Shielding Effectiveness of a Thick Multilayered Panel in a Reverberating Environment

This paper presents and discusses different approaches for the measurements of the shielding effectiveness of thick multilayered panels, based on the use of nested reverberation chambers. In particular, it is considered the case of thick multilayered panels, characterized by one highly reflecting face, like a protected composite laminate or a protected glazing window. The paper proposes a novel test procedure, which allows one to estimate from the measurement of a finite dimension panel, the shielding performance of an infinite material sheet against a reverberating field. The method is validated by comparison with the results of analytical simulations and provides accurate results in a wide frequency range, above the lowest-usable frequency of the outer chamber.