Transitions in Multilayer PCB Technology for mmWave Low Loss Transmission Lines

This paper presents a transition from coplanar waveguide to stripline capable of operating over the DC–67 GHz frequency range. The proposed structure is a vertical throughvia transition, fabricated using PCB technology and designed for on-wafer probe measurements. Full-wave electromagnetic simulations have been performed to evaluate the S-parameters of both the single transition and a back-to-back configuration including a 30mm stripline section. In the back-to-back configuration, the measured insertion loss is less than 2.2dB, while the return loss exceeds 20dB across the entire frequency band of interest.