A fully micromachined W-band waveguide-to-grounded coplanar waveguide transition for 91–113 GHz applications

This paper presents a novel coplanar waveguide (CPW) to a fundamental rectangular waveguide transition for W-band applications. The designed waveguide-to-CPW transition is optimized to achieve low loss by using two software packages, CST Microwave Studio and the EM field solver of HFSS. The maximum insertion loss of the waveguide-to-CPW back-to-back transition is -1.8 dB in a frequency range of 91.2 - 113.2 GHz, corresponding to a 22% bandwidth. In addition to this wide bandwidth, the structure benefits from a simple structure.