The is an EMI absorber. This is a thin sheet of polymer resin with magnetic filler, acrylic pressure sensitive adhesive and release liner. It has enhanced absorption at lower frequencies below 1GHz.
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Backing thickness of 1mm
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Low EMI and RF noise in electronic systems
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Apply to noisy traces, IC"s and reflective surfaces in an enclosure
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Good absorbing frequency range from 50MHz to 10GHz