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Shielding Effectiveness Testing

Shielding Effectiveness, Reflection & Scattering Testing

RTL performs shielding effectiveness, penetration depth, reflection and scattering testing on various materials. We have tested numerous materials used for cellular phone tower aesthetics. We have designed automated fixtures for various test materials from DC to 220 GHz.

RTL conducts Shielding Effectiveness testing to the following standards:

  • MIL-STD-285
  • NSA 65-6
  • IEEE 299

Shielding Effectiveness testing - shielded test

Shielding Effectiveness

When a given electric field strength impinges on a shield barrier at a particular frequency, the wave current is induced into the barrier. This current is reduced by the barrier's skin effect as the wave penetrates the barrier. The ratio of the wave that penetrates the barrier and the incident wave on the barrier is the Shielding Effectiveness of the barrier.

Penetration

Penetration depth is equal to the reciprocal of Shielding Effectiveness.

Reflection

Reflection occurs when part of an electromagnetic incident wave that impinges on a material surface returns to its original source。

Scattering

Scattering occurs when a transmitted wave encounters one or more discrete objects, a rough boundary between two mediums, or continuous irregularities in the complex permittivity of the encountered medium.

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