3029564 RF/IF and RFID

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Radiation Field Isolation (RFI) and Electromagnetic Interference (EMI) both have major impacts on the design and performance of electrical systems, and they need to be addressed for effective operation. RFI and EMI contact, fingerstock and gasket materials play a vital role in preventing the emission and absorption of electromagnetic radiation and fields between two or more enclosures. In the case of fingerstock, the contacts are made by riveting (or welding) the gasket material onto the enclosure. The fingerstock and fingerstock plus gasket combination serves to bridge the gap between the two parts with physical contact.

RFI and EMI Contact materials are used to form a physical bridge between two conductive surfaces. They work by capacitively coupling one surface to the other and thus reducing attenuation of noise and radiation emitted from a device. Conventional electrical contact materials such as bronze and phosphor bronze are made of different alloys with specific conductive characteristics, however their use is often limited due to the electrical and thermal properties provided . Therefore, more specialised contact materials are needed to provide effective RFI/ EMI shielding. In addition, the contact material should have robustness for durability and the ability to withstand mechanical forces. Materials such as silver-plated and tin-plated contact materials, nickel-plated molybdenum and cupped-and-rolled conductive elastomers are well-suited for use in RFI/EMI contacts.

Fingerstock and Gaskets provide excellent electromagnetic shielding by reducing the transmission of signals across the boundary. This is achieved by providing a gap between two conductive surfaces which reduces the effect of the fields and shields the equipment from radiation. It is important that the material should be able to withstand the mechanical strain, physical compression and thermal shock that can occur during use.

The range of Fingerstock and Gasket materials is vast and includes metallic materials like stainless steel, copper alloy and bronze, and wire mesh materials such as tinned copper, silver-plated copper, aluminum, and manganese bronze. Non-metallic materials such as foams, fabrics, composites, and elastomers are also used for their superior flexibility and electrical properties. The choice of material will depend on the design, environment and application, and will often involve a combination of materials. The addition of foam or fabric to the design can further reduce RFI/EMI emissions.

RFI and EMI protection is a critical factor for achieving the best performance, and contact, fingerstock and gasket materials are essential components for achieving optimum results. The right selection of materials, depending on the device and environment, will ensure a high level of shielding and reduce the emission and absorption of electromagnetic radiation and fields.

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