Emc Engineering

Conductive Enclosure Shielding Effectiveness (Faraday Cage Approximation) calculator

Conductive Enclosure Shielding Effectiveness (Faraday Cage Approximation) engineering calculator. Formula: shielding_effectiveness_db = 20.0 * log(abs(impedance_intrinsic_ohm / impedance_enclosure_ohm)) / log(10.0) + 8.686 * thickness_m * sqrt(2.0 * 3.14159265358979 * frequency_hz * conductivity_s_per_m / permeability_h_per_m) + 20.0 * log(1.0 - exp(-2.0 * 8.686 * thickness_m * sqrt(2.0 * 3.14159265358979 * frequency_hz * conductivity_s_per_m / permeability_h_per_m))) / log(10.0).

Quick Answer

Calculate Conductive Enclosure Shielding Effectiveness (Faraday Cage Approximation)

Calculator

Shielding Effectiveness (dB)
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Result Interpretation

The result shows Shielding Effectiveness in dB, computed directly from the entered inputs using the formula defined for this tool.

Worked Example

Verified calculation

Given:

  • thickness_m = 0.0005
  • frequency_hz = 1000000
  • conductivity_s_per_m = 58000000
  • permeability_h_per_m = 4.0E-7
  • impedance_enclosure_ohm = 0.012
  • impedance_intrinsic_ohm = 377

Expected Result:

  • shielding_effectiveness_db = 131088339.60947

Engineering Interpretation:

A computed shielding_effectiveness_db of 131088339.60947 characterizes the system under the specified input conditions.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.

Formula / Method

shielding_effectiveness_db = 20.0 * log(abs(impedance_intrinsic_ohm / impedance_enclosure_ohm)) / log(10.0) + 8.686 * thickness_m * sqrt(2.0 * 3.14159265358979 * frequency_hz * conductivity_s_per_m / permeability_h_per_m) + 20.0 * log(1.0 - exp(-2.0 * 8.686 * thickness_m * sqrt(2.0 * 3.14159265358979 * frequency_hz * conductivity_s_per_m / permeability_h_per_m))) / log(10.0)

Formula family: formula_emc_shielding_effectiveness_faraday

Variables

SymbolLabelRoleDescription
impedance_intrinsic_ohm Intrinsic Impedance of Medium INPUT Intrinsic Impedance of Medium
impedance_enclosure_ohm Enclosure Surface Impedance INPUT Enclosure Surface Impedance
thickness_m Enclosure Thickness INPUT Enclosure Thickness
frequency_hz Frequency INPUT Frequency
conductivity_s_per_m Material Conductivity INPUT Material Conductivity
permeability_h_per_m Material Permeability INPUT Material Permeability
shielding_effectiveness_db Shielding Effectiveness OUTPUT Shielding Effectiveness

Calculation Steps

  1. Enter the intrinsic impedance of medium in ohm.
  2. Enter the enclosure surface impedance in ohm.
  3. Enter the enclosure thickness in m.
  4. Enter the frequency in Hz.
  5. Enter the material conductivity in S/m.
  6. Enter the material permeability in H/m.
  7. Step 1: Compute shielding effectiveness.
  8. Read the shielding effectiveness (dB) from the results.

Engineering Summary

Calculate Conductive Enclosure Shielding Effectiveness (Faraday Cage Approximation) The calculation uses Direct formula — shielding_effectiveness_db = 20.0 * log(abs(impedance_intrinsic_ohm / impedance_enclosure_ohm)) / log(10.0) + 8.686 * thickness_m * sqrt(2.0 * 3.14159265358979 * frequency_hz * conductivity_s_per_m / permeability_h_per_m) + 20.0 * log(1.0 - exp(-2.0 * 8.686 * thickness_m * sqrt(2.0 * 3.14159265358979 * frequency_hz * conductivity_s_per_m / permeability_h_per_m))) / log(10.0).

Frequently Asked Questions

What does this calculator calculate?

The Conductive Enclosure Shielding Effectiveness (Faraday Cage Approximation) calculator estimates Shielding Effectiveness based on the input parameters you provide

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Intrinsic Impedance of Medium (ohm), Enclosure Surface Impedance (ohm), Enclosure Thickness (m), Frequency (Hz), Material Conductivity (S/m), Material Permeability (H/m). Make sure all inputs use the specified units for consistent results

How does Intrinsic Impedance of Medium affect the results?

The intrinsic impedance of medium directly affects: Shielding Effectiveness. Increasing or decreasing this value will change these output values according to the engineering formula

How should I interpret the calculated results?

The calculator provides the following outputs: shielding effectiveness in dB. Results are computed from the input values using the defined calculation method. Always verify results against project-specific requirements and applicable standards

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas; the calculation method is based on Direct formula shielding_effectiveness_db = 20.0 * log(abs(impedance_intrinsic_ohm / impedance_enclosure_ohm)) / log(10.0) + 8.686 * thickness_m * sqrt(2.0 * 3.14159265358979 * frequency_hz * conductivity_s_per_m / permeability_h_per_m) + 20.0 * log(1.0 exp(-2.0 * 8.686 * thickness_m * sqrt(2.0 * 3.14159265358979 * frequency_hz * conductivity_s_per_m / permeability_h_per_m))) / log(10.0). Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

When is this calculation useful?

The Conductive Enclosure Shielding Effectiveness (Faraday Cage Approximation) calculator is useful during preliminary design, feasibility studies, and quick engineering checks in emc.toolfusion.net projects. It helps engineers and designers estimate key parameters before proceeding with detailed analysis

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