1. Parameters characterizing the effectiveness of electromagnetic shielding
The effectiveness of electromagnetic shielding is assessed by measurable quantities, based on two physical concepts
the attenuation of a shield, expressed in dB ;
the homogeneous transfer impedance with a linear parameter expressed in Ω/m.
As the following examples show, the choice of definition depends on the type and area of application of the shielding.
Consider a metal enclosure, such as a Faraday cage, exposed to an electromagnetic field.
Field sensors, located where the enclosure will be installed, measure the electrical and magnetic components, noted respectively
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Parameters characterizing the effectiveness of electromagnetic shielding
Attenuation of electromagnetic waves by conductive planes
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