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The world of electromagnetic interference (EMI) and radio frequency interference (RFI) is vast and complex. It’s a field that many engineers and technicians encounter in their daily work, but it can also be difficult to grasp the basics of EMI and RFI. This article provides an overview of EMI and RFI contacts, fingerstocks, and gaskets—their application fields, and how they work.

What are EMI and RFI Contacts?

EMI and RFI contacts are designed to protect against or prevent both EMI and RFI interference originating from signals sent from electronic circuits and electromagnetic fields. The contacts provide an electrical protection point on the casing of electrical equipment, and can be used in virtually any application in which voltage is present. EMI/RFI contacts can be found in many industrial, consumer, and military applications including medical, outdoor, transportation, and aerospace equipment.

The contacts feature a conductive metal that is usually controlled by a spring contact that is press-fit into the assembly and which makes contact to lid, door or frame, when the fasteners are tightened. It also provides a low-resistance path to the ground. The contacts can be soldered, plated or wedge-clamped to the grounding surface, depending on the application requirements.

What are EMI and RFI Fingerstocks?

EMI and RFI fingerstocks are flat conductive components that are designed to conduct electricity and shield electronic devices from EMI and RFI interference. These flat stock components are typically made of a conductive material, usually stainless steel, copper or aluminum, and are designed to fit into the gap between two components to maintain the integrity of the electromagnetic (EM) field by providing a low-resistance barrier.

Fingerstocks are available in various shapes and sizes to fit different gap widths and times. To ensure proper shielding, the fingerstock should be as wide as possible in the gap without causing binding or creating an open contact. It should also fit snugly without damaging the adjacent components.

What are EMI and RFI Gaskets?

EMI and RFI gaskets are flexible components, usually made of a conductive material such as rubber, silicone, or foam, which are designed to provide an electrical and airtight seal between two components. The gaskets act as a barrier between the components to protect them from EMI and RFI interference, and can be used to form a protective ‘faraday cage’ around the device, ensuring that no interference from outside sources enters or leaves the device.

EMI and RFI gaskets can be installed around the exterior of a device to protect its internal components from EMI and RFI, or can be placed within the device itself to protect individual components. Most EMI and RFI gaskets are self-adhesive, allowing for easy installation and adaptation to non-shielded enclosures.

Conclusion

EMI and RFI contacts, fingerstocks, and gaskets are essential components of any electrical or electronic device, providing a critical protective barrier against EMI and RFI interference and ensuring that devices can operate reliably—even in challenging environments. As technology continues to evolve, so too must the design of these components to ensure optimal performance.

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