Finally, a preliminary absorption measurement [1,[14][15][16][17][18][19][20] or a preliminary reflectivity measurement could be made [21]. The condition (1) is necessary only to achieve IL fixt, pec by the SE of the fixture (enclosure) with no sample in the aperture, which in turns allows the SE of the sample to be obtained by using a single antenna in the fixture when the condition (b) is also met, as further specified in the next section.…”

“…The MU includes both systematic and random errors [30]. The MU for SE can be calculated from each measurement model, by considering the MU of the single parameters in it included, as shown in [21,[31][32][33][34] for quantities different than SE. In [35,36], the MU of the IL including FS and statistical non-uniformity is also shown.…”

“…The gasket is a non-woven fabric. Also, MDR is determined; it is obtained by (20) or equivalently (21). The SE of the gasket is obtained both by SE 5 (9) and [10, (1)].…”