Structure design and Simulation of a high performance double-layer shielding box

Aiming at the electromagnetic shielding problem of electronic equipment in the radio observatory site, based on the electromagnetic shielding principle and the shielding effectiveness test method, the paper proposes a structural design scheme of double-layer electromagnetic shielding box meeting the astronomical observation requirements. In this paper, a double-layer shielding structure model is established and tested by CST full wave simulation software. The model takes the plane wave as the excitation source and places probes in the cavity. The simulation results show that the shielding efficiency in L-band can reach 120 dB, which confirms the effectiveness of the structure model and provides a reference for the practical application of electromagnetic shielding protection equipment in the future radio observatory site.