多层电路板的深层充电研究
摘要
Based on the ESA's FLUMIC2, which is an electron spectrum model for high earth orbits, we use the Monte Carlo method and the radiation-induced conductivity (RIC) model to simulate the internal charging process of the multilayer FR4 printed circuit board (PCB) which is shielded by 2 mm aluminum and on the geosynchronous orbit (GEO). The simulation calculates the electric field deep in the PCB. The field is decreased by 54% of the four-layer PCB with the conducted layers grounded comparison to the two-layer grounded PCB. It shows that the multilayer PCB can mitigate the risk of the charging-discharging effect. The constant of the charging time does not depend on layers of PCB but depends on the properties of the dielectric. The electric currents of the grounding layers are about 90~150 pA m<sup>-2</sup> for two-layer PCB, while are 10~100 pA m<sup>-2</sup> for four-layer PCB. It depends on the electron flux and the properties and thickness of the dielectric layer.