Design of a Shielding Box for Interference of Switching Power Supply at L-Band

The radio telescope has extremely high sensitivity, and the potential electromagnetic interference can enter the antenna system through the antenna sidelobe, reduce the signal-to-noise ratio and deteriorate the observation data. The purpose of electromagnetic shielding is to obtain good signal-to-noise ratio and reduce the complexity of processing observation data. For the electromagnetic interference caused by the switching power supply of the LED lamp in the radio astronomy station, based on the principle of electromagnetic shielding and the measurement method of shielding effectiveness of the 3 meter radio wave darkroom, combined with the actual shielding requirements, the mechanical structure of the shielding box is designed by using standard shielding materials and filter devices in this paper. This paper proposes a box mechanism which can shield interference form switching power supply at L-band, which can provide reference for the practical application and production of electromagnetic shielding protection equipment in the future.