RF coaxial connector, as an electrical connector designed specifically for megahertz level radio frequencies, is often used in conjunction with coaxial cables. High quality RF connectors can effectively reduce the fluctuation of transmission line impedance at the connection site.
The following is an introduction to 5 common appearance codes for RF coaxial connectors:
N-type: A threaded RF coaxial connector with an outer conductor inner diameter of 7mm (0.276 inches) and a characteristic impedance of 50 Ω (75 Ω). (IEC169-16)
BNC type: A bayonet locked RF coaxial connector with an outer conductor inner diameter of 6.5mm (0.256 inches) and a characteristic impedance of 50 Ω. (IEC169-8)
TNC type: A threaded RF coaxial connector with an outer conductor inner diameter of 6.5mm (0.256 inches) and a characteristic impedance of 50 Ω. (IEC169-17)
SMA type: A threaded RF coaxial connector with an outer conductor inner diameter of 4.13mm (0.163 inches) and a characteristic impedance of 50 Ω. (IEC169-15)
SMB type: outer conductor inner diameter of 3mm (0.12 inches), characteristic impedance
