| 摘要 |
PROBLEM TO BE SOLVED: To provide a wiring board which prevents exfoliation of insulating layers and wiring layers or occurrence of cracks and reduces a high frequency transmission loss based on a skin effect. SOLUTION: In the wiring board including the insulating layers and the wiring layers, wiring layers 2, 4, 6, 8 are constituted of metal parts and intermediate portions of the metal parts in the direction of thickness (second metal layers 2b, 4b, 6b, 8b) are constituted of porous metals of which porosity is greater than that of interfacing portions with the insulating layers. COPYRIGHT: (C)2006,JPO&NCIPI |
