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High-Frequency Estimation of Shielding Effectiveness Without Inner Sensor in Reverberation Chambers | IEEE Journals & Magazine | IEEE Xplore

High-Frequency Estimation of Shielding Effectiveness Without Inner Sensor in Reverberation Chambers


Abstract:

The purpose of this article is to present a new method for measuring the shielding effectiveness (SE) of enclosures without the use of an internal sensor. This technique ...Show More

Abstract:

The purpose of this article is to present a new method for measuring the shielding effectiveness (SE) of enclosures without the use of an internal sensor. This technique uses a reverberation chamber (RC) and relies on the ability to accurately estimate the Q-factor as a function of frequency under different load conditions using an electromagnetic absorbing material. This material is placed successively in the RC, outside and inside the shielded enclosure under test (EUT). Based on the contrast of the Q-factor estimates, it is possible, in a noninvasive way, to characterize the SE of the EUT, using an energy conservation approach. The dynamic range of measurements is assessed. Experimental results are provided. It validates the principle and confirms the estimated dynamic range.
Published in: IEEE Transactions on Electromagnetic Compatibility ( Volume: 66, Issue: 1, February 2024)
Page(s): 21 - 28
Date of Publication: 26 October 2023

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I. Introduction

The measurement of the shielding effectiveness (SE) of shielded enclosures has a long history in the electromagnetic compatibility field. It is currently based on different methods and standards according to their size and the frequency range of measurement. At high frequencies, i.e., frequencies for which the enclosure size is in the order of magnitude of the wavelength, such measurements are tricky due to intrinsic variations of fields according to positions of antennas(s) or probe(s) both within and outside of the enclosure under test (EUT). Moreover, SE depends on the enclosure contents, specifically in the resonance regime of the EUT. These factors have triggered different works over the past 20 years, aiming at improving measurement procedures along with some changes in the SE definition.

References

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