Patent ID: 7919716

Claim:
A printed wiring board comprising: an insulating layer; a first conductor pattern on the insulating layer configured to be a signal line; and a second conductor pattern on the insulating layer, the second conductor pattern comprising a main portion configured to be a power source layer or a ground layer, a conductor line configured to be a signal line, a clearance between the main portion and the conductor line, a plurality of first slits, and a plurality of second slits extending in a direction intersecting the first slits, the first slits and the second slits being uniformly provided in an area which comprises the conductor line and an area which does not comprise the conductor line, and the first slit and the second slit next to the conductor line being shorter in length in order to avoid the conductor line and being connected to the clearance, and the first slits and the second slits being separate from one another and aligned alternately.