It is also important that RF coaxial cable connectors have a characteristic impedance that matches that of the cable. The UHF connector, also sometimes known as the Amphenol coaxial connector was designed in the 1930s by a designer in the Amphenol company for use in the radio industry. These coaxial connectors have a threaded coupling, and this prevents them from being removed accidentally. The N-type connector is a high performance RF coaxial connector used in many RF applications.
The N-type coaxial connector is used for many radio frequency applications including broadcast and communications equipment where its power handling capability enables it to be used for medium power transmitters, however it is also used for many receivers and general RF applications. The BNC coax connector is widely used in professional circles being used on most oscilloscopes and many other laboratory instruments, although it is widely used for many other RF applications.
Like the BNC connector, the TNC connector has a constant impedance, and in view of the threaded connection, its frequency limit can be extended.
This sub-miniature RF and microwave coaxial cable connector takes its name from the words Sub-Miniature A connector. The connectors have a threaded outer coupling interface that has a hexagonal shape, allowing it to be tightened with a spanner. A third SM type connector is not surprisingly the Sub Miniature C or SMC coaxial cable connector. A number of mico-miniatiure RF connectors have been developed by a variety of manufacturers to meet the growing demand for cost effective, high quality smaller connectors. The MCX connector is normally specified for operation up to 6 GHz, and it finds applications in a variety of arenas including equipment for cellular telecommunications, data telemetry, Global positioning (GPS) and other applications where size and weight are important and frequencies are generally below 5 GHz. The connector provides a snap fitting and also utilises a slot-less design to minimