Patent ID: 11923123
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A multilayer substrate comprising:
an element assembly including a first insulating layer and a second insulating layer which are stacked in layers in a layer stacking direction such that the second insulating layer is located at a first side of the first insulating layer with respect to the layer stacking direction;
a first coil pattern disposed on a first principal surface of the first insulating layer that is on the first side of the first insulating layer with respect to the layer stacking direction; and
a second coil pattern disposed on a first principal surface of the second insulating layer that is on a first side of the second insulating layer with respect to the layer stacking direction; wherein
each of the first coil pattern and the second coil pattern has a two-dimensional spiral shape including turns when viewed from the layer stacking direction;
when viewed from the layer stacking direction, at least a portion of a first area in which the first coil pattern is disposed and a second area in which the second coil pattern is disposed overlap each other;
a maximum thickness of the second coil pattern is smaller than a maximum thickness of the first coil pattern;
when viewed from the layer stacking direction, the second coil pattern includes an overlapping portion which overlaps the first coil pattern or includes a portion which is located between two radially adjacent portions of the first coil pattern;
an imaginary line is defined by connecting points at which a thickness of the first coil pattern reaches a maximum in cross-sectional views of the first coil pattern along lines perpendicular to a direction in which the first coil pattern extends;
when viewed from the layer stacking direction, there is no portion in which the imaginary line overlaps the second coil pattern in a portion in which the imaginary line extends side by side with the second coil pattern;
when viewed from the layer stacking direction, the second area is within the first area;
when viewed from the layer stacking direction, an outermost ring of the first coil pattern does not overlap with an outermost ring of the second coil pattern;
the first coil pattern includes an underlayer conductor disposed on the first principal surface of the first insulating layer and a plated layer disposed on the underlayer conductor; and
the second coil pattern is defined by only a single conductor layer.