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Canted coil springs (also known as slant coil springs) are known for their ability to latch, hold, and lock, but that isn’t all they have to offer.  Canted coil springs can be used to shield electronics from harmful EMI and RFI interferences. In this blog post, we’ll talk about why canted coil springs work so well for such applications, what additional features they offer, and typical applications.

Canted Coil Spring


Why Canted Coil Springs Work Well for EFI/RFI Shielding

In a canted coil spring, the independent coils effectively serve as multiple contact points for grounding or conduction.  This allows for contact to be made even under shock loadings or vibration. Canted coil springs also provide an almost constant force over a considerable compression range.  This makes it possible for them to offer consistent shielding even when surfaces may be uneven or irregular, as well as situations where tolerances may vary considerably. Canted coil springs offer a very reliable, consistent approach to EFI/RFI shielding.

Their conductive shielding properties provide outstanding protection from crosstalk interference.  In addition, it is possible to tune their electrical properties in order to meet specific impedance specifications.  This allows them to be highly customized for providing shielding against specific ranges of both radiated and conductive interference.

Another benefit of canted coil springs is their ability to be implemented in many different types of situations and configurations, including waveguide flanges, radial connectors, coax connectors, connect/disconnect assemblies, and rectangular electronics enclosures.  And they are also a very economical solution to shielding issues.

Additional Features of Canted Coil Springs

Canted coil springs bring many other positive features to the table.  They offer highly controlled insertion and removal forces, providing lightweight, compact, and reliable fastening.  Canted coil springs for EFI/RFI shielding applications are typically made from 330 series stainless steel, hastelloy, and beryllium copper.  They can also be plated with materials such as silver, nickel, and gold. Canted coil springs are easy to maintain, too. They are available in many different configurations, cross sections, and sizes to meet a project’s needs.  

Typical Applications

When used for shielding, canted coil springs are a mainstay of industries such as military and defense, automotive, oil and gas, aerospace, medical devices, semiconductor, telecommunications, and many more.   They can be found in applications as diverse as antenna bases, battery packs, oil and gas exploration sensors, cables, Formula 1 racing systems, high and medium voltage switchgears, green energy generators, orthopedic implants, avionics, and busbars.

Conclusion

The combined shielding, connecting, and conducting made possible by canted coil springs make them an excellent option for designs that involve protection from EMI/RFI interference. Their light weight and reliability also makes them well adapted for use in high frequency, small package applications. If you are searching for a EMI/RFI shielding solution that is effective, dependable, and economical, look into the use of canted coil springs.

 

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