Millimeter-wave radar sensors are not a specific brand but a category of advanced sensing technology used across industries. Major manufacturers include Texas Instruments (USA), Infineon Technologies (Germany), and STMicroelectronics (Switzerland). These high-frequency (24-100GHz) sensors enable precise object detection, velocity measurement, and material analysis. Key applications span automotive (adaptive cruise control), industrial (level monitoring), security (intrusion detection), and healthcare (vital signs monitoring). Leading products like TI's IWR series and Infineon's BGT60LTR11AIP offer compact, low-power solutions with mmWave accuracy. The technology is increasingly adopted in smart factories and IoT systems for non-contact sensing capabilities.