A recent article in IEEE Spectrum covers the challenge of existing vehicle sensors and introduces a fresh contender: terahertz-band radar from Teradar. Traditional radar struggles to detect small objects; lidar can deliver high resolution but is hindered by weather and moving parts; cameras are vulnerable to glare and lighting.
Teradar’s system addresses these gaps by using arrays of electronically-steerable terahertz transmitters and imaging-chip receivers that create a point-cloud map of the scene, similar to lidar, but without mechanical parts.
The company claims to achieve roughly 20 times the resolution of conventional automotive radar while operating at distances of up to 300 m, and claims weather resilience akin to radar while approaching lidar clarity. The enabling technology builds on recent advances in silicon-transistor circuits capable of higher frequencies, and improvements in packaging and beam-steering. An MIT professor quoted in the article notes that the performance is close but “delivering the range needed for safe self-driving remains pretty challenging.”
Teradar says it is working with five car makers aiming at 2028 production vehicles with this sensor. Beyond automotive use, the article notes that terahertz imaging has applications in security scanning and medical diagnostics, thanks to its ability to see through some materials.
For engineering audiences, what stands out is the convergence of terahertz hardware, beam-steering electronics, and automotive safety requirements. The move toward higher-frequency radar systems signals a shift from mmWave toward full terahertz sensors in vehicles, drones, or robotics. If successful, this may reshape how sensor systems are architected in ADAS and autonomous vehicles, offering a compact, solid-state, high-resolution alternative to lidar/radar stacks.