Electromagnetic shielding is the use of shielding materials to block or attenuate the transmission of electromagnetic energy between the shielded area and the outside world. The principle of electromagnetic shielding is to use the shielding body to reflect, absorb and guide the electromagnetic energy flow, which is closely related to the charges, currents and polarizations induced on the surface of the shielding structure and inside the shielding body.
According to its principle, shielding is divided into electric field shielding (static shielding and alternating electric field shielding), magnetic field shielding (low frequency magnetic field and high frequency magnetic field shielding) and electromagnetic field shielding (electromagnetic wave shielding). The so-called electromagnetic shielding refers to the latter, that is, shielding the electric field and the magnetic field at the same time.
According to its principle, shielding is divided into electric field shielding (static shielding and alternating electric field shielding), magnetic field shielding (low frequency magnetic field and high frequency magnetic field shielding) and electromagnetic field shielding (electromagnetic wave shielding). The so-called electromagnetic shielding refers to the latter, that is, shielding the electric field and the magnetic field at the same time.