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Electromagnetic Shielding Effectiveness Calculator

Select Equations:

Material Properties

Select Pre-defined Material (Optional)
Relative Permittivity (εr = εr' + j εr"):
εr' = ; εr" =
Relative Permeability (μr = μr' + r"):
μr' = ; μr" =
σ = S/m
t =

Select Values to be Plotted:

Illustration of plane waves incident on, reflected by, and transmitted through an infinite sheet of material with thickness, t.

Current axes limits:

For More Information on Plane Wave Shielding Effectiveness Calculations

  1. A. McDowell and T. Hubing, “Analysis and comparison of plane wave shielding effectiveness decompositions,”
    IEEE Trans. on Electromagnetic Compatibility, vol. 56, no. 6, Dec. 2014, pp. 1711-1714.
  2. A. McDowell and T. Hubing, “Decomposition of Shielding Effectiveness into Absorption and Reflection Components,”
    Clemson Vehicular Electronics Laboratory Technical Report: CVEL-14-058, Apr. 10, 2014.

Notes on accuracy

  1. For over thousands of dB of shielding effectiveness, some of the calculations may not work due to numerical overflow.
  2. These calculations assume constituitive parameters independent of frequency which is not always a reasonable assumption.
  3. Material constituitive parameters of pre-defined materials are approximate and do not account for the sometimes very major frequency dependence of these parameters (especially the relative permeability of ferromagnetic materials)

Original version of this calculator was created by Andrew J. McDowell, 2014.

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