ELECTROMAGNETIC NOISE SUPPRESSION SHEET, FLAT CABLE FOR HIGH-FREQUENCY SIGNALS, FLEXIBLE PRINTED CIRCUIT BOARD, AND PROCESS FOR PRODUCING THE ELECTROMAGNETIC NOISE SUPPRESSION SHEET
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United States of America Patent
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app pub date -
Mar 31, 2014
filing date -
Apr 11, 2007
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Abandoned
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Abstract
An electromagnetic noise suppression sheet obtained by using combination of a conductive carbon and spinel ferrite particles having a cumulative 50% volume particle diameter of 1 to 10 μm, can exhibit an excellent transmission attenuation power ratio and a reduced return loss in a near electromagnetic field, and is suitable for high-density mounting. The electromagnetic noise suppression sheet of the present invention can be produced by the process of the present invention which includes the steps of applying a coating material in which the conductive carbon and the spinel ferrite particles having a cumulative 50% volume particle diameter of 1 to 10 μm are dispersed, to form a coating film having a thickness of 10 to 100 μm after dried, and subjecting the resulting coating film to thermoforming under pressure.
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