| 摘要 |
A circuit board is provided to reduce electromagnetic interference and the distortion of a first signal by forming a return current path in a second penetration electrode. A board body(10) has a first side, a second side and a via hole. The via hole passes through the first side and the second side. A dual via structure(20) has a first penetration electrode and a second penetration electrode. The first and second penetration electrodes are arranged in an inner side of the board body formed by the via hole. The first and second penetration electrodes are electrically insulated. A first wiring(30) is electrically connected to the first penetration electrode. A second wiring(40) is electrically connected to the second penetration electrode. A first signal is applied to the first wiring. A second signal is applied to the second wiring. The first signal is a data signal. The second signal is a ground signal.
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