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Cylindrical EMI suppression ferrite cores from RFI

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article image Cylindrical EMI suppression ferrites cores

Steward's cylindrical EMI suppression ferrites provide a cost effective means of reducing common and differential mode EMI.

The cylindrical EMI suppression ferrites cores are frequently used to suppress common mode EMI on the internal and external cable assemblies of electronic equipment. By decreasing the levels of EMI radiated by internal cables, ferrite cores can reduce the cost and amount of overall shielding required to confine EMI within a product's enclosure.

The cylindrical EMI suppression ferrites cores may also be successfully used on power cables that carry digital or analogue signaling. To achieve maximum EMI filtering performance in a given application, select a ferrite with an inner diameter most closely matching the outer diameter of the wire or wire bundle to be filtered.

The in-circuit impedance may be substantially increased by passing 2 turns of the wire conductor through the ferrite core. A typical common mode application might have two conductors passed through a ferrite core. With equal and opposite currents flowing through the core, zero net bias is established through the component and maximum impedance is thus realised from the ferrite.

Wide range of sizes are available with inner diameters ranging from 0.90 mm to 35.65 mm. Precision formed smooth surfaces prevent damage to wire insulation. The cores are available in Steward broad band (28), high frequency (HF) and low frequency (LF) materials. Custom designs are also available.

Steward is represented in Australia and New Zealand by RFI Industries.

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