Patent ID: 9549460
Date: 2017-01-17
CPC Classifications: H01P,H05K

Claim:
1. A printed wiring board comprising: an insulating substrate; a first signal line that constitutes differential signal lines formed on the insulating substrate and includes a curved portion; a second signal line provided along the first signal line and side by side inside the curved portion; and a ground layer formed for the first signal line and the second signal line via an insulating material, the ground layer including a first ground layer corresponding to a first region and a second ground layer corresponding to a second region, the first region being defined based on a position of the first signal line and having a first predetermined width, the second region being defined based on a position of the second signal line and having a second predetermined width, the first ground layer having a remaining ratio lower than a remaining ratio of the second ground layer, the first predetermined width of the first region being three times or more of a circuit width of the first signal line, the second predetermined width of the second region being three times or more of a circuit width of the second signal line.