SMA Connector
SMA (SubMiniature version A) connectors are coaxial RF connectors developed in the 1960s 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 17 GHz.
Read more about SMA Connector: Connector Design, Variations, Reverse Polarity SMA