During the advanced R&D and testing phase of an automotive radar module, the engineering team encountered severe signal integrity issues: high-frequency noise infiltrated the system through the power supply lines, causing crosstalk with the radar transmission signals. This led to a significant degradation in the radar echo signal-to-noise ratio (SNR), blurred target contours, and substantially impaired accuracy in obstacle detection and tracking.

To address this challenge, the team conducted systematic noise source localization and spectrum analysis, confirming that the interference primarily consisted of common-mode and high-frequency harmonic noise on the power supply path. After multiple rounds of solution screening and simulation validation, the team ultimately selected a tubular feedthrough capacitor with excellent high-frequency suppression characteristics and integrated it at the power input of the radar module.

The capacitor features a fully enclosed metal housing and low-inductance design, providing high insertion loss across a broad frequency range. Actual test data demonstrated that after installation, the system achieved noise suppression exceeding 45dB in key frequency bands (e.g., near 24GHz and 77GHz radar operating frequencies). The SNR of the radar echoes improved from less than 20dB to over 35dB, and the positional error in target detection was reduced from ±10% to within ±3%.

This enhancement not only stabilized and clarified the radar echo signals but also significantly improved the radar’s anti-interference capability and detection consistency in complex electromagnetic environments. The solution successfully passed environmental reliability testing and full-vehicle electromagnetic compatibility validation, becoming a critical design element in the mass production of the radar module. It also provided valuable practical insights for future power supply filtering designs in highly integrated automotive sensing systems.