TNC (abbreviated as Threaded Neill Concelman) connector is a threaded version of the BNC connector. TNC connector has impedance of 50 Ω and operates best within 0 to 11 GHz frequency spectrum. It has better performance as compared to BNC connector with microwave frequencies. TNC Connector was Invented in the late 1950s and named after Paul Neill and Carl Concelman and has been employed ever since in a wide range of radio and wired applications.
Reverse Polarity TNC
Reverse polarity TNC, RP-TNC or sometimes RTNC is a type of the TNC specification which reverse the polarity of the interfaces. This is usually done by incorporating the female contacts normally found in jacks into the male plug, and the male contacts usually found in plugs into the jack, shown in figure. As they were not readily available at times, RP-TNC connectors have been widely used by Wi-Fi equipment manufacturers to meet the terms with specific local regulations i.e. (FCC), which are designed to stop consumers from connecting antennas which show gain and consequently breach compliance. FCC considered that the RP-TNC was tolerable with stopping consumers changing the antenna; but it is regarded as readily available.
Mostly TNC connectors available with 50Ω impedance even when used with coaxial cable of other impedances, but a 75 Ω impedance series is also available, providing a good SWR to nearby 1 GHz. These can be acknowledged by a reduced amount of dielectric at the mating ends and are intermatable with standard types.