FMCW Radar Modules From China for ADAS Sensing
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FMCW (frequency-modulated continuous wave) radar is the sensing method behind 76-81 GHz ADAS modules sourced from China, where the radar chirps a swept signal and reads range and velocity from the beat frequency. Most Chinese OEM modules build around a TI AWR1642/AWR1843 or NXP TEF810x front end, and at this band PCB substrate matters — designs move to Rogers RO3003 or similar low-loss laminate rather than standard FR4. Expect AEC-Q100 part qualification claims that you should verify against the actual chipset datasheet.
When you source an FMCW radar module, the chirp parameters (bandwidth, ramp slope) set your range resolution, so confirm them against your detection spec rather than trusting a generic data sheet. A common pitfall is a module that hits range but fails FCC/ETSI spectral mask because the OEM tuned for performance, not compliance.
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FAQ
What chipsets do Chinese FMCW radar modules use?
Most use TI's AWR1642/AWR1843 or NXP's TEF810x front ends. Verify the actual part marking on a sample, since some low-cost modules substitute lesser-known domestic radar SoCs that lack the same documentation.
Does FMCW radar at 77GHz need special PCB material?
Yes. At 76-81 GHz, standard FR4 loss is too high, so the RF section uses low-loss laminate like Rogers RO3003. Ask whether the whole board or just the RF region uses the high-frequency material, as it affects cost and performance.
What compliance applies to a 77GHz FMCW module?
FCC Part 95/15 in the US and ETSI EN 301 091 in the EU govern the 76-81 GHz automotive radar band. The module must meet the spectral emission mask, which is where many fast-tuned designs fail.
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