Patent ID: 8324508

Claim:
A composite circuit board, comprising: a first circuit board comprising a first dielectric substrate, a first conductive line which comprises a first internal-layer conductive line inside the first dielectric substrate and first through conductor located from an end of the first internal-layer conductive line to a first main surface of the first dielectric substrate, and a second conductive line which comprises a second internal-layer conductive line inside the first dielectric substrate so as to align partly with the first internal-layer conductive line and a second through conductor located from an end of the second internal-layer conductive line to the first main surface; and a second circuit board comprising a second dielectric substrate, a third conductive line which is electrically connected to the first conductive line, and a fourth conductive line which is electrically connected to the second conductive line and is shorter than the third conductive line, wherein the second internal-layer conductive line is longer than the first internal-layer conductive line, the second conductive line is longer than the first conductive line, and the third conductive line and the fourth conductive line are located on a same main surface of the second dielectric substrate.