Electromagnetic shielding (Radio and cage)

1. Electromagnetic radiation consists of coupled electric and magnetic fields.
2. Electromagnetic shielding is the reduction of the electromagnetic field in a space by blocking the field with barriers made of conductive (Faraday cage) or magnetic materials.
3. Shielding that blocks radio frequency electromagnetic radiation is known as RF shielding.
4. The amount of reduction depends upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic field.
5. Materials used: sheet metal, metal screen etc.
6. Due to the electrical resistance of the conductor, the excited field does not completely cancel the incident field.
7. Most conductors exhibit a ferromagnetic response to low-frequency magnetic fields, so that such fields are not fully attenuated by the conductor.
8. Applications: co-axial cable, doors of microwave oven.

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