RF Connectors: SMA, MMCX, U.FL/IPEX Sourcing Guide
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RF connectors — SMA, RP-SMA, MMCX, U.FL/IPEX, BNC, N-type — are the interface between a radio board and its antenna, and a wrong choice quietly raises VSWR and kills range. From China these come in huge price and quality spreads; the differentiators are VSWR (under ~1.3:1 for a good SMA), gold-plated center contacts, and the rated frequency range, with U.FL/IPEX usable to about 6GHz but limited to ~30 mating cycles.
When you source RF connectors, the classic trap is SMA versus RP-SMA: the bodies look identical but the pin/socket are swapped, so a whole antenna batch fails to mate. Confirm 50Ω impedance (75Ω for some video), real gold plating thickness, and measured VSWR on samples — datasheet numbers from low-end Chinese vendors are often optimistic.
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FAQ
Why won't my antenna connect even though both say SMA?
One is almost certainly RP-SMA (reverse polarity), which swaps the pin and socket. Standard SMA and RP-SMA do not mate. Match the polarity on both the board connector and the antenna before ordering.
Which RF connector is best for a device with frequent antenna changes?
Avoid U.FL/IPEX, which tolerates only ~30 mating cycles. Use SMA or MMCX for repeated connection, or run a U.FL-to-SMA pigtail so the fragile connector stays mated inside the enclosure.
How do I verify RF connector quality before bulk ordering?
Measure VSWR across the operating band on samples, confirm 50Ω impedance and gold-plating spec, and check mechanical mating. Out-of-spec VSWR and thin plating are the most common defects from cheap suppliers.
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