| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit board which balances downsizing and inhibition of malfunction caused by element mutual interference, noise and the like.SOLUTION: A circuit board of an embodiment is a circuit board in which a plurality of electronic components are mounted on a printed circuit board and which comprises: a semiconductor device mounted on the printed circuit board; and a first EBG structure provided on the printed circuit board on the side opposite to the semiconductor device, in which an operation frequency of the semiconductor device is outside a cut-off band of the first EBG structure. The first EBG structure has a mushroom structure which includes: an electrode part formed by a first conductor; a batch part which is provided almost parallel with the electrode part and formed by a second conductor and equal to or less than 10 mm square; an insulation layer provided between the electrode part and the batch part; and a via which is provided in the insulation layer between the batch part and the electrode part and connected to the batch part and the electrode part. |
