SMA (SubMiniature version A) connectors are semi-precision coaxial RF connector with a screw-type coupling mechanism.
The connector has a 50Ω impedance. SMA is designed for use from DC (0 Hz) to 18 GHz, and is most commonly used in microwave systems, hand-held radio and mobile telephone antennas, and more recently with WiFi antenna systems and USB software-defined radio dongles. It is also commonly used in radio astronomy, particularly at higher frequencies (5 GHz+).
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