SMA connector
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Image:SMA connector.jpg SMA (SubMiniature version A) connectors are coaxial RF connectors developed in the 1960's as a minimal connector interface for coaxial cable with a screw type coupling mechanism. The connector has a 50 Ω impedance. It offers excellent electrical performance from DC to 18 GHz. The SMA connector is frequently used in mass numbers in particle accelerators. The connector is used in conjunction with Heliax cable as a connector for X and Y in Particle beam diagnostics, after Quadrupole magnets. The AC feedback signal, X and Y are fed through four SMA connectors from the beam position monitor to the beam monitor instrumentation.
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Variations
SMB connector
SMB (SubMiniature version B) connectors are coaxial RF connectors developed in the 1960s. This version is smaller than SMA connectors.
They feature a snap-on coupling and are available either in 50 Ω or 75 Ω impedances. They offer excellent electrical performance from DC to 4 GHz.
They are available for two SMB cable sizes:
- Cable 2.6/50+75 S (3 mm outer / 1.7 mm inner diameter) and
- Cable 2/50 S (2.2 mm outer / 1 mm inner diameter)
SMC connector
SMC (SubMiniature version C) connectors are coaxial RF connectors developed in the 1960s. They use a 10-32 threaded interface (screw type) and are available in 50 Ω or 75 Ω impedances. They offer excellent electrical performance from DC to 10 GHz.
Reverse polarity SMA
Reverse polarity SMA (RP-SMA or RSMA) is proprietary variation of the SMA connector. Used widely by WiFi device manufacturers such as Linksys, Netgear, and D-Link, it is designed to be incompatible with standard SMA connectors to comply with U.S. FCC regulations which seek to prevent consumers from attaching non-standard aerials to wireless devices.
The male RP-SMA connector has the same external housing as a standard male SMA connector; however, the internal prong is replaced by a receptacle. The female RP-SMA connector has the same housing as a standard female SMA connector however the prong found on a male SMA connector is on the female RP-SMA connector.
References
- Radio-frequency connectors. Part 15: R.F. coaxial connectors with inner diameter of outer conductor 4.13 mm (0.163 in) with screw coupling — Characteristic impedance 50 ohms (Type SMA). International Standard IEC 60169-15, 1979.
- Connectors, plug, electrical, radio frequency. Military specification sheet MIL-C-39012.