What is EMI/RFI Shielding?
When electromagnetic waves are exposed to conductive surfaces like wires or cables they generate unexpected current within these wires. This electromagnetic interference (EMI) or radio frequency interference (RFI) in the case of radio waves alters existing currents and disrupts the normal operation of electrical devices. Seams and openings in electronic devices provide avenues for uncontrolled energy waves to enter or exit a device, causing erratic performance.
To minimize internal interference and crosstalk, we utilize EMI shielding or EMI absorbers to protect from these errant electromagnetic waves. EMI shields are typically constructed from sheet metal, metal screens, metal foams or grounded copper or nickel loaded ink coating. The effectiveness of an EMI shield depends upon material, material thickness, the shielded volume size, the electromagnetic frequency and the overall shape of the shielded area.
EMI SHIELDING: Boyd’s LectroShield fabric-over-foam, conductive foam, elastomers, adhesives, and metal foils are designed to manage interference, and improve reliability and efficiency in device performance. These solutions are ideal for EMI/RFI shielding applications requiring excellent shielding performance as well as high conformability, compressibility, cushioning, tight contact and dimensionally tight tolerances. Boyd’s EMI shielding can be designed for electronic devices that need soft cushioning, electrical conductance and tight contact.
EMI ABSORBER: Boyd’s LectroShield EMI absorbers are designed to eliminate electrical “noise” in sensitive devices. Where EMI shielding reflects electromagnetic waves, an EMI absorber retains the energy from the waves protecting the device from interference and crosstalk. EMI absorbers are commonly used last minute fix to manage EMI/RFI when device redesign is not possible.
EMI absorbers can be flexible or rigid, easy to die cut, and available with PSA for easy application. They are dielectric so they can be used near metals and do not require an electrical ground. For these reasons, EMI absorber applications are diverse and vary greatly from a more traditional EMI shielding gasket.
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