Protecting the Flight Controller Board of UAV against Conducted UWB Pulses

For the first time, modal filters based on strip and cable structures are simulated to protect a flight controller board of an unmanned aerial vehicle from ultra-wideband (UWB) pulses excitations. The propagation paths of conducted ultrawideband pulses in the flight controller are determined. The interfaces for connecting the ports of the board are detailed. Optimization of geometrical parameters of the modal filters cross-section is performed by a heuristic search method according to amplitude (to minimize the maximum value of voltage at the modal filters output) and time (to equalize time intervals between decomposition pulses and maximize the total duration of decomposition pulses) criteria. To verify the results of quasi-static simulation, an electrodynamic analysis was performed. As a result, the attenuation of the excited UWB interference with 500 V EMF is obtained from 61 times to 154 times, depending on the path of its propagation. The obtained results demonstrate high efficiency of the considered modal filters, opening perspectives of their practical application.