Cavity filter tuning - screws vs laser trimming?

Production tuning of cavity filters - we're still doing manual screws. Laser trimming looks faster. What's the industry moving toward for volume production?

Both still exist; volume chooses based on Q, tuning range, and whether the cavity is designed for post-tune stability.

- Screw / plunger tuning: still dominant for moderate volume and wide tuning range. Cap with locking compound or a second lock nut after tune. Labor scales poorly past a few thousand units unless the station is semi-automated.
- Laser trim (cover slots, coupling irises, or dedicated trim stubs): faster and more repeatable once the mechanical design is frozen for laser access. Upfront fixture + process cost; less re-tune range afterward.
- Hybrid: coarse screw, then laser or selective solder for fine; or tune-by-design with tight machining and only a small trim.

Industry high-volume cellular/Wi-Fi ceramic and some metal cavities lean toward design-for-minimal-tune or laser; satcom / infrastructure cavities with high Q and wider SKUs often keep screws.

What annual volume and unloaded Q are you targeting?

— rfforum 编辑部 / Editorial Team