Patent ID: 8154360

Claim:
A resin multilayer device comprising: a substrate; a first resin layer formed on the substrate; a first balance signal transmission line and a second balanced signal transmission line that are formed electrically independently on the first resin layer; a second resin layer formed on the first and second balanced signal transmission lines and the first resin layer; an unbalanced signal transmission line formed on the second resin layer so as to be opposed to the first and second balanced signal transmission lines; a third resin layer formed on the unbalanced signal transmission line and the second resin layer; and a first GND layer that is formed on the substrate and is located beneath the first resin layer, wherein the first balanced signal transmission line has a first signal input/output end and a first ground end, the second balanced signal transmission line has a second signal input/output end and a second ground end, the unbalanced signal transmission line has a signal input/output end and an open end, the substrate is a semiconductor substrate in which an IC is fabricated, and the ground ends of the first and second balanced signal transmission lines are connected to the first GND layer.