BNC Connector

What is an RF connector?

An RF connector is an electrical interface developed to work at multi-megahertz radio frequencies. They are used with coaxial cables where they are designed to maintain the cables’ shielding. Mechanically, RF connectors use a fastening system to facilitate a low ohmic electric contact, sparing the gold surface at the same time. This feature allows for more than a thousand reconnections and a reduction to the insertion force.

What is a BNC connector?

A Bayonet Neill Concelman, or BNC, connector is a universal type of RF connector mounted at the end of coaxial cables. Its fastening tool uses mated terminals consisting of a male and a female side with matching slots.

Uses of a BNC Connector

A BNC connector is used in the following applications and technologies:

  • Connections using RF signals;
  • Serial digital and Analog interface;
  • Video signals;
  • Aviation electronics;
  • Non-professional radio antenna connections; and
  • Electronic test equipment.

BNC connectors also function as a substitute to RCA connectors when used for video on commercial video devices.

BNC Specifications

There are two versions of BNC connectors. These are the 50 and 75-ohm versions. These designs were to mate with each other, although the impedance difference could lead to signal reflections.

The 50-ohm versions, which were originally the only versions available, were matched with cables of different impedances. The 75-ohm versions have reduced or missing dielectric at the mating ends. These are typically for frequencies up to 4 GHz.

Similar Connectors

  • The TNC connector, or the threaded Neill-Concelman connector, is a threaded version of a BNC connector. It has 50 Ω impedance and best operates at the 0-11 GHz frequency spectrum. It performs better than a BNC connector in microwave frequencies performs, and can be used in a variety of radio and wired applications.
  • LEMO 00 miniature connectors have replaced BNC connectors in their application with NIM electronics because the former provides for higher densities. Likewise, MHV and SHV connectors are for higher voltages.
  • Like an ordinary BNC connector, a twin BNC connector also uses a bayonet latching shell. However, the latter contains a female and male contact points, thus allowing the connection of a 78-ohm and a 95-ohm shielded differential pair. Nonetheless, regular DNC connectors cannot match with Twin BNC connectors.
  • Triaxial connectors are BNC variants that feature both a signal and guard, and a ground conductor. It also incorporates a three-lug arrangement to guard against accidental or forced mating with BNC connectors. This type of connector is used in sensitive electronic measurement systems.

For more information on BNC Connector read:

  • BNC Connector
  • BNC Connector