Shielding Design to Reduce Near-Field Emissions of USB Type-C Interface

This paper analyzes electromagnetic radiation in the 2.4 GHz band generated during high-speed data transmission via USB Type-C connectors and proposes a shielding solution to mitigate near-field emissions. Motivated by the EU's common-charger policy and the rapid adoption of USB-C, which heighten EMI risks for Bluetooth and other services in this band. We quantitatively measured both near-field and far-field radiation under active data-link conditions. Near-field scans revealed spurious emissions around 2.4 GHz at levels that may exceed regulatory criteria or cause wireless interference. Guided by these measurements, we modeled and designed an effective shielding structure using electromagnetic simulation software Ansys HFSS Simulation results indicate a substantial reduction of radiation in the problematic band, suggesting a practical near-field shielding approach for USB Type-C data-transmission modes.