SMA coaxial connector is a small threaded coaxial connector suitable for electronic devices with limited space. The standard characteristic impedance is 50 Ω, ensuring the accuracy of signal transmission. It is suitable for broadband applications from direct current (DC) to 26.5GHz (in some cases 18GHz), and has the characteristics of wide bandwidth, excellent performance, high reliability, and long service life. At a frequency of 6GHz, the insertion loss is less than 0.15 decibels, and the voltage standing wave ratio (VSWR) is also kept at a low level. SMA coaxial connectors are widely used in telecommunications, networks, wireless communication, detection and measurement instruments, microwave communication, and measurement