A Low-loss CPW-DWG-CPW Transition

In this paper, by analyzing the dispersion characteristics of the dielectric waveguide (DWG) and the return loss of the transition with different lengths, a back-to-back coplanar waveguide (CPW)-DWG-CPW transition is proposed. In the transition part, a DWG with a wedge-shaped structure is placed on the center of the CPW transmission line without gap. In order to bind electromagnetic waves in waveguides, the DWG uses dielectric material with high dielectric constant. The back-to-back CPW-DWG-CPW transition is designed based on PCB process.The transition and DWG designed in this paper work at 125 GHz–155 GHz and the minimum insertion loss is 1. 7dB at 152 GHz.