Coaxial cable connector with semi-precision minimal connector interface developed in the 1960s
For the optical fiber connector, see Optical fiber 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.[1] 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.[2] There are also mechanically compatible connectors such as the K-connector which operate up to 40 GHz.[3] 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.[4] It is also commonly used in radio astronomy, particularly at higher frequencies (5 GHz+).
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