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Shielding performance considerations for shielded rooms

Author:admin   AddTime:2021-04-15

l S=E0/E1 or S=H0/H1
l S-shielding effectiveness
l E0 (H0)-the electric field strength (magnetic field strength) at a certain point in space when there is no shield
l E1 (H1)-the electric field strength (magnetic field strength) of the shielded space at that point when there is a shield
In the calculation and testing of shielding effectiveness, there are often huge differences in field strength values (up to thousands of times of signals). In order to facilitate calculation and expression, the logarithmic unit is usually measured by one decibel (dB). defined as
l SE=20lg E0/E1
l SH=20lg H0/H1

Because there are usually people and equipment working in the shielded room, while the shielding room is airtight on six sides, there must be a shielded door for personnel and equipment to enter and exit, good ventilation, indoor power supply, and signal entry and exit. Interior decoration to ensure that the shielded room can work normally.



The following factors affect the shielding effectiveness of shielded rooms
l Materials used in shielded room
l Seam treatment of shielding material
l Screen door
l Ventilation window
l Shielding window
l Filter processing of power cord
l Shielding of signal lines

Shielding shell: the contents of the shielding shell are mainly six-sided shielding materials, connections between materials, and supporting keels.
Shielding material: When the shielding material is metal plate, its shielding effect:
At=8.68t/σ+20lg{(Z0+Z3) 2/4Z0ZS}dB

Absorbing Material:https://www.goodsmaterial.com/

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