SMA stands for SubMiniature version A, and is designed for use with standard flexible coaxial cables, industry standard semi rigid and conformable cables. They are 50 ohm and can fully mate with other industry standard SMA connectors as well as 2.92 mm and 3.5 mm connectors. SMA connectors are excellent general purpose connectors. The diameter is ¼” with 36 threads per inch on the threaded barrel. SMA connectors are lightweight, compact and vibration proof making them perfect for many applications, and are rated for a minimum of 500 mating cycles. SMAs are highly durable with a low VSWR (Voltage Standing Wave Ratio). VSWR is an indicator of signal reflected back to the RF transmitter; the lower the VSWR, the better. The SMA connector is one of Amphenol RF’s most popular connectors, performing with excellent electrical characteristics up to 26.5 GHz.