Coaxial RF Connectors: SMA, MMCX, U.FL Sourcing
1 resources tagged with "Coax"
Coaxial RF connectors from China cover SMA/RP-SMA, MMCX, U.FL/IPEX, BNC, and N-type — small parts where VSWR, gold plating, and frequency rating decide whether your antenna actually radiates. The single most common failure is polarity: SMA vs RP-SMA reverses the pin/socket, so an RP-SMA antenna won't mate with an SMA jack even though both say "SMA." The reference here covers VSWR limits, plating requirements, and the polarity mistakes that cost a production run.
When you source RF connectors, specify VSWR (e.g. better than 1.2:1 at your band), gold plating on the center contact, and the exact polarity variant. The classic pitfall is ordering by name alone and discovering SMA/RP-SMA mismatch after the boards are assembled.
Wiki (1)
FAQ
What's the difference between SMA and RP-SMA?
RP-SMA (reverse polarity) swaps the center pin and socket relative to standard SMA. They won't mate with each other, so confirm which polarity your board and antenna use before ordering.
Why does gold plating matter on RF connectors?
Gold resists corrosion and keeps contact resistance low and stable, which preserves signal integrity. Thinly plated or tin contacts degrade VSWR over time, especially in humid environments.
Related Topics
Have a sourcing project in mind?
Tell us what you need. We respond within 24 hours, including weekends.