Patent ID: 7394027

Claim:
A high frequency multi-layer printed circuit board, comprising: a layer stack comprising a first metal-comprising layer, a second metal-comprising layer, a first outer metal-comprising layer, a second outer metal-comprising layer, and a plurality of dielectric layers including at least a first dielectric layer separating said first and second metal-comprising layers, at least a second dielectric layer separating said first metal-comprising layer and said first outer metal-comprising layer, and at least a third dielectric layer separating said second metal-comprising layer and said second outer metal-comprising layer; and a transition structure comprising: a through connection extending from said first metal-comprising layer through said first dielectric layer to said second metal-comprising layer; an impedance adapting structure surrounding said through connection at least partially and providing a characteristic impedance of said transition structure, said characteristic impedance being adapted to a desired impedance value; and an outer via connecting said through connection to a structure disposed on said first outer metal-comprising layer.