US 2015/0091674 A1Published application

High-frequency transmission line and electronic device

AssigneeMurata Manufacturing Co., Ltd.

InventorsNoboru KATO, Satoshi ISHINO, Jun SASAKI, Kuniaki YOSUI, Takahiro BABA, Nobuo IKEMOTO

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Abstract

A transmission line portion of a flat cable includes first regions and second regions connected alternately. In the first region, the transmission line portion is a flexible tri-plate transmission line including a dielectric element including a signal conductor, a first ground conductor including opening portions, and a second ground conductor which is a solidly filled conductor. In the second region, the transmission line portion is a hard tri-plate transmission line including a wide dielectric element including a meandering conductor, and a first ground conductor and a second ground conductor which are solidly filled conductors. A variation width of the characteristic impedance in the second region is larger than a variation width of the characteristic impedance in the first region.

Claims19

Dependent claims

A high-frequency transmission line comprising:

a flexible flat dielectric element elongated in one direction, the dielectric element having a predetermined width in a direction perpendicular or substantially perpendicular to a longitudinal direction and having a predetermined thickness;
a signal conductor disposed in the dielectric element and configured to extend along the longitudinal direction;
and
a first ground conductor opposing the signal line conductor and extending in the longitudinal direction;
wherein
at least one of the signal conductor and the first ground conductor has a characteristic impedance cyclically varied along the longitudinal direction, and includes a first region and a second region with different variation widths of the characteristic impedance;
and
the variation width of the characteristic impedance in the second region is larger than the variation width of the characteristic impedance in the first region.

5 more elements

Dependencies are inferred from the claim text.