Research on Shielding Effectiveness of Spacecraft Shielding Box to Electromagnetic Pulse

When the spacecraft is flying at high altitude, the electromagnetic pulses generated by lightning always pose a serious threat to important circuit equipment inside the spacecraft. The shielding box technology in electromagnetic compatibility(EMC) theory is one of the most important methods of electromagnetic protection. To this end, the shielding box model of the spacecraft was simulated by the CST simulation software, and the shielding effectiveness(SE) of the shielding box was studied and analyzed by placing the model under the environment of electromagnetic pulse irradiation. This paper demonstrates the equivalent relationship between the spacecraft shielding box and the rectangular cavity(RC). Based on the experimental results, a method of "MOVING" frequency points with low SE is proposed, which provides optimization suggestions for the design of actual engineering shielding box.