Design of Planar Waveguide Transition and Antenna Array utilizing Low-Loss Substrate for 79 GHz Radar Applications

This paper demonstrates planar designs of a microstrip-to-waveguide transition as well as a 4x1 patch antenna array at 79 GHz to investigate utilizing a new low-loss substrate material in radar applications. The planar transition enables direct surface-mounting of the standard waveguide flange without additional mechanical parts. It comprises of microstrip-to-substrate integrated waveguide (SIW) transition and SIW-WR12 transition. The patch antenna array is employed in a two-channel radar sensor where its radiation pattern is measured and verified.