Broadband conductor-backed coplanar waveguide to double-sided parallel strip line transition at millimeter wave

This paper introduces a broadband conductor-backed coplanar waveguide (CBCPW) to double-sided parallel strip line (DSPSL) transition structure. The performance is demonstrated in a back-to-back (B2B) configuration on 0.127 mm thick FR408 with relative permittivity of 3.75 and loss tangent of 0.018. AWR AXIEM and ANSYS HFSS simulations have been used to optimize all the structures. Simulation and measurement results indicate the transition structure has a 10 dB bandwidth from 24 to 105 GHz. A single dipole and 12 - element array operating at 73 GHz are realized with this transition. The simulation and measurement results are in good agreement and demonstrate the application potential of this transition due to its simple structure and low cost features.