RF connectors I Connector
SMA connectors are semi-precision coaxial RF connectors
as a minimal connector interface for coaxial cable with a
screw-type coupling mechanism.
The connector has a 50 Ω impedance.
SMA is designed for use from DC (0 Hz) to 18 GHz,
but is most commonly used for 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 (5GHz+).