Patent attributes
A transmission cable includes multiple signal lines formed on one side of an insulation layer and a ground line between the signal lines. The ground line is electrically connected to a shield layer formed on a back surface side of the insulation layer and to a noise suppressing layer having a high electric resistance value than the shield layer via a metal bump embedded and formed in the insulation layer. The noise suppressing layer has a function to suppress an unwanted emission and/or a noise and has a function as an etching barrier layer serving as an etching stopper in a step for forming the metal bump. Thus, the transmission cable can suppress an increase of an electric resistance and a connection resistance between the ground line and the shield layer.
