Evaluation of Influences of Titanium Dioxide on Radar Sensors Operating at 77 GHz

For future driver assistance functions and autonomous driving, radar represents an indispensable technology. Since the functional load on radar sensors is still increasing, the number of radar sensors per vehicle is also increasing. Therefore, from a design perspective, a hidden integration behind painted plastic bumpers is favorable. However, depending on the contents of the coating, the radar performance is decreasing. Especially Titanium Dioxide (TiO2), which is one of the most used pigments in automotive coatings shows an impact on radar depending on its concentration. In this contribution, effects of different TiO2concentrations on radar sensors operating at 77 GHz are investigated. The Influence is evaluated by determining the relative permittivity and the deviation when estimating angles.