An Rf coaxial connection adapter/Rf coaxial adapter is a basic product used for connecting instrument cables with different interfaces. It has the characteristics of wide frequency range and low standing wave ratio. It is a kind of electric coaxial radio frequency (RF) port of the device, they are usually placed at the end of the line of the radio frequency, designed to match the surge impedance of the cable (current voltage ratio), to help minimize signal reflection and power loss, the signal reaches the end of the cable absorption signal power, and to prevent noise signal is reflected back so as not to be.