DOUBLE-SIDED CIRCUIT SUBSTRATE SUITABLE FOR HIGH-FREQUENCY CIRCUITS

摘要

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.