| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit board which propagates high-speed signals without difficulties, even when it uses an insulating base (e.g., glass/epoxy base) which has been usually used and can be manufactured by the use of an existing infrastructure for manufacturing a circuit board. SOLUTION: The circuit board 100 is formed of an insulating base material 110, composed of resin 101 and a sheet-like fiber base material 102 impregnated with it, and a part 104, where fiber constituting the fiber base material is not present in the thickness direction of the insulating base material, is provided in a part of the insulating base material. COPYRIGHT: (C)2005,JPO&NCIPI
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