What Is EMI Shielding ?

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Update time : 2021-12-13 17:43:49
What’s EMI ?

EMI: Electromagnetic wave will interact with electronic components to produce interference, which is called EMI (electronic interference). For example, the common "snowflake" on TV screen indicates that the received signal is disturbed.

When electronic equipment works, Neither want to be disturbed by external electromagnetic waves, or radiate electromagnetic waves to interfere with external equipment, or radiation hazards to human body. This requires electromagnetic shielding to block the propagation path of electromagnetic wave. The attenuation of electromagnetic shielding is mainly based on the reflection and absorption principle of electromagnetic wave.

Types of EMI: Conducted and radiated interference.
Electromagnetic conducted interference refers to that the interference source couples (interferes) the signals on its own electrical network to another electrical network through conductive media (such as wires). The most common example is that the power supply in our computer will affect the home power network. When the computer is turned on, the lights in the home may dim. This is more obvious on computers using inferior power supplies of miscellaneous brands.
Electromagnetic radiation interference is often referred to as electromagnetic radiation. It refers to that the interference source couples (interferes) the signal on its own electrical network to another electrical network through space. Human life activities include a series of bioelectrical activities. These bioelectrics are very sensitive to environmental electromagnetic waves. Therefore, excessive electromagnetic radiation can affect and damage the human body. this part of electromagnetic radiation interference is which people often worry about "radiation".

Electromagnetic shielding material:
Three mainly kinds of Electromagnetic shielding materials :
Metal: directly select metal materials, such as beryllium copper, stainless steel, etc.

Filling: add a certain proportion of conductive filler to the non-conductive substrate to make the material conductive. Silica gel, plastic and other materials can be used. The conductive filler can be metal sheet, metal powder, metal fiber or metallized fiber.

Surface coating and conductive coating: electroplating the substrate, such as conductive cloth, etc
The illustration of EMI shielding mechanism | Download Scientific Diagram

Why EMI-RFI Shielding is important of electrical enclosures ?
Using RFI/EMI shielding to protect electrical devices ensures no frequency disturbances from one device to another. For example, when we watch TV, when someone nearby uses household appliances such as hair dryer or razor, there will be snowflake noise on the TV screen
EMI Challenge: Electromagnetic Noise | EMC Testing Facility | Contact Us  Today

The airport is the most needs RFI/EMI shielding. The constant communication transpiring among different airplanes and the tower must never be interrupted by any other radio frequency. If there is no EMI/RFI shielding, disasters may happen. This is the reason why RFI/EMI shielding is very crucial.

RFI / EMI shielding allows electronic devices to be undisturbed. electrical enclosures with EMI-RFI shielded can reliably house your sensitive electronics.

MANIBOX’s enclosure can be customized with EMI-RFI shielding to protect your electronic devices from RFI interference and other types of high-frequency electromagnetic interference.

We’re always glad to assist our customers with questions about RFI/EMI shielding. If you want to know more about RFI/EMI shielding, you can email us.

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