Patent ID: 9538638
Date: 2017-01-03
CPC Classifications: H01P,H05K

Claim:
1. A high-frequency signal transmission line, comprising: a dielectric element assembly including a plurality of dielectric layers laminated on each other in a lamination direction, the plurality of dielectric layers having substantially the same dielectric constant; a linear signal line provided at the dielectric element assembly; and a first ground conductor provided on a first side in the lamination direction relative to the signal line and including a plurality of openings arranged along the signal line; wherein one of the plurality of dielectric layers that is positioned at an end of the first side in the lamination direction includes an undulating portion provided on a first surface located on the first side in the lamination direction, such that the undulating portion overlaps with the openings when viewed in a plan view in the lamination direction; the undulating portion is defined by grooves provided in the dielectric layer at the end of the first side in the lamination direction, the grooves extending along the signal line in the first surface; the first ground conductor has a ladder-shaped configuration with bridge portions provided between the openings being adjacent to one another; and the grooves overlap with the bridge portions when viewed in a plan view in the lamination direction.