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What is EMI?  NIST defines EMI as "an electromagnetic disturbance that interrupts, obstructs, or otherwise degrades or limits the effective performance of electronics/electrical equipment.” Most conventionally, EMI is understood as undesirable high-frequency signals, and EMI filters as devices that suppress such signals while preserving the "good" ones.         

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U.S. Patents 10,263,591; 9,076,806; others pending. 
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