EMI absorbers are effective in near field environments and specifically designed to eliminate electronic noise in a broad range of frequencies from 10 MHz to 60 Ghz. They work by absorbing the EMI field generated by today's high-speed electronics, eliminating emissions, crosstalk, and oscillations. They are flexible or rigid rubber and polymer sheets that are loaded with specific filler particles which are nonconductive, so they can be directly applied to circuits and traces without risk of shorting out IC pins. They are supplied in sheet or roll form for easy cutting into custom shapes, and once cut, can be placed in tape and reel format for automatic assembly. Many are certified UL94V-0 and are supplied in a variety of thicknesses. Custom molded shapes are also available.
EMI shielding simply separates internal electronics from outside sources to keep EMI noise out (susceptibility) or contain EMI noise within (emissions). Ideally, enclosures would be a solid metal box, however, once openings or apertures become necessary for cables, LED, fans etc., these devices radiate like antennas. Shielding cans, EMI tape, conductive gaskets and coatings are common EMI shielding methods that may not completely solve the problem especially with higher frequencies in today’s advanced electronics. Absorbing materials are used to mitigate undesired noise at the source. Meaning, EMI Absorber can be placed on the chip, board or any other radiating noise source because it is non-conductive. EMI absorbers can also be used to eliminate emissions on cables or traces.