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This paper discusses a new electromagnetic interference (EMI) shielding for conductors. The shielding was especially developed to contain or exclude interference energy initiated by both magnetic and electrical fields over a broad frequency range. Incorporating a unique shielding concept, the new shielding minimizes (1) interference propagation from power or signal wiring, (2) low to high frequency (60 c/s to 10 Ge/s) interference pickup from external sources, and (3) requirements for segregation and special routing of power and signal wiring and interconnecting cables. Composed of two or more layers of braided magnetic materials, the shielding has demonstrated significant improvements in shielding effectiveness compared with conventional shielding over standard conductors and coaxial cables. In-service use has attested to its effectiveness.
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Joseph W. Murphy (1966) studied this question.
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