Analysis of Common-Mode Coupling Between Cables on Composite Aircraft Panels

The replacement of metallic fuselage panels with conductive composite materials affects electromagnetic compatibility (EMC) due to differences in electrical conductivity and joint connections. This study examines common-mode coupling between cables placed on metallic and conductive composite material ground planes using different measurement setups. Results indicate similar coupling above 1 MHz, while below this frequency, composite panels exhibit higher coupling due to poor electrical contact at junctions. A modified setup confirms that increased coupling is primarily caused by joint connections with poor conductivity in addition to intrinsic composite material properties. These findings provide insights for grounding techniques in modern aircraft and for defining measurement setups.