Traveling Wave Tube (TWT) RF Interaction Structure from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
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