Patent ID: 8139372

Claim:
A printed circuit board having an insulation layer and a conductor layer, the printed circuit board comprising: a center portion having an element mounting area; a periphery portion surrounding the center portion; a slit pattern partitioning the periphery portion and the center portion; and a GND pattern located in the conductor layer, the GND pattern extending through the center portion and the periphery portion, wherein: the center portion extends through the insulation layer and the conductor layer in a thickness direction of the insulation layer and the conductor layer; the periphery portion extends through the insulation layer and the conductor layer in the thickness direction of the insulation layer and the conductor layer; the slit pattern including a slit portion and a connected portion; the slit portion extends through the insulation layer and partially extends through the conductor layer in the thickness direction of the insulation layer and the conductor layer; and the connected portion connects the center portion and the periphery portion.