Patent ID: 7319197

Claim:
A stacked via structure ( 200 ) forming a transmission signal line in an electronic device carrier comprising: a first conductive track ( 205 a ) belonging to a first conductive layer ( 110 a ) connected to a second conductive track ( 205 c ) belonging to a second conductive layer ( 110 c ), said first and second conductive layers being separated by at least one third conductive layer ( 110 b ), a dielectric layer ( 120 ) being disposed between each of said conductive layers; a third conductive track ( 205 b ) belonging to said at least one third conductive layer, said third conductive track being aligned with at least one part of said first and second conductive tracks according to an axis perpendicular to said conductive layers; a first set of vias ( 210 ) comprising at least two vias disposed between said first conductive track and said third conductive track; a second set of vias ( 215 ) comprising at least two vias disposed between said second conductive track and said third conductive track; wherein: said third conductive track is connected to said first and second conductive tracks by means of said first and second set of vias, said vias of said first set of vias being unaligned with respect to said vias of said second set of vias: said first, second and third conductive tracks and said first and second set of vias form a transmission signal line between said first, second and third conductive layers; the shape of at least one of said conductive tracks is an annular ring: and said vias of said first or second set of vias are equidistant to the center of said third conductive track and said aligned parts of said first and second conductive tracks.