Development Trend of Radar PCB under Millimeter Wave Radar Technology

Radar PCB refers to the printed circuit board used in radar, which plays a very important role in the performance of radar. Currently, with the development of millimeter wave radar technology, the production of radar PCB has attracted more attention from PCB manufacturers.

Millimeter wave refers to electromagnetic waves with wavelengths ranging from 1-10mm, which have short wavelengths and wide frequency bands, making it easier to achieve narrow beams, high radar resolution, and less susceptible to interference. Millimeter wave radar is a high-precision sensor that measures the relative distance, current velocity, and orientation of the measured object. It was early applied in the military field. With the development and progress of radar technology, millimeter wave radar sensors have been applied in various fields such as automotive electronics, unmanned aerial vehicles, and intelligent transportation. At present, various countries have different frequency bands assigned to onboard millimeter wave radars, but they mainly focus on 24GHz and 77GHz, with a few countries (such as Japan) using the 60GHz frequency band. Due to the many advantages of 77G compared to 24G, the frequency band of global vehicle mounted millimeter wave radars will converge to the 77GHz frequency band (76-81GHz) in the future.

More and more car models on the market are offering 24-GHz millimeter wave short range radar (SRR) systems. The automotive designers and manufacturers are taking a longer-term view and are already considering car radar systems at 77- GHz and 79-GHz. In order to truly promote the transformation of automotive electronic systems, printed circuit board (PCB) materials will be a very important component, and the use of radar systems will greatly enhance the safety performance of automobiles. Compared to 24-GHz automotive radar, the 77 -GHz and 79-GHz systems have shorter wavelengths and can use smaller antenna sizes. Due to the more significant Doppler shift effect in the millimeter wave band compared to 24-GHz, these high-frequency systems will be more accurate in testing the distance and relative velocity between cars and other objects. The high-resolution 77-GHz and 79-GHz radar systems can detect more dangerous road conditions, including icy and snowy roads.

The output of millimeter wave radar will bring huge demand for high-frequency PCBs in automobiles. At present, automotive millimeter wave radars are in rapid development, and in the next two years, they will be in the mass production period. Generally, cars that support ADAS functions will use at least 4 millimeter wave radars, the all-new Audi A4 will use 5 millimeter wave radars, and Mercedes Benz’s S-class cars will use 7 millimeter wave radars. It is expected that the average number of single cars using millimeter wave radars will continue to grow in the future, and the demand for automotive radar PCBs will also rapidly increase.

Millimeter wave radar products are about to enter the release period, requiring high-frequency PCB boards to achieve antenna functions – maintaining sufficient signal strength of the antenna in a small integrated space. The higher specification high-frequency PCB board of 77Ghz radar will bring huge demand for corresponding high-frequency radar PCB boards for large-scale application.

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