How Does A Shielded Computer Room Block Electromagnetic Signals?

Our electronic devices all have signals, and in some enclosed spaces, the signal may deteriorate. For example, when we are in an elevator room, we may find that there is even no signal. In some research institutions, there are specialized facilities to shield electromagnetic signals and prevent information leakage,
Computer shielding engineering is a comprehensive project that involves anti-interference technology in shielded rooms, air conditioning technology, power supply and distribution technology, automatic detection and control technology, comprehensive wiring technology, as well as various specialties such as purification, fire protection, architecture, and decoration. The computer room shielding system mainly includes the basic environment shielding part of the computer room, and the main content is as follows:
The overall shielding environment of the computer room: including the ground, walls, suspended ceilings, ventilation openings, entrances and exits, windows, etc., as a C-level computer room shielding system.
Machine room grounding: including grounding of shielding body, grounding of lightning protection belt, and grounding of system operation.
Machine room shielding equipment cabinet: Reserve two machine room shielding equipment cabinets for future equipment use.
Electromagnetic shielding chamber structure during steel plate welding: The shielding chamber of the welded structure is composed of different specifications of steel plates (with a thickness of 3mm) welded together. Designed and manufactured according to the different bearing capacity of different parts of the shielding shell, rectangular steel keels with different cross-sectional areas are used as the supporting gantry frame of the shielding shell. Its main characteristics are stiffness, seismic resistance, stability, and reliability, which are the shielding rooms of other structures, and the shielding efficiency is much higher.
Electromagnetic shielding refers to the shielding of electromagnetic waves, while classical shielding refers to the shielding of electrostatic fields. Static shielding requires that the shielding body must be grounded. The electromagnetic shielding effectiveness of the shielding body is not affected by the grounding of the shielding body, but by the conductivity and continuity of the shielding body. The factors that disrupt the conductivity continuity of the shielding body include the seams, openings, etc. of different parts on the shielding body. Therefore, electromagnetic shielding requires stricter conductivity of the shielding body than electrostatic shielding.
Based on the numerical analysis of the relative conductivity, relative magnetic permeability, absorption calculation, reflection loss, and other coefficients of different materials, the shielding body of this shielding room is selected as a metal material with iron as the collective, and the thickness of the steel plate is 2mm. The ground adopts 3mm thick steel plate of the same material as the shielding layer.
Considering the shielding effectiveness of the shielding material while also considering the overall mechanical performance of the electromagnetic shielding room, the design requirements include: steel plate unevenness ≤ 4mm/M2, shielding perpendicularity ≤ 10mm, and shielding seismic resistance ≥ Level 8.
According to the different bearing capacity of different parts of the shielding shell, rectangular steel keels with different cross-sectional areas are designed and manufactured as reinforcement support for the shielding body. The keels are welded with 30 * 40mm rectangular pipes attached to the inner wall of the shielding body steel plate.
The raw material of the shielding body (steel plate) is processed and made into unit modules, and the on-site installation adopts the fusion welding process for continuous welding (Co2 carbon dioxide protection welding). Its characteristics include narrow welding hot zone range, small deformation, tight welding seams, and no slag on the surface The shielding effectiveness at the joints of the shielding layer module board remains consistent, and colleagues can also improve the electrochemical corrosion resistance of the welds.