Patent ID: 11864313
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. A multilayer wiring substrate, comprising:
a dielectric base body that is a laminate including a plurality of dielectric sheets stacked on top of each other;
a signal line in or on the dielectric base body;
a ground conductor in the dielectric base body, the ground conductor and the signal line facing each other in a stacking direction of the plurality of dielectric sheets, the ground conductor overlapping the signal line when viewed in plan in the stacking direction; and
a graphite sheet in the dielectric base body, the graphite sheet and the signal line facing each other in the stacking direction without the signal line being located between the graphite sheet and the ground conductor; wherein
the signal line is on an upper side in the stacking direction;
the ground conductor is on a lower side in the stacking direction;
an upper surface of the graphite sheet is coplanar with an upper surface of the ground conductor or is located below the upper surface of the ground conductor;
an entirety of the graphite sheet is embedded inside of the dielectric base body such that no portion of the graphite sheet is exposed from the dielectric base body; and
the graphite sheet is a graphene sheet including a plurality of layers of graphene stacked directly on one another.