This thesis investigates how environmental contaminants affect the performance of millimeter-wave radar, focusing on the AWR1843BOOST sensor. To evaluate how dirt water, salt water, and water attenuate radar signals, controlled laboratory studies were carried out. By comparing the reflections from a reference target on a test surface with and without impurities, the strength of the radar signal was determined. The findings demonstrate the substantial effects of each form of contamination on radar transmissivity. The water decreased signal strength with a 0.11mm layer from -47.5533 dB to -51.7395 dB with a 0.66 mm layer. Saltwater decreased signal strength with a 0.11 mm layer from -48.6587 dB to -50.7752 dB with a 0.66 mm layer. Dirt water decreased signal strength with a 0.11 mm layer from -48.8468 dB to -51.2691 dB with a 0.66 mm layer. These results highlight how important it is to study the reduction in the signal power of radar systems in various environmental conditions.