EMI Protection: Everything You Need To Know in 2023


In today’s world, we rely on Electromagnetic Interference (EMI) Technology; however, it bears some consequences during use, and one of its concerns is the disturbances it creates. Although humankind cannot feel the interference, it significantly impacts electronic devices.

As an illustration, if such signals exist in the naked eye and are tangible, they are undeniably harmful to us and may lead us to trips and even worst-case accidents. Hence, it is crucial to address such disturbances to safeguard our electronic devices from failure.

In line with this, if that particular device experiences extreme interference, it may lead to reduced performance stability and reliability, resulting in unaccepted functionality. As a result, almost all manufacturers integrate systems into the board with various methodologies to reduce such happenings and even eliminate them, if possible, effectively.

Consequently, we’d like to educate our readers about the fundamental knowledge they must have about EMI and EMI Protection. In order to fulfill this objective, we will tackle its definition, importance, classifications, origin, and materials. Therefore, reading the entire post until the end will be beneficial to comprehend its concept completely.

Introduction to EMI Protection

Introduction to EMI Protection

What is EMI Protection?

We’ll briefly discuss what an EMI, or Electromagnetic Interference, is before moving on to the concept of EMI Defense. In essence, the EMI occurs when harmful electromagnetic radiation is disseminated to an electronic device without its authorization.

Another term for such instances is Radio Frequency Interference wherein will be discussed further in the RFI Shielding article. In fact, the EMI appears during the disruption of another signal source; it creates an unpleasant signal wave. As an illustration, if one plays a song through an instrument, then it misses one note, and it can create unwanted noise.

Similarly, it is the way EMI acts. In line with this, the experts created an approach to accommodate such situations through EMI Protection or EMI Shielding. As its term implies, it protects against the disrupted signals generated by exterior Electromagnetic Signals and prevents the surrounding components from intervention. Hence, it is essential to incorporate EMI Protection to ward off unnecessary signals.

Importance of EMI Shielding

As mentioned, Electromagnetic Interference (EMI) can disrupt signals in electronic devices, which can be critical in some industrial applications, such as medical, military, and aerospace. All of these industries are prone to damages against such interference if not addressed appropriately; hence, the need to incorporate protection.

Segregating a device’s energy from its immediate surroundings and preventing damage coming from external radiation are two of an EMI Shielding’s essential responsibilities. In that way, the electronic device will be free from reliability and performance concerns. Although there are various ways to protect the device against EMI since it can be created naturally and man-made, it has one ultimate goal, to safeguard the device above anything else to prevent it from failure.

In order to fully understand the harmfulness EMI can bring to the electronic device, we’ll name a few of its effects.

  • It brings corrupted or fragmented signals that communication devices obtain.
  • It can potentially cause electrical surges, voltage deviation, and unanticipated power failures.
  • Even complete destruction to or breakdown of an electrical circuit.
  • It can lead to the electronic systems’ reduced durability and functionality.
  • It may lead to burns and electrocution.
  • Ultimately, it could raise possible sources of combustion.

Importance of EMI Shielding

Significance of EMI Protection

Different Types of EMI

EMI Types vary depending on the category we wish to touch; however, in this section, we will focus on interference classifications with continuous and pulse.

  • Continuous Interference – As its name suggests, it continuously produces undesirable impulses. It is typically correlated with decreased energy and low amplitude, and it may encompass radio frequencies, leakage of the electromagnetic field from mechanical systems, electricity transmission lines, and so on.
  • Pulse Interference – As its term suggests, it only occurs in a short period that may vary depending on its application. Basically, significant energy spikes that can be repeated or sporadic events are usually what defines it. Fundamentally, recurrent behavior is typically manufactured, which makes its intensity and longevity predetermined.On the other hand, unpredictable mutations, including lightning, power outages, insulation failure, and so forth, can be both man-made and spontaneous.

