This paper presents a Rogowski coil-based method for high-frequency common-mode (CM) current measurement in electric aircraft drive systems. The proposed system uses one Rogowski coil per phase with a summing circuit to extract only the CM component without reducing effective turns. This approach simultaneously expands the measurement bandwidth and improves sensitivity. Experimental validation demonstrates that the proposed configuration nearly doubles the measurable bandwidth (exceeding 120 MHz) and enhances the current gain by 7.5 dB compared with conventional single-coil methods. The technique provides a reliable solution for EMI/EMC evaluation in high-current, high-frequency environments of next-generation electric aircraft propulsion systems.
