Traveling Wave Tube (TWT) RF Interaction Structure from Canada
RF interaction structure (helix assembly) for traveling wave tubes used in satellite communications and high-frequency amplifiers. Falls under HTS 8540.99.4000 as specified for microwave tubes in 8540.71-8540.79. Enables electron beam interaction for RF signal amplification.
Duty Rate — Canada → United States
10%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Provide frequency range and power specs in import docs to confirm microwave tube compatibility
• ITAR/EAR export controls often apply; ensure proper licensing and end-user statements
• Test for vacuum integrity if applicable, as customs may inspect for contamination risks