EMI filters are passive electronic devices which block conducted electromagnetic interference generated by surrounding electronics. EMI, or electromagnetic interference, is the magnetic field which is created by electrical currents; EMI can travel along wires, electrical circuits and conductors, while radio frequencies (RF) are radiated electromagnetic “noise,” which travels through the air as radio waves.
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Spira Manufacturing CorporationNorth Hollywood, CA 818-764-8222 Spira Manufacturing Corporation is committed to manufacturing quality products to ensure that you, the customer, will be able to make an informed decision and choose the best product for your design. Each part manufactured by Spira fills a very specific need in the market, not found in other EMI filters. Let Spira become your solution, call or visit their website today!
Compac Development CorporationBay Shore, NY 888-546-3313 Established in 1976 as versatile EMI shielding products manufacturers, Compac Development proudly offers speedy and reliable delivery that sets them apart from other leading EMI shielding products companies. With a wide range of EMI shielding products offered, Compac Development strives to meet assorted applications with standard EMI shields, but also offers custom options for unique situations.
Magnetic Shield CorporationBensenville, IL 888-766-7800 At Magnetic Shield Corporation, our talented engineering staff will work closely with your personnel to design a custom solution to meet your specific problem. We will then execute that design to produce your EMI filters in a timely fashion, with the quality that has been our hallmark for over 65 years. To discover more services and products we can offer, call or visit our website today.
INTERMARK (USA), Inc.San Jose, CA 408-971-2055 INTERMARK (USA) Inc. recognizes that with the progression of electronic technologies, components in complex systems have become increasingly sensitive to electromagnetic interference. For this reason having the correct EMI filters can be vital to the life of your electronics. Call today for more information on the products and services offered at INTERMARK.
Dexmet CorporationWallingford, CT 203-294-4440 Dexmet Corporation maintains a continuous commitment to quality control and process improvement, including SPC implementation. Ongoing innovations include our unique, strand annealing furnace, as well as a host of other, highly specialized, proprietary equipment. Our EMI filters are at the top in the industry and our responsiveness to customer's needs and our delivery service is unmatched.
Sealing Devices Inc.Lancaster, NY 716-684-7600 Sealing Devices is one of the largest authorized stocking distributors and fabricators of o-rings, EMI filters, adhesives, vents, sponge and sealing products in North America. Here, employees and customers continue to be the primary focus and driver of the company`s growth. To find out more about what Sealing Devices can offer you, be sure to contact the company today.
Equipto Electronics CorporationAurora, IL 800-204-7225 Equipto's heavy duty enclosures serve a wide variety of EMI/RFI suppression needs, and its newest cost-effective, compact R6 shielded enclosure line has the highest level of protection for electronics from Electromagnetic Pulse and Electromagnetic Radiation effects. All are designed to be modular and flexible with a wide variety of accessories. See if our products fit your EMI filter needs.
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EMI filters block the electromagnetic interference which is passed along through isolated power lines and power signals, diminishing electromagnetic "cross-talk" between various electrical devices and appliances running off the same power source. RF filters perform a similar function by blocking specific air-transmitted radio frequencies. Many power strips and high-use outlets have EMI filters built in, although EMI filters may be individually installed on any grounded electrical power source or circuit. Sound, lighting, medical and many other industries which rely heavily on electronic equipment use EMI filters to prevent equipment malfunction or lost communication signals. EMI filters can be an effective way to manage the EMI created on a specific power source or power line, although either RF filters or EMI shielding such as coating, enclosures and gaskets are still necessary to provide full protection from RFI, or electromagnetic interference conducted by radio waves.
Unlike all other types of EMI shielding products, EMI filters do not attempt to block EMI by enclosing electronic equipment in an EMI-absorbing material; instead, EMI filters block high electromagnetic frequencies, allowing normal low frequencies to pass. EMI filters are used to block electromagnetic interference which is conducted through power lines and signals and is not usually effective in blocking air-transmitted RFI. RF filters, on the other hand, are designed to block virtually any type of radio frequency which might interfere with electronic equipment performance; high-pass RF filters block all frequencies below a specific point; low-pass RF filters block all frequencies above a certain point, and band-pass filters are programmed to selectively filter all frequency bands other than those which are desired to pass. Usually attached or integrated into the power source or switch which is to be shielded, as with all types of EMI/RFI shielding, EMI and RF filters work to both block incoming EMI/RF and outgoing EMI/RF. Perforated or mesh EMI shielding materials are also referred to as EMI filters, although these are not the same as EMI and RF filters which block specific frequency transmissions. Often referred to as "honeycomb filters", mesh EMI filters are used in the same way coatings, enclosures and various types of shielding are used to physically block EMI and RFI waves below a certain size.
