Passive Electromagnetic Compatibility Enhancement in Autonomous Vehicles via Conformal Meta-Surfaces

Abstract

This study presents the design, fabrication, and characterization of a flexible meta-absorber for suppressing electromagnetic interference in automotive radar systems operating at 77 GHz. The proposed structure, consisting of a patterned copper layer on a PDMS substrate, achieves over 92% absorption at 77.2 GHz with a bandwidth of 2.8% and maintains efficiency above 90% under bending radii down to 2 cm. Experimental validation demonstrates a 12 dB enhancement in signal-to-noise ratio and 38% reduction in false alarm rate during field tests. The absorber exhibits excellent thermal and humidity stability, offering a practical, low-cost solution for improving radar immunity in complex driving environments.