This calculator is based on theoretical models for reference only. Actual shielding effectiveness is affected by grounding design, contact reliability, frequency accuracy, and other factors, with possible ±5-10dB deviation. Design verification should include actual testing.
Click Calculate after entering parameters to view results
RL = 20·log₁₀(√σωμ / 2) [dB]
Where: σ=conductivity, ω=angular frequency, μ=permeability. Higher conductivity and frequency lead to higher reflection loss.
AL = 20·log₁₀(e^(-t·√(πfσμ))) [dB]
Where: t=thickness, f=frequency. Thicker materials and higher frequencies produce higher absorption loss.
AC = 20·log₁₀(λ/(20·a)) [dB]
Where: λ=wavelength, a=aperture size. Following the λ/10 rule, apertures reduce shielding effectiveness.
SE = RL + AL + MRC – AC [dB]
MRC=Multiple Reflection Correction. Simplified model assumes MRC=0, significant at high frequencies.
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