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for metallic honeycombs and turbine parts
In our work, we often see a situation where the vent panel is chosen too conservatively. The team wants strong EMI shielding, so they pick a panel with very high attenuation. The result is not better performance. It’s a cooling issue.
What overshielding looks like
Airflow drops.
Internal temperature rises.
Fans run at higher speed.
Equipment runs hotter than designed.
Long-term reliability goes down.
So, overshielding is not “too much shielding”. It is shielding that hurts airflow.
Why this happens
Most people select a vent panel based on EMI numbers only. They ignore the fact that vent panels also create pressure drop. A panel that blocks EMI well can still be a bad choice if it blocks air too much.
Another common mistake is using a standard panel for all cabinets. But each cabinet has different airflow demand and different EMI sources. One panel cannot fit all.
How Planar Wave Shielded Ventilation Panels behave
A Planar Wave Shielded Ventilation Panel uses a waveguide cutoff concept. The panel has structured channels. Air passes through, but high-frequency waves cannot.
This works, but it needs proper sizing:
Channel size determines cutoff frequency.
Channel length affects attenuation.
Open area affects airflow.
If you change one parameter, the others change too.
What we do at MAT Aviation Manufacturing Co., Ltd.
We don’t sell “one-size-fits-all” panels. We design based on the actual cabinet and the actual airflow demand.
The process is simple:
Check the cabinet’s airflow requirement
Check the EMI frequency range to block
Confirm installation constraints
Adjust the panel design
Verify airflow and shielding in real conditions
We can customize:
channel size and shape
panel thickness
material and surface treatment
mounting method
gasket and grounding design
The goal is to avoid overshielding while still meeting EMI requirements.
Summary
Overshielding happens when a vent panel is chosen only for EMI performance, without considering airflow. A Planar Wave Shielded Ventilation Panel can solve EMI leakage, but only if the panel is sized and installed correctly.
If the airflow is not considered, you end up with a cabinet that runs hotter, not a better shielded system.