What is EMI shielding and what enclosure should you use?

What is EMI shielding and what enclosure should you use?

August 25, 2022by yongubox0

What is EMI shielding and what enclosure should you use?

Given the increasing number of electronic devices that are being developed and utilized daily, a new problem has emerged, namely the interference caused by the waves and signals they emit. It doesn’t matter what kind of electronic gadget you have or how you use it; EMI and RFI are genuine and significant threats to all electronic devices. A lack of EMI and RFI shielding can cause equipment to malfunction or break down completely. Although electrical engineers have more affordable choices, EMI shielding is one of the most effective and cost-effective methods accessible.



EMI and RFI are electrical equipment problems induced by electromagnetic emissions from an external source.

Even though the terms “EMI” and “RFI” are sometimes used interchangeably, there is a crucial distinction between the two: whereas EMI refers to all types of electrical noise, RFI focuses on a subset of this noise, i.e., radio frequency spectrum.

An EMI or RFI shield reduces the amount of electromagnetic radiation in a particular area or device to avoid interfering with other electronic equipment. To prevent electromagnetic waves from entering or exiting a device, EMI shields, which are also known as shielding enclosures, make use of conductive or magnetic materials.



EMI and RFI can originate from both natural and man-made influences. A product’s electrical components can be disrupted to varying degrees by virtually any electrical source; however, this varies widely.

Natural Sources

Thunder, coronal mass ejections and radiation, dust and snow storms, and atmospheric electrical storms are all examples of these phenomena.

Man-Made Sources

These include electric motors and generators, power supplies, cellular networks, transmitters, transformers, electric blankets, electric insect killers, baby monitors, microwaves, heaters, lamps, and gadgets that utilize Wi-Fi and Bluetooth technology.



Electronic shielding is now a critical concern for every circuit designer or engineer. Understanding the nature of electromagnetic interference makes it clear that it can have a negative impact on its immediate environment. As a result, electromagnetic interference (EMI) can have a direct influence on electronics, as well as have a long-distance effect, as in the case of electromagnetic radiation (EMR).

The proliferation of electronic devices for communication and data processing has significantly increased electromagnetic wave pollution. All of this holds, even if natural phenomena like solar flares or lightning strikes aren’t the only causes of power outages.



When electrical equipment is shielded from RFI and EMI, there will be no frequency interference from one device to the next. When it comes to telecommunications firms, they need to ensure that no other radio frequencies interfere with or cross paths with the frequency they utilize. Using an outdated two-way radio while watching television is a good example. The two-way radio’s frequency will inadvertently disrupt the television in a particular manner. The two-way radio communication may be aired on television.

The airport is another location that might benefit from RFI/EMI shielding. No other radio frequency must interfere with the steady flow of information between planes and the tower. Without proper EMI & RFI protection, calamities might occur.

It is why RFI & EMI shielding is so crucial for different sectors, and everyone has a different explanation but the same reasons.



The likelihood of signal and data deterioration, crossover, and equipment failure is increased when EMI and RFI are present. As a result, different systems can be delayed or jammed, and personnel lives are exposed to danger.

Experience Matters 

The critical components must be well safeguarded to get the most out of electronic equipment. The reliability, durability, and performance requirements for devices used in mission-critical applications are higher than those for typical consumer electronics, although customer-based electronics have a great significance. Choosing the right design and manufacturing partner is the first step in guaranteeing adequate connection shielding.



Filtration at the connection interface is the best barrier against EMI/RFI, followed by shielding materials. Professional interconnecting solution engineers and designers usually recommend multi-shielding solutions for more complicated requirements and unique or susceptible applications.

Sprays, paints, or brush-on coatings made with acrylic are some examples of shielding materials that may apply to electronic housings. These shields are made out of exceptionally pure metals like copper, silver, and nickel, and their purpose is to assist lessen or eliminating the impacts of EMI and RFI. There are a few distinct methods that crucial can be shielded using various types of materials. Aluminum and steel enclosures are two of the most popular RFI and EMI shielding solutions since they can be used indoors and outdoors and have better thermal tolerance.



EMI shields and enclosures aren’t all created equal. Because of this, it’s essential to figure out which method works best for you. The efficacy of an EMI shield or enclosure may be evaluated using a specified set of tests and measuring criteria. For this evaluation, the attenuation level is one of the primary indications. Complexity arises when attenuation is determined. Different shielding technologies are employed for various purposes. Tests for shielding strength that are most commonly used include:


Open Field Test

This test, which is intended for finished electrical items, is often performed in an open location devoid of any metallic equipment of note. Antennae installed at various distances from the device are used to measure the gadget’s radiated strength of the magnetic field and conductive emissions.


Coaxial Transmission Line Test

A planar material’s shielding efficacy is evaluated using this method, which is a type of comparison methodology. The voltage it receives at various frequencies is monitored using a benchmark instrument. The load is then used to collect voltage measurements. To determine how effective the shielding is, compare the readings from the reference and load devices.


Shielded Box Test

This approach works best for frequencies below 500 MHz. A sealed box with an opening is used in this method. A shielding device pierces the box’s entrance. Electromagnetic signals from both inside and outside the box may be recorded using this technique. The ratio of the two signals determines shielding efficacy.


Shielded Room Test

This technique makes use of two protected rooms connected by a wall. Sensors and testing equipment are housed in separate rooms. External signals can be minimized by using shielding leads. This method is perfect for determining how vulnerable a gadget is.



Shielding against dependable EMI and RFI has become more critical than ever in recent years due to the proliferation of electronic devices. It is essential to give some thought to purchasing an EMI-RFI shielded enclosure capable of storing your sensitive electronics in a dependable manner to safeguard your equipment from the possibility of interference.

Our metal electronic enclosures guard your equipment against RF interference and other forms of high-frequency electromagnetic interference. The YONGUBOX suite of design and analysis tools may help you create a practical RF interference shielding approach (EMI).

YOUNGUBOX is able to provide customers with an extensive selection of aluminum enclosures, including both conventional designs suitable for the factory floor and cost-effective boxes. Aluminum is a material that is frequently used for portable enclosures due to the fact that it is both lightweight and extremely durable.

YONGU sheet metal boxes are suited for EMI protection as a result of the aforementioned elements in addition to their IP65 rating and other protective services.

YONGUBOX has two kinds of sheet metal enclosure boxes that are entirely customizable in every dimension.


For further information and customized product of your requirements, follow our Facebook for more details: YONGUBOX.

You can also contact us at +86 13326782625 or write us at salesglobal@yonggu-enclosure.com.

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