How can EPS ventilation openings balance heat dissipation and shielding?

The ventilation openings of EPS cabinets are the main channels for electromagnetic leakage, and both heat dissipation requirements and shielding effectiveness must be considered. The solution is to install electromagnetically shielded ventilation windows. These windows are typically composed of multiple layers of staggered metal waveguides or metal honeycomb cores. The principle is that the aperture size of the waveguide or honeycomb structure is designed to exhibit high attenuation characteristics for electromagnetic waves above the cutoff frequency, effectively blocking their passage while allowing free airflow.

Selection and installation points:

1. Determine the waveguide aperture size or honeycomb core density based on the highest frequency to be shielded.

2. Ensure a low-impedance continuous conductive connection between the metal frame of the shielding window and the cabinet panel, typically using conductive gaskets and securing them with screws around the perimeter.

3. Clean regularly to prevent dust blockage that affects ventilation efficiency.

Additionally, direct leakage can be further reduced by optimizing the airflow, placing ventilation openings in low-field areas on the sides or bottom of the cabinet, and using bent airflow channels.