EMI and RFI Shielding

 

Shielding the electronic products of the future

Electromagnetic Compatibility (EMC) has become a vital part of any new component design programme, and it’s the ability of the unit to operate without emitting or being susceptible to electromagnetic waves.

However, with the drive for higher integration, smaller electronic devices and faster speeds, problems with both Electromagnetic Interference (EMI) and Radio Frequency Interference (RFI) continue to increase. That’s why manufacturers like you are now required to ensure that their electronic units or systems don’t generate electromagnetic waves at a level that could interfere with or prevent the operation of another component.

To help you achieve this objective, Electromagnetic Interference (EMI) and Radio Frequency Interference (RFI) shielding is used to confine emissions to a certain area within the unit. This shielding is also used to stop external emissions or signals penetrating and corrupting the electronics from outside.

emi-thermal-rfi-shielding-autotrade.jpg
emi-thermal-rfi-shielding-medical-equipment.jpg
 
DSC00423-CONTACT-STRIP-DOUBLE-SIDED.jpg
DSC00337-KNITTED-MESH-SHIELDING-FOR-CABLES.jpg

How the shielding works

The materials work by creating an Electromagnetic Compatibility (EMC) Gasket which maintains good electrical contact between two surfaces – closing gaps between lids on enclosures, cabinet panels, doors or apertures and providing grounding and shielding to reduce or eliminate EMI and RFI.

We can supply these EMC gaskets to you in a range of different materials and formats to meet the requirements of your application. In addition, PCB design has a major impact on EMC for any system, with key factors being PCB layout (board level shielding and grounding) and suppression components (filters, ferrite beads).

EMI Thermal can also provide you with expert design support with technical data sheets and samples for prototyping. We can design and supply you with profile gaskets cut to specified lengths, kiss-cut or mitred to form frame configurations, custom Board Level Shielding products.

We can also help with your inventory management by providing scheduled deliveries, parts available from stock, plus full field sales and commercial support.

 

Our main EMI/RFI shielding product ranges include:

 

Fabric Wrapped Gasket, fabric-over-foam and conductive foam

  • Conductive coated fabric wrapped over soft sponge core

  • Excellent conductivity and shielding efficiency >85dB

  • Supplied in shaped profile strips or custom gaskets with PSA
  • Used on enclosures, panels, chassis, doors 

Spring Finger Contact Strips/Fingerstock

  • Contact strips manufactured in Beryllium Copper or Stainless Steel

  • Supplied in standard lengths or coils

  • Used on frequent access door seals or lids ranging from small hand-held devices to room-sized enclosures

 

 

Board Level Shields (BLS)

  • Supplied as standard one-piece and two-piece surface mount shields
  • Provides isolation of board level components, minimises crosstalk and susceptibility without impacting system speed
  • Two-piece offers flexibility to inspect or repair shielded components without risk of board damage
  • Various profiles and heights available plus custom sizes for volume

Electrically Conductive Elastomer (ECE)

  • The ECE is made from a range of particles/fillers in a silicone or fluorosilicone elastomer
  • Supplied in sheet form or extrusions and custom die-cut shapes, O-rings, gaskets
  • Used for grounding and shielding electronic enclosures against EMI and providing environmental sealing
  • Wide variety of material compounds for galvanic compatibility to mounting surfaces
 

Electrically Conductive Tapes/Copper and aluminium foil and fabric tapes

  • Conductive foil or fabric tape with electrically conductive (or non-conductive) adhesive (PSA) for flexible grounding and shielding

  • Low surface resistivity improves EMI shielding and grounding at bond line and improves electromagnetic compatibility

  • Supplied in a range of tape thicknesses and widths or die-cut gaskets to drawing

  • Used for grounding and bonding flexible circuits and PCBs, attaching EMI shields and gaskets to assemblies, and for cable and harness wrapping

  • Ideally suited for thin or low profile applications with fabric versions available for other lightweight applications

EMI Absorbers/RFI Absorbers

  • Manufactured from magnetic particles in a polymer resin to produce a composite absorber material
  • Supplied in sheet form or cut gaskets
  • Used to reduce EMI noise within enclosures by attaching to cables, flexible connectors, positioning near to LCD Modules or noisy ICs
     

    Flexible Ferrite Sheets and magnetic shielding materials

    • Manufactured by thin, high permeability sintered ferrite with PET film and adhesive tape
    • Used mainly for Near Field Communication (NFC), Radio Frequency Identification (RFID) and Wireless Charging applications
    • Supplied in standard ferrite layer thickness sheets or custom sizes and gaskets cut to your requirements
    • High permeability optimised to 13.56MHz reduces Eddy Current losses and improves antenna read range
    • Improves power transfer efficiency and range between primary sending and receiving antenna coils