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RF Shielding

A reliable source for RF Shielding information and leading RF Shielding Companies.

Radiofrequency shielding (RF) prevents radiofrequency electromagnetic impulses that create radio frequency interference (RFI). RF shielding involves surrounding possible sources and victims of an electromagnetic field, cable lines, and electronic device circuits with barriers built of conductive and magnetic materials to isolate them from their surroundings. Read More…

RF Shielding The "RF" in RF shielding stands for radio frequency. This type of shielding is intended to protect electronic devices from radio frequency electromagnetic radiation.
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Leading Manufacturers

San Fernando, CA  |  818-764-8222

Spira Manufacturing Corp. offers the most reliable EMI gaskets & shielding for the electrical / electronic industries to meet required EMC/EMI shielding regulations.

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Spira Manufacturing Corporation $$$

Lancaster, NY  |  716-684-7600

Sealing Devices is a leading North American distributor and fabricator of EMI shielding products, including conductive elastomers, Soft-Shield® low closure force gasketing, windows, conductive adhesives, formed-in-place parts, vents and elastomers.

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Sealing Devices Inc. $$$

Randolph, NJ  |  973-366-0080

Omega Shielding Products is your premier source for high-performance, metal-stamped, fingerstock EMI RFI shielding solutions. An ISO9001:2008 certified manufacturer of EMI shielding and RFI shielding products, Omega offers an extensive line of EMI gaskets, rings and more to meet your specific needs. Omega Shielding Products maintains the highest levels of product quality and customer satisfaction.

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Omega Shielding® Products $$$

West Boylston, MA  |  508-835-6225

Central Coating is the largest applicator of coatings in the Northeast. We specialize in the application of EMI shielding, industrial, textured and conformal coatings; form in place gaskets, pad printing, silk screening and value-added operations. ISO 9001:2015 registered, Central Coating specializes in the custom application of EMI shielding material using robotic and manual application methods.

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Central Coating Company, Inc. $$$
placeholder image Spira Manufacturing Corporation Sealing Devices Inc. Omega Shielding® Products Central Coating Company, Inc.

rf shielding

Radio Frequency interference can impair a device's electrical circuits from operating normally. The characteristics of the shielding material, the design, thickness, the electromagnetic frequency, and the magnitude of any discontinuities on the shield all affect how well RF shielding reduces interference.

Different devices respond differently to radio frequency interference. Communication and electronic devices may operate worse as a result of radio frequency interference. Radiofrequency interference is a common problem in electronics and is not fixed in the actual world. Electrical circuits can both emit and also be susceptible to radiofrequency electromagnetic impulses. The use of RF shielding protects equipment from the negative effects of RF interference.

Materials for RF Shielding

The ability to reflect or block the electrical component of electromagnetic waves is made possible by a material's high conductivity. Therefore, the frequency of the electromagnetic wave, the geometry of the shield, and the material's conductivity and magnetic permeability all affect how successful the shielding is. For example, a material with a high magnetic permeability can provide low reluctance lines of magnetic flux, which is useful for absorbing and pulling magnetic fluxes around the shielding region. Some of the materials that are commonly used include:

Steel

In contrast to copper alloys and aluminum, steel and other ferromagnetic materials offer low-frequency magnetic field shielding. Depending on the type of steel, they have a variety of RF shielding plus mechanical qualities. Low-carbon steels have increased permeability and saturation points compared to high-carbon steels. The saturation point is the magnetic flux density a material can hold at a particular thickness.

Copper

Due to its superior ability to attenuate and absorb electromagnetic waves' magnetic and electric components, copper is the most reliable material for RF shielding. In addition, it is electrically very conductible. Since copper is simple to produce and can be shaped into a wide variety of desired shapes, copper-based shields can be relatively easily attached as radiofrequency shields to electronic devices. In addition to these properties, copper is resistant to oxidation brought on by the environment and is naturally resistant to corrosion.

Nickel Silver

In very corrosive settings, nickel silver, also known as copper alloy 770, is frequently utilized as a radiofrequency shielding material because it comprises various proportions of nickel, copper, and zinc. It works well for attenuating RFI in the mid-kHz to GHz frequency range. In addition, they are perfect for building RF shielding for MRI equipment, which is prohibited from using magnetic waves because they have a permeability of 1.

nickel silver rf shielding

Conductive Fabrics

Some conductive fabrics are lightweight textiles coated or combined with metals, including nickel, copper, silver, gold, and carbon. Polyester, silk, cotton, and nylon fibers create conductive fabrics. These materials reduce RFI in confined rooms and spaces and have strong shielding efficiency.

conductive fabrics

Aluminum

Thin aluminum sheets block low-frequency radio waves. Electronic equipment enclosures can be made of aluminum to provide built-in RF protection. However, aluminum has a conductivity of between 50 and 60 percent less than copper. Hence aluminum RF shielding needs to be thicker to be as effective at shielding as copper.

aluminum screen as rf shielding

Types of RF Interference

Electromagnetic waves are made up of opposing electromagnetic and electric waves that oscillate. The wavelength and frequency of electromagnetic waves are used to describe them. The electromagnetic spectrum serves as a representation of these waves' continuity.

Electromagnetic interference occurs when undesired electromagnetic waves or impulses interfere with an electrical device's ability to work properly. It is frequently referred to as noise or electromagnetic noise. It is possible to categorize radiofrequency interference based on its duration, source, and bandwidth.

Source

Artificial sources of electromagnetic radiation, which can impact nearby equipment and gadgets, are emitted by electronic and electrical devices. The unnatural causes of RFI are divided into intentional and unintentional sources.

Natural Sources

Astronomical events like solar flares, lightning strikes, static electricity, dust storms, cosmic noise, and snowstorms cause RFI to occur naturally.

Duration

Continuous radiofrequency interference (RFI) describes the RFIs that a source constantly emits by radiation or conduction. In contrast, radiofrequency impulse interference happens suddenly or for a very brief period. Impulse RFI frequently upsets the voltage and current balance of linked neighboring devices due to switches and illumination. Both types can be produced from natural or artificial sources.

Bandwidth

Bandwidth is the frequency range in which the RFI is present.

Broadband

There is no single, discrete signal where the interference manifests itself. A natural or artificial source might cause several types of broadband RFI. The sun, which obstructs useful satellite signals from communication equipment, is a naturally occurring cause of this interference.

  • Radiative coupling
  • Magnetic coupling
  • Conductive coupling

Forms of RF Shielding

Some of the typical RF shielding methods are:

  • Cable shielding
  • Shielded vents
  • Gaskets
  • Board-level shielding
  • RF-shielded facilities
  • Solid enclosures
  • Wire mesh and screens
  • O-rings

RF Shielding Informational Video

 

EMI Shielding Power Pages

EMI Shielding

EMI Shielding

EMI shielding is a technique of creating a barrier that prevents leakage of strong electromagnetic fields that can interfere with sensitive devices and signals. They can be installed to isolate the electromagnetic field source or as an enclosure of the device that needs protection...

RF Shielding

RF Shielding

Radiofrequency (RF) shielding is the practice of blocking radiofrequency electromagnetic signals that cause radio frequency interference (RFI). RFI can disrupt the electrical circuits of a device from working normally...

Electronic Enclosures

Electronic Enclosures

Electronic enclosures are box-like structures that are designed to protect, contain, and enclose electronic components such as switches, relays, printed circuit boards (PCB), integrated circuits, power supplies, processors, etc...

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