PRINTED WIRING BOARD

摘要

PROBLEM TO BE SOLVED: To provide a printed wiring board in which a high-frequency characteristic of a high-frequency signal is not deteriorated and an electromagetic noise produced from a built-in electronic component can be controlled.

SOLUTION: A signal transmitting wiring 105 is located in a electrically insulating layer 103 and an auxiliary wiring 104 is positioned in the electrically insulating layer 103 electrically-insulated from the signal transmitting wiring 105. At least a part of the auxiliary wiring 104 is covered with a electromagnetic shield layer 106. Consequently, a noise radiated from inside/outside the printed wiring board is inhibited without deteriorating the characteristic of the signal transmitted through the signal transmitting wiring 105.

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