SMA connector

SMA connector
	Figure 1. Standard male SMA connector: male body (inside threads) with male inner pin
Type	RF coaxial connector
General specifications
Diameter	Male: 0.312 in (7.9 mm) HEX
Cable	Coaxial
Passband	Typically 0–18 GHz, ; some up to 26.5 GHz

SMA (SubMiniature version A) connectors are semi-precision 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. SMA was originally designed for use from DC (0 Hz) to 12 GHz, however this has been extended over time and variants are available to 18 GHz and 26.5 GHz. There are also mechanically compatible connectors such as the K-connector which operate up to 40 GHz. The SMA connector 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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