Shop Arrow.com’s selection of EMI absorbers and RF absorbing material from industry-leading manufacturers such as 3M, KEMET Corporation, Laird, and more. What is an EMI absorber? EMI absorbers (commonly referred to as conductive foam) are near field absorbers of radiation used in electronic systems to reduce or eliminate electromagnetic interference. Absorbers typically work from a few hundred MHz into the high GHz regions. Absorbers work by dissipating the EMI field generated by the high-speed electronics of the PCB and components they are placed upon. This can reduce or eliminate emissions and crosstalk between signals on printed circuit boards.EMI Absorber MaterialEMI Absorbers are typically flexible polymers that are available in sheet, tape, and foam form, and can be cut to any two-dimensional shape required. They are usually flexible, containing soft magnetic flakes suspended in a polymer resin with adhesive attached so they can be stuck onto a surface. Adhesives are usually pressure sensitive. They are usually insulators, and can be flame retardant. Some absorbers contain multiple layers to improve performance.EMI Absorber ApplicationsAbsorbers are used in a variety of applications. This includes mobile phones, computers, and cameras. They are also effective in absorbing radar and microwaves. They are usually utilized in conjunction with shield technologies to allow products to meet tight FCC compliance regulations for the equipment. Some absorber products are available in a tape form. They can be used in products with metallic enclosures to dampen internal resonances (cavity resonance).Important characteristics of EMI absorbers include the attenuation across a broad frequency spectrum. Also important is the impact the material can have on nearby traces and components placed on the PCB that are in proximity to the material. Designers have to take care to ensure that this material does not affect the impedance and loss characteristics of any RF circuitry, particularly inductors. 더 읽기 읽기 안 함