How to select the right shielding for a concentrator interface?

The selection of shielding components (such as shielded connectors, feedthrough capacitors, and conductive gaskets) used for interfaces on the concentrator chassis directly affects shielding effectiveness. Selection criteria include: frequency range, shielding effectiveness (SE), current capacity, and mounting method. Connectors should be metal-cased models with 360° shielded connections, such as D-Sub and RJ45 with metal shells and spring contacts. Shielding effectiveness should be at least 60dB (at 1GHz). For high-current interfaces such as power supplies, filter connectors with integrated π-type filter circuits can be used. Feedthrough capacitors are used to shield high-frequency signals; their self-resonant frequency must be higher than the interference frequency. Conductive gaskets (such as conductive foam and wire mesh gaskets) are used to fill the gap between the connector and the chassis panel and should be selected based on compressibility, conductivity, and environmental durability. All shielding components must achieve a low-impedance connection with the chassis panel.