Patent ID: 9635753
Date: 2017-04-25
CPC Classifications: H05K

Claim:
1. A wiring board comprising: an insulating layer having a relative permittivity of 4.5 or more; a via-hole penetrating from an upper surface to a lower surface of the insulating layer to electrically connect the upper surface to the lower surface of the insulating layer; a wiring formation layer formed on a surface of the insulating layer; and a grounding or power supply conductor formed on a surface opposite to the surface of the insulating layer on which the wiring formation layer is formed, wherein the wiring formation layer is formed of a plurality of strip-shaped conductors extending in parallel to each other, and an insulating resin portions filled in at least between the strip-shaped conductors, the grounding or power supply conductor is formed to partially face the strip-shaped conductors, and a ratio of the relative permittivity of the insulating layer and a relative permittivity of the insulating resin portion is at least 1.125.