RFI Shielding: Everything You Need To Know in 2023


In understanding the RFI Shielding, it would be beneficial to have a little background about its acronym definition. RFI, which is short for Radio Frequency Interference, is a phrase that is frequently used in conjunction with the terminology “Electromagnetic Interference” (EMI).

Although they are similar in a way since either of them can pose a problem to the device due to their emitted interference and disturbances, however, even if that’s the case, experts in the field decided to develop a way to prevent the destruction of the device and machinery.

Like EMI, the RFI creates invisible signals in the atmosphere that may disrupt the performance of the components in a device if such pieces are left unprotected. As a result, the device will perform poorly; in the worst-case scenario, it may fail. Nevertheless, such concerns are fully addressed due to the help of RFI Shielding and EMI Shielding.

In line with this, we’d like to assist our readers in thoroughly understanding the principle of RFI Shielding by providing its definition, distinction against EMI Shielding, purposes, ways of protecting the device, industries it caters to, and ways to determine if one needs RFI Protection. Hence, it’ll be beneficial to one’s part if one finish reading the article throughout.

Introduction to RFI Shielding

Introduction to RFI Shielding

What is RFI Shielding?

As mentioned, Radio Frequency Interference (RFI) releases disturbances toward the neighboring devices that may damage them. If these interferences are left untreated and the surrounding component is left unprotected, it may fail.

All experts in the field gathered their thoughts in generating a probable solution for this concern; they’ve concluded that shielding would be a great way to solve such issues. Thus, the emergence of RFI Shielding. Its principal function is to lessen the risk of the created external electromagnetic signal damaging the equipment, which is essentially the same as EMI Shielding.

To completely accommodate the concern, Engineers and Designers have conducted extensive research about various materials that can attenuate the signal strength received. It should be able to safely guard the sensitive areas of the device against this harmful signal by creating seals or gaskets. Overall, the concept of RFI Shielding can be straightforward; there’s no need to complicate things to understand them better.

Difference Between RFI and EMI

In this section, we will clear the confusion between Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI) since many people often interchange them. Although they are almost similar, they have a little distinction from each other. To fully understand them, we’ll use an analogy of roses and flowers.

All roses are considered to belong to the family of flowers; however, not every flower is a rose. In the same way, RFI can be an EMI but not the other way around. It is because they have varying signals of interference. In general, RFI only corresponds to frequencies that occur within the radio frequency range of a particular kHz to 30 MHz, while EMI generally refers to any wavelength that may interfere with electronic transmission.

RFI and EMI can both negatively impact electronics in a variety of ways, but they do so in very diverse ways. Even though that’s the case, EMI Shielding and RFI Shielding utilize the same amount of conductive material and paints to safeguard the neighboring components since they will help produce more robust solutions.

Various Purposes of RFI Shielding

Although the responsibility of an RFI Shielding is relatively straightforward, it has various usages depending on the desired purpose of the client. We have gathered some of the standard integration of RFI Shielding.

  • Containment – It is a protection that primarily aims to prevent an interference’s breakout.
  • Exclusion – As its term indicates, its fundamental duty is to safeguard the device from the invasion of interference or disturbance.
  • Grounding and Contacting – It can be used for constructions with insufficient foundations.
  • Absorptions – As its name implies, it consumes unwanted signals via ferrites and material containing ferrite.

How Does RFI Shielding Safeguard Devices?

Essentially, the process of RFI Shielding in guarding devices is pretty straightforward. Once it detects Electromagnetic Signals, it immediately reduces its speed before reaching the sensitive components in an electronic device, which may lead to cracking and eventually malfunctioning. Its functionality is highly essential in aircraft and aerospace safety equipment. If left unmitigated, it can affect the device’s functionality.

To see the bigger picture, let’s take medical monitor equipment as an example of machinery. Since they are used to check and monitor a patient, they are crucial devices in determining a patient’s health status. Hence, if disrupted by a signal, it may highly affect the dictation of the patient’s condition. Apart from that, it may even erase all of the patient’s records, which is a terrible situation.

Therefore, it is necessary to carefully build protection to prevent concerns from happening due to interference and disruptions caused by Radio Frequency and Electromagnetics.

How Does RFI Shielding Safeguard Devices?

Principle of RFI Shielding

Several Industries that Necessitate RFI Shielding

Almost every industry existing today needs the assistance of an RFI Shielding that are prone to Electromagnetic Interference and Radio Frequency Interference to produce way efficient performance. Some of them include the following:

Every industry mentioned has a terrible effect if engaged in Electromagnetic Signal Interference that may malfunction and potentially damage the device. Therefore, in such circumstances, using an RFI and EMI Shielding would be advantageous.

Who Needs RFI Shielding?

It is undeniably true that almost every industry and consumer wants their devices to last long by not experiencing any malfunctioning or failures. However, not every sector requires the usage of RFI and EMI Protection. On the contrary, some industries highly necessitate the incorporation of RFI Shielding in their devices.

Similar to the previously stated example, in the medical field, medical equipment may break down due to interference if it is not appropriately shielded, which could jeopardize patients’ health. In the same scenario, these signal waves can significantly interfere with communications for the first responders; to affected victims, this might have disastrous repercussions. Similar to the way the aircraft sector frequently needs to employ shelters with RFI shielding materials to safeguard vital satellite communications.

Every industry needs the assistance of EMI and RFI Shielding, regardless of the importance and necessity. It is way better to prevent equipment failure and keep the operations of such devices at their optimum performance than let them experience disturbance and possibly spend again for repair.

Who Needs RFI Shielding?

Industries that Demand RFI Shielding


In conclusion, Electromagnetic Interference (EMI) and Radio Frequency Interference (RFI) can both be detrimental to practically all digital equipment. However, due to the development of RFI Shielding, it no longer poses any risk to the devices and machinery. Further, it has been cleared in this article that RFI and EMI have quite a dissimilarity.

If you’re planning to incorporate RFI and EMI Protection into your devices, reaching out to a manufacturer with extensive industry experience would be beneficial. In that way, you can ensure that the quality and materials used in constructing the gaskets or seals are remarkable. All of these are attainable in PCBTok; hence, feel free to message us for any inquiries you may have; we are available to attend to your concerns day and night.

Since we’ve been in this industry for more than twelve (12) years, we can assure you that your time with us will be highly worthwhile. Why do you persist in waiting? Send us your guidelines, and we’ll make sure there are no loose ends in anything. Call us immediately!

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