Vibrating Intrinsic Reverberation Chambers for shielding effectiveness measurements

Abstract

A new technique for shielding effectiveness measurements is the dual VIRC method. In this method two Vibrating Intrinsic Reverberation Chambers (VIRC) are combined together via a common wall with an aperture that forms the interface between them. This particular set-up makes it possible to achieve a very high dynamic range. Advantage of this technique compared to the nested reverberation set-up is that measurements can be conducted much faster and at much lower frequency. Several different approaches to determine the shielding effectiveness are presented. It has been shown that multiple interactions play a role in the particular set-up.

Shielding Effectiveness Tests of Low-Cost Civil Engineering Materials in a Reverberating Chamber

“…4 shows the SE values obtained from the CCM after the evaporation process is completed. As expected, the SE values are considerably lower than the first one, with a maximum value equal to 2 dB around high frequencies (14)(15)(16)(17)(18). It is important to note that in order to verify the uncertainty related to the repeatability of the proposed procedure, measurements of the CCM have been evaluated, removed from setup, reinserted and evaluated again.…”

“…The IEC 61000-4-21 standard [9] describes a particular approach to use the RC, the nested RCs approach, i.e., a smaller RC within a bigger RC, for measuring the SE of materials. Different research groups apply this technique to evaluate the SE of civil engineering materials [10][11][12][13][14]. The first formulation for the SE of the material under test (MUT) proposed in [10] has been improved during the years by considering new effective procedures which overcomes the drawbacks of the earlier ones.…”

“…1). Since in this case the aperture is a whole wall of the fixture, SE will essentially go to zero (dB scale) with no sample in the aperture [9], and its behaviour approximates that of two contiguous chambers with one side in common [13,14].…”

“…The RC is an isotropic multipath environment that better represents the real life environments where the fields are incident on the MUT with different polarizations [10][11][12][13][14][15]. In this paper, the RC is first employed to evaluate the SE of shields made with several civil materials having different mechanical properties.…”

“…Several experimental, analytical and numerical techniques to model civil materials for EMI interferences by evaluating their SE have been developed [6][7][8][9][10][11][12][13][14].…”