The RF coaxial connector was mainly developed because of the big station, that is, the fit in the 1960s. At the beginning, the fit did not change and improve a lot, but because of the need, it had to be upgraded and developed. With the rise of millimeter waves, the increase in frequency of use and the miniaturization of military use are all required to meet appropriate use requirements. Millimeter-wave RF coaxial connectors have received a lot of attention and development. At the beginning of the development of suitable application technology, the driving force is to use active devices that generate and amplify signals and passive devices that transmit signals as adjustments. Passive components that transmit millimeter-wave signals mainly include millimeter-wave transmission lines and their connectors that are considered part of the transmission line, as well as other millimeter-wave components. As a millimeter wave transmission line, there are mainly: waveguide, semi-rigid coaxial cable, flexible coaxial cable, microstrip line and millimeter wave coaxial connector as part of the transmission line.