Novel Broadband Transition for Rectangular Dielectric Waveguide to Planar Circuit Board at D Band

This paper demonstrates a D-band transition between a coplanar waveguide line and a rectangular dielectric waveguide> The transition uses an intermediate metallic waveguide partially implemented on printed circuit board (PCB) to enhance the coupling efficiency and to offer a solid assembly base. The transition was designed to convert the CPW mode to the $\pmb{E_{11}^{y}}$ mode in a dielectric rectangular waveguide. In this paper we present the design, fabrication and measurement data, showing a 7 dB measured insertion loss for a back-to-back transition connected by a 80 mm long section of polystyrene, measured with GSG on-wafer probes.