The coaxial SMA (Subminiature A) connector is a microwave connector developed by Bendix Scintilla Corp. and is used in RF and microwave
applications because of its robustness. SMA connectors have threaded closures and therefore high RF tightness, but the reflection
coefficientis higher than other RF connectors. The SMA connector comes in two versions: standard and reverse. In the standard version, the plug
has a union nut with an internal thread and a pin, the SMA socket forms the counterpart with the external thread and the calyx. In the reverse version, the reverse plug has a calyx and the reverse socket has a pin.GHz. High-quality ones can be used with most high-frequency cables up to 18 GHz, and specially designed versions are suitable for frequencies up to 24 GHz and even for cut-off frequencies up to 34 GHz, but with reduced values for VSWR and return loss. The latter is above 40 dB for the standard version in the frequency range
up to 8 GHz and above 30 dB up to 18 GHz.
without significant degradation of transmission characteristics.There are so-called precision SMA connectors that are mechanically compatible
with SMA connectors; these connectors are known as 2.92-mm
connectors, and WSMA