How can the shielding effectiveness of the concentrator housing be guaranteed?

The shielding effectiveness (SE) of the concentrator's metal casing directly affects its radiated emissions and radiated immunity performance. Ensuring SE requires attention to materials, structure, and continuity. Material selection: The main body of the casing should use highly conductive materials, such as galvanized steel sheet (SE>60dB at 1GHz). Structural design: Minimize openings and gaps; necessary ventilation holes should use honeycomb metal ventilation panels (hole diameter <λ/10). Electromagnetic sealing gaskets (such as conductive foam or metal springs) should be used at the joints between the panel and the enclosure. Multi-point latches and conductive gaskets should be used between the door and the enclosure. All cable interfaces must use connectors with filtering capabilities or metal through-core capacitors, ensuring 360° connection. The internal mounting plate should be reliably connected to the casing via conductive posts. Through design, the concentrator casing should achieve a shielding effectiveness greater than 40dB in the 30MHz-1GHz frequency band.