Design and Experimental Analysis of the Shielding Device for Radio Telescope Rotating Feed-switching Structures

Large radio telescopes have extremely high sensitivity, necessitating stringent electromagnetic compatibility (EMC) design requirements for electronic equipment near the focal point. The shielding and protection scheme for the feed-switching structure in the telescope receiver cabin poses significant challenges. To address these issues, we integrated protective structural design with shielding gaskets, devising a shielding device specifically tailored for the rotating feed structure. On this basis, to validate the shielding effectiveness and reliability of the rotating feed-switching shielding device, we developed an experimental platform for testing the device. Shielding effectiveness was measured under both static and operational conditions, and the results largely met the design expectations. Furthermore, based on the installation and operational characteristics of the shielding device, and considering the service life of the shielding gaskets, we analyzed the key factors affecting the performance and reliability of the device using empirical data. From this analysis, we proposed installation requirements for the shielding device and selection criteria for the gaskets. These findings provide technical support for the shielding scheme design of the telescope receiver cabin.