How can the heat dissipation structure of a concentrator also provide shielding?

The concentrator's heat dissipation requirements conflict with shielding requirements, necessitating a clever balance in the design. For ventilation holes, honeycomb metal ventilation plates should be used, with the cutoff frequency of the hexagonal holes designed to be higher than the highest frequency requiring shielding (e.g., 1GHz), typically with a hole diameter <λ/10. If the heatsink is installed externally to the chassis, it should be insulated from the chassis (e.g., through mica gaskets). However, its mounting screws may create leakage paths; this can be addressed by adding feedthrough capacitors to the screws or using non-metallic screws. If the heatsink is internal to the chassis, no special shielding treatment is required. For cases where large openings must be made for fan installation, a metal mesh cover can be added to the outside of the fan, electrically connected to the chassis. All heat dissipation structures that also provide shielding must maintain good electrical connection between their metal parts and the chassis body. A well-designed system can minimize the impact of the heat dissipation structure on the overall shielding effectiveness to less than 3dB.