Planar Waveguide Vent

Planar Waveguide Vent for Avionics Cabinets with Tight Space and EMI Constraints

Avionics cabinets are small. Electronics sit close. Power modules, controllers, communication boards. Heat is generated fast. Airflow is needed. Openings risk EMI leakage.

Perforated panels or louvers are common. Air passes, metal surface breaks. High-frequency EMI leaks through openings. Sensitive circuits affected. Nearby systems affected. Mesh filters or extra shields take space, add weight. Performance varies with vibration and temperature. Fixes late in design are costly.

A Planar Waveguide Vent is used. Air flows through channels. EMI is blocked along the same path. Shielding is maintained by geometry. No extra material needed. Space stays minimal. Fits avionics constraints.

Vents placed near heat sources. Intake and exhaust panels. Areas without ducting. Airflow predictable. Heat removed. EMI reduced. Vents allow thermal effectiveness without shielding gaps.

Performance depends on channel size, length, wall thickness. Unlike perforations, airflow changes do not affect EMI. For avionics, reliability and repeatability matter. Stable performance under different operating conditions.

Integration is simple. Part of door, side panel, partition wall. Shielding continuity stays. Secondary shields often unnecessary. Early placement handles thermal and EMI together. Fewer development iterations. Testing predictable.

Every opening, metal surface, and airflow path matters. Planar Waveguide Vent makes vent a controlled interface. Air moves where needed. Shielding remains intact. Cabinet stays cool. EMI stable.

For tight-space avionics cabinets, high power density, strict EMC requirements, planar waveguide vents are essential. Combines thermal control and EMI in compact structure. Early design integration avoids later redesign. Keeps thermal and shielding performance within specification.