DOUBLE-SIDED CIRCUIT SUBSTRATE SUITABLE FOR HIGH-FREQUENCY CIRCUITS
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United States of America Patent
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Aug 5, 2015
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Aug 7, 2014
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Abstract
Provided is a double-sided circuit substrate being a laminate of: a composite material comprising a fluorine resin and a glass cloth; and a copper foil having a two-dimensional roughness Ra in a mat surface (a surface that comes in contact with the resin) of less than 0.2 μm. Ideally, a surface of the fluorine resin has an O content of at least 1.0%, as observed using ESCA.
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