| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit board in which a specified performance can be ensured stably by reducing the dimensional variation rate substantially uniformly in two orthogonal directions at the time of etching or annealing while achieving a production target as well as the mechanical strength and permittivity. SOLUTION: A prepreg 3, 3 composed of a glass cloth arranged on each side of a PTFE sheet 2 comprises a set of two sheets of prepreg 3-1, 3-2 each laminated crosswise by 90 deg. in the warpwise direction, and a specified circuit pattern is formed of a copper foil 4, 4 on the outer surface of the prepreg 3, 3. |
