Patent ID: 7868257

Claim:
A via transmission line for a multilayer PCB comprising: one or more signal vias acting as inner conductive boundary of the via transmission line; an assembly of ground vias and a set of ground plates from conductor layers of the PCB where the ground vias are connected to the ground plates, and the assembly of the ground vias and the set of ground plates act as the outer conductive boundary of the via transmission line; and a PCB isolating material disposed between the inner and outer conductive boundaries of the via transmission line, the PCB isolating material having a cylindrical clearance hole separating the one or more signal vias and conductive parts of the outer conductive boundary of the via transmission line, wherein the cylindrical clearance hole establishes a broadband operation by means of its cross-sectional shape and dimensions which are determined, wherein a contour of the outer cross-sectional shape of the clearance hole corresponds to an arrangement of ground vias in the outer conductive boundary and dimensions of the clearance hole extend directly to an outer conductive surface of a ground via rod keeping the full value connections of ground vias and ground plates.