Abstract
In a printed wiring board, slotted portions are provided in a grounding layer so as to be positioned under communication lines print-wired on a printed wiring board. Capacitors are provided between the slotted portions and external connecting terminals. Two units of oppositely directed magnetic flux of an equal level occur for the slotted portions by common mode currents flowing in the communication lines. These two units of magnetic flux offset each other to lower a common mode noise level.
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