Faraday cages and shielded rooms

Faraday cages, also known as electromagnetic shielding enclosures, play an extremely important role in the safety of strategic data and information. They protect against the effects of external electromagnetic fields. A device with a special shield made from conductive material blocks electromagnetic waves both from outside and from inside. Electromagnetic waves and currents are essentially trapped and circulate around the special shield.

A Faraday cage is a closed space surrounded by an electrical conductor, which distributes electric charges over its surface in such a way that the electromagnetic field inside the cage is significantly weakened or even zero. They are used to protect against electromagnetic interference and also for conducting scientific experiments.

The Faraday cage acts as an electrostatic shield made of metal, whose main function is to protect objects from the influence of external electric fields. Importantly, the shape of the cage can vary – from a metal can to a box or a large chamber – as long as the material used is a perfect conductor, which means a uniform electric potential across its surface. When there is an external electric charge, negative charges in the metal move to neutralize this charge. As a result, regardless of the strength of the external charge, the magnetic field does not penetrate inside.

The mechanism of the Faraday cage's operation is based on a simple principle – when an external electric charge appears on the surface of the metal, charges in the metal rearrange themselves. An electric field of opposite direction to the external electromagnetic field is created on the surface of the cage. This process continues until equilibrium is reached between the electric field on the surface of the cage and the field generated by the conductor.

As DACPOL, we are a supplier of the aforementioned cages. Our unique solution is the use of modular construction. This unique approach makes our EMC cages flexible, easy to adjust, and easy to modify. We also create unique doors for EMC cages in the industry, providing effective protection against radiation up to 40 GHz, achieving shielding at 100 dB level. The effectiveness of our solutions is confirmed by conducted tests and implementations.