EMI is also divided into Narrowband Disturbance and Broadband Disturbance, depending on the Wavelength Frequency.

  • Narrowband – Its frequency is lower or equivalent to that of the transmitter.
  • Broadband – On the contrary, its frequency length and bandwidth are longer than the narrowband.

Origin of EMI

It was countlessly mentioned that EMI could be generated either man-made or naturally.

Solar flares from the sun and lightning strikes are two examples of naturally occurring events that can induce EMI. Moreover, obsolete gear with corroded shielding or without any EMI Shielding mechanisms at all may experience EMI problems. Additionally, massive apparatus that emits a strong signal or simply has a high loudness can also impede signals, like elevators, HVAC, and automotive vehicle traffic signals can create such disturbances. Particularly for high-precision study applications, machinery and electronic components may emit misdirected magnetic or electric fluxes.

Overall, no particular device can avoid the EMI, regardless of the purpose of their application. Nevertheless, EMI Shielding can help greatly diminish the harm that electromagnetic interference does to the equipment.

Origin of EMI

EMI History

EMI Protection Materials

In essence, three (3) principal metal types are used to produce EMI Shielding; however, in some cases, they can be combined into one to generate the best possible protection.

Pre-Tin Plated Steel

Pre-Tin Plated Steel is a significantly less expensive option for EMI protection, like Carbon Steel, although it only performs at its best when used at lower frequencies, from kHz to a few GHz. Furthermore, it can prevent rust and corrosion from occurring in the steel.

Copper Alloy 770 or Nickel Silver

Since the Copper Alloy 770 has an exceptional characteristic that can resist corrosion, consumers frequently prefer it. Further, it is composed of a combination of copper, nickel, and zinc. As for usage, they are undeniably ideal for mid-range kHz to specific values of GHz, which are suitable for MRI technology.


Due to its noteworthy conductance, Copper is essential for EMI shielding. One of the reasons is because of its capability to lessen the presence of magnetic and electrical waves. Despite being made of Copper, they are not the same as Copper Alloy 770.


In contrast to copper, which has excellent conductivity, Aluminum has a greater value for conductivity at 60%, which is way greater than copper; thus, making them another great option for EMI Shielding. However, despite its excellence, it has its downsides; it can quickly corrode due to its remarkable oxidation properties.


When two substances are separated by a gasket, a closure is created. EMI Shielding Gaskets are employed to buffer devices from disturbances and are analogous to plugs used for electrical contacts.

Film and Foil

It is thought that a foil unites microparticles of conducting material, such as copper or silver, with a sealer in order to wrap around a device and shelter it from electromagnetic radiation. These strips are a simple and practical way to shelter equipment because they are malleable, form-fitting, and straightforward to use.


In a nutshell, carbon foam, a compact material that can withstand high temperatures and has tunable thermal and electromagnetic qualities, is the variety of mattresses utilized for EMI Shielding.


In general, Silicon is electrically non-conductive. On the contrary, it is possible to make them one by adding the presence of metal. In that way, it can already be used to make products that act as EMI Shields. They are suited for frequencies between 20 Hz and 10,000 Hz as well, owing to the nickel graphite in them.


In summary, it has been mentioned that Electromagnetic Interference (EMI) can significantly affect the performance, reliability, and functionality of a device if not prevented; however, due to the emergence of EMI Protection, this has no longer a concern for almost all consumers. Therefore, it is crucial to integrate protection to protect the gadget from EMI impacts.

As an expert in the industry with over a decade of experience, PCBTok has built enough reputation in the industry. Therefore, you can entrust your devices with us; we do not settle for mediocrity. We’ll always ensure that your device will last longer and will never experience any issues in the long run. We constantly prioritize the needs of our consumers by providing them with quality products and services for their benefit.

Why keep waiting? Take advantage of our EMI Protection today to qualify for our daily exclusive deals. We promise that your time with us will be valuable because we provide many perks and freebies. Please message us immediately!

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