Circuit device with signal line transition element

A circuit device, comprising:

• a multilayer circuit carrier comprising a plurality of layers including a first layer and a second layer;
• a first signal transmission line, disposed on a surface of the first layer;
• a second signal transmission line, disposed on a surface of the second layer;
• a signal line transition element, passing through at least the first layer and the second layer, the signal line transition element having a first signal terminal formed on the surface of the first layer and a second signal terminal formed on the surface of the second layer;
• a first impedance transformer, disposed on the surface of the first layer and electrically connected between the first signal transmission line and the first signal terminal, for providing impedance matching between the first signal transmission line and the signal line transition element;
• and
• a second impedance transformer, disposed on the surface of the second layer and electrically connected between the second signal transmission line and the second signal terminal, for providing impedance matching between the second signal transmission line and the signal line transition element.