| 摘要 |
A flexible printed circuit board includes: a base film that has electrical insulation property; a conductive pattern that is formed on the base film and including a pair of differential signal lines and a ground line; an insulating layer that is formed on the conductive pattern; a conductive layer that is formed on the insulating layer; and a connecting portion that electrically connects the ground line and the conductive layer through a penetration hole formed on the insulating layer.
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