Autonomous vehicles and advanced driver assistance systems (ADAS) technologies have promoted the rapid development of automotive millimeter-wave radar sensors and the iterative updates of technologies, making car driving and travel safer. Millimeter-wave radar has become an indispensable sensor in automotive autonomous driving and ADAS systems due to its advantages of high resolution, strong anti-interference performance, good detection performance, and small size. With the increasing design of domestic millimeter-wave radar and the installation rate of domestic models, the application of millimeter-wave radar has also been expanded to more aspects. This article will briefly explain some application scenarios and design trends of millimeter-wave radar; and discuss the selection of key PCB materials in the design of millimeter-wave radar antennas, and the key characteristics of PCB materials.
With the development of technology, the evolution of millimeter-wave radar also follows the direction of meeting the needs of users, realizing the detection range from near to far, and the measurement accuracy is gradually improved. From the earliest speed measurement and distance measurement, to the realization of speed measurement, distance measurement, angle measurement, and now to achieve higher resolution image imaging. In the ADAS system, the application of millimeter-wave radar can be divided according to the needs and functions of the vehicle. For example, it can be divided into forward radar, backward radar and angle radar according to the different installation positions on the car; it can also be divided according to the detection distance. The distance is divided into long-range radar, medium-range radar and short-range radar. The application of millimeter wave radar in ADAS includes such as AEB automatic braking, FCW forward collision warning, LCA lane change assist, ACC adaptive cruise, BSW blind spot monitoring and so on.