Patent ID: 11936089
Assignee: DENSO CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A transmission line assembly comprising:
a multilayer board comprising:
a plurality of dielectric layers; and
N pattern layers, N being an integer equal to or greater than 4, each adjacent pair of the N pattern layers being arranged to sandwich a corresponding one of the dielectric layers,

the N pattern layers including:
a first pattern layer as a first outer layer;
an N-th pattern layer as a second outer layer, the first and second outer layers constituting respective outermost layers of the N pattern layers; and
second to (N−1)-th pattern layers, each of the second to (N−1)-th pattern layers being sandwiched by a corresponding adjacent pair of the dielectric layers;

an interlayer line that enables a high frequency signal to be transmitted therethrough in a layering direction of the N pattern layers of the multilayer board,
the interlayer line having first and second opening ends;
a first exterior circuit module mounted on the first outer layer;
a second exterior circuit module mounted on the second outer layer,
each of the first and second exterior circuit modules being arranged such that the high frequency signal transmitted through the interlayer line is inputted thereto or outputted therefrom;
ground patterns mounted on the respective second to (N−1)-th pattern layers, each of the ground patterns being located to surround the interlayer line,
the first opening end of the interlayer line being located in the ground pattern of a first target inner layer, the second opening end of the interlayer line being located in the ground pattern of a second target inner layer,
the first target inner layer being one of the second to (N−1)-th pattern layers selected therefrom, the second target inner layer being another one of the second to (N−1)-th pattern layers selected therefrom, the second to (N−1)-th pattern layers except for the first and second target inner layers being referred to as inner layers; and
first and second slits, each of the first and second slits having a band-like shape and being formed through the ground pattern of a corresponding one of the first and second target inner layers to expose a part of one of the dielectric layers, the one of the dielectric layers being adjacent to the corresponding one of the first and second target inner layers, each of the first and second slits having an edge facing the interlayer line, the edge of each of the first and second slits being concavely curved toward the interlayer line.