The shielding principle and types of electromagnetic shielding rooms

The several components of the electromagnetic shielding room are air conditioning, fire alarm, grounding, power shockproof, and air intake and exhaust systems. The shielding effect of an electromagnetic shielding room is very good, so what is the shielding principle of an electromagnetic shielding room? How many shielding rooms are there currently? Let me introduce electromagnetic shielding to you one by one.
Electromagnetic shielding room
The commonly used electromagnetic shielding chamber refers to the latter type, which shields both electric and magnetic fields simultaneously.
According to the principle of shielding effect, the contribution of shielding materials to shielding effectiveness is divided into three parts:
(1) Reflection loss caused by impedance mismatch on the surface of the shielding body;
(2) When electromagnetic waves are transmitted inside the shielding material, the absorption of electromagnetic energy causes transmission loss or absorption loss;
(3) The multiple reflection loss caused by multiple reflections of electromagnetic waves between the inner walls of shielding materials.
From this, three basic factors that affect the shielding effectiveness of materials can be obtained, namely the conductivity, magnetic permeability, and material thickness of the material. This is also a problem and breakthrough that must be paid attention to in the research of shielding materials themselves. Of course, for the electromagnetic shielding structure, the function of the electromagnetic shielding chamber is also related to the structure, shape, airtightness, etc. For specific problems, it is also necessary to consider the frequency of the electromagnetic wave being shielded, the properties of the field source, etc