How to Use the Calculator
- Enter the frequency of the electromagnetic field in MHz.
- Select the shielding material from the dropdown list.
- Input the thickness of the shielding material in millimeters (mm).
- Enter the conductivity of the material in MS/m (MegaSiemens per meter).
- Click the "Calculate" button to compute the shielding effectiveness.
Understanding the Results
The calculator provides three key metrics:
- Shielding Effectiveness (dB): Measures how well the material reduces electromagnetic field strength, expressed in decibels (dB).
- Reflection Coefficient: Indicates the fraction of electromagnetic energy reflected by the shielding material.
- Absorption Coefficient (dB/m): Shows how much energy is absorbed by the material per unit thickness.
Principles of Shielding
Shielding effectiveness depends on:
- Frequency: Higher frequencies generally require more effective shielding.
- Material Properties: Materials with higher conductivity and permeability provide better shielding.
- Thickness: Increasing the thickness of the shielding material improves shielding effectiveness.
Applications
This calculator is useful for:
- Designing electromagnetic compatibility (EMC) systems
- Protecting sensitive electronic equipment from interference
- Optimizing shield design for specific frequency ranges