| 摘要 |
PROBLEM TO BE SOLVED: To provide a wiring board in which the isolation of a signal interconnection conductor is ensured satisfactorily by a through conductor, in which a stable grounding network is formed of a grounding conductor layer and the through conductor, and in which a high-speed signal exceeding, e.g. 10 GHz can be propagated with good efficiency and precisely. SOLUTION: In this wiring board on an insulating base body 1 which is formed by laminating a plurality of insulating layers 1a, 1b, a signal interconnection conductor 3 which is used to propagate a high-frequency signal is arranged and installed, and a grounding conductor layer 4a which is faced with the signal interconnection conductor 3 via the insulating layer 1b is arranged and installed. At least one row each of many through conductors 5 connected to the grounding conductor layer 4a are arranged and installed on both sides of it along the signal interconnection conductor 3. In addition, the through conductors 5 are formed in such a way that their length along the signal interconnection conductor 3 in their cross section is made longer than the length in a direction at right angles. As a result, it is possible to effectively prevent electromagnetic waves from being leaked to the outside from the signal interconnection conductor 3.
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