EMI & EMC Shielding: Materials and Enclosures Providers

EMI and EMC shielding materials and enclosures are essential for protecting electronic devices from electromagnetic interference and ensuring compliance with industry standards. This guide highlights top providers of shielding solutions, including materials like conductive coatings, metal enclosures, and gaskets, designed to enhance electromagnetic compatibility in various applications.

Popular vendors include Holland Shielding Systems, Laird Technologies, Stockwell Elastomerics, Shielding Solutions Limited, eMEI Group, 3M, RAMAYES, Aeroflex, Willtek Communications, and Keysight & R&S.

EMI stands for Electromagnetic Interference. If one device’s radiated field is not properly shielded or grounded, it can affect the functioning of another nearby device. EMC stands for Electromagnetic Compatibility. If one device’s conducted electric noise is not controlled, it can affect a nearby device. EMI and EMC are very important for any electronic/wireless equipment/devices.

EMI/EMC Measurements

EMI/EMC Testing includes the following measurements on the Device Under Test (DUT):

• Conducted Emission
• Radiated Emission
• Conducted Immunity
• Radiated Immunity

Various standards, such as European standards for EMC, have been developed to streamline the EMI/EMC certification process. A list of EMC standards followed worldwide can be obtained from this link: https://www.ce-mag.com/archive/03/ARG/emc_standards.html

CISPR (International Special Committee for Radio Interference) develops standards for radiated/conducted EMI (Electromagnetic Interference). CISPR is part of IEC (International Electrotechnical Commission).

Figure is taken from Wikimedia commons. Figure depicts four modes of EMI coupling i.e. Radiative, Inductive, Capacitive, Conductive.

Figure is taken from Wikimedia commons. Figure depicts two modes of electromagnetic coupling i.e. radiative coupling & conductive coupling.

EMI EMC Shielding Materials

The following companies manufacture shielding materials, gaskets, and more, used for meeting EMI/EMC specifications for electronic/wireless product manufacturers.

• Holland Shielding Systems BV - www.hollandshielding.com

  • Products include EMI/IP gaskets, shields, thermal materials, absorbers, ferrites, PCB shielding, and more EMI/EMC solutions.
  • info@hollandshielding.com

• Laird Technologies - www.lairdtech.com

  • EMI shielding materials and various types of Gaskets, microwave absorbers, conductive tapes, ferrite products (ferrite plate, ferrite chip inductor, ferrite cable cores, and more).
  • EMI-AmericasSales@lairdtech.com

• Stockwell Elastomerics - www.stockwell.com

  • EMI shielding materials and gaskets.

• Shielding Solutions Limited - www.rfi-shielding.com

  • EMI/RFI shielding materials, components, conductive adhesives, shielding gaskets, and more.

• eMEI Group - www.emeigroup.com/en/

  • Thermal management and adhesive materials, inductive components, EMI shielding materials, and more.

• 3M - www.3m.com

  • 3M has EMI/EMC products, which include adhesive tapes, gaskets, EMI absorbers, EMI shielding tapes, and EMC test and measurement instruments.

EMI EMC Enclosures

The following companies manufacture enclosures that help perform DUT measurements without the effect of any Electro-Magnetic Interference. The enclosures have openings to bring cables outside. They also house RS232 or RJ45 ethernet ports for external monitoring and control. The enclosures house connectors for AC as well as DC power supply connectivity to the DUT. As the need arises, companies are working toward providing other interface ports as well.

• RAMAYES - www.ramayes.com

  • Provides EMC, Microwave, RF, and environment test and measurement systems. Includes RF shielded test enclosures, RF shielded tents, RF shielded pouches, RF shielded cabinets, connectors, and more.

• Aeroflex - www.aeroflex.com

  • Aeroflex Model 4933 is an RF shielded enclosure.

• Willtek Communications, Acquired by Aeroflex - www.willtek.com

  • Model- 4933 RF Shield box extra large in size.

EMI and EMC Test Equipments

The following are test equipment manufactured by various companies for EMI, EMC, and EMS measurements. These equipments are ideal for pre-certification and pre-compliance testing.

• Agilent Technologies - www.home.agilent.com, ERETEC - www.eretec.com

  • Agilent Technologies Inc is a leader in RF and wireless test and measurement for all your needs. They have solutions for all the wireless technologies viz. WLAN, WiMAX, LTE, etc.
  • Agilent has the following products for EMI EMC test needs:
    • EMC Scanner with controlling software. Models available are RCE 25 and RCE 40.
    • EMI Receiver Model N9038A
    • EMI Measurement software application N6141A
  • Eretec has EMC chambers, antennas, and test chambers.

• Aeroflex - www.aeroflex.com

  • Model 3250 Spectrum analyzer: It is ideal for EMC measurements and EMI receiver testing.

• R&S - www.rohde-schwarz.com

  • Model: ESCS30 EMI receiver and EMI analyzer functionality.
  • CEMS 100 test platform is ideal for pre-certification and pre-compliance EMS (Electromagnetic susceptibility) and EMI measurements. This product provides measurements as per IEC/EN 61000-4-3 standard.
  • ESRP EMI test receiver and spectrum analyzer is available from Rohde & Schwarz.

• ETS Lindgren

  • ETS Lindgren has developed the following EMC test equipment which are very useful for pre-certification testing.
  • Model 2171B Boresight antenna tower designed and developed to meet ANSI standard C63.4. This product is useful for measurements above the frequency of 1GHz.
  • Red Edge series of products are aimed at helping the EMI/EMC community to negate the effect of high altitude EM pulse and international EMI threat.
  • Models 3116C-PA and 3117-PA which are double ridged waveguide horn and Log antenna with matched preamplifiers.

Conclusion

Choosing reliable EMI and EMC shielding providers is crucial for maintaining device performance and regulatory compliance. Explore these trusted suppliers to find effective solutions tailored to your application needs.