Broadband effect of linear tapered transitions between probe pads and GCPW signal lines on-chip

To effect a low-reflection interconnect between GSG probe pads and on-chip GCPW, a linear taper between the signal pad and the GCPW signal line is often included. This work evaluates, both in parametric simulation and experimentation, the effect of this taper shape to the input reflection in the band 1 – 110 GHz. It is found that, although longer tapers offer some advantage below 30 GHz, the taper ultimately impedes the input reflection of the interconnect.