CASE STUDY
EMI SHIELDED AIR VENT AND EMI GASKET REQUIRED FOR MILITARY GROUND RADAR CABINET
Parker Chomerics helped to design a custom EMI shielded air vent panel, including an electrically conductive elastomer gasket, for a military ground radar cabinet.
CUSTOMER CHALLENGE
A manufacturer of mobile military ground radar systems required an air vent that would provide both high air flow and EMI shielding for an electronics enclosure cabinet on a ground vehicle. EMI air ventilation panels combine maximum shielding with minimal air flow resistance, to provide optimal airflow for cooling electronic enclosures.
These vents can be incorporated into enclosures where EMI radiation and susceptibility is a concern or where heat dissipation is necessary. This ensures long-term assembly performance.
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DESIGN REQUIREMENTS
- Paint must be camouflaged per MIL-DTL-64159
- Airflow, EMI shielding, and tempest weather sealing
- Highly custom gasket configurations required
KEY CUSTOMER REQUIREMENTS
- High air flow
- Excellent EMI shielding
- Color matching to customer chassis
- High temp., humidity, and salt/corrosion
- Environmental and weather sealing
SOLUTION
Parker Chomerics designed a custom air vent featuring a tin/e. nickel plated, single layer 1/8 in. (3.18 mm) cell aluminum honeycomb. The single layer allowed for maximum airflow, with the plating providing high EMI shielding performance.
A CHO-SEAL® Co-Extruded EMI gasket was fitted into a groove in the vent frame. This gasket features a single, homogenous strip with one half being conductive and the other half providing weather sealing. Testing was performed and the assembly exceeded customer’s shielding and sealing requirements.
This prevents corrosion of the mating flange in marine or airborne environments. Co-Extruded gaskets are also cost effective, as they permit the use of existing flange designs and provide for gasket attachment via a less expensive non-conductive elastomer. A similar two-gasket shielding system requires a costly double groove flange design.
CONCLUSION
Parker Chomerics designed a custom vent with additional EMI shielding and weather sealing gaskets for a mobile ground radar unit. Our in-house test services engineers put this design through a variety of performance tests including, temperature, humidity, salt fog/corrosion, and shielding.
The vent assembly passed both shielding tests, as well as the customer’s visual inspections of what occurred during tests such as humidity and salt fog/corrosion. Overall, this was a successful qualification procedure.
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Parker Hannifin Chomerics Division
77 Dragon Ct., Woburn, MA 01801
781-935-4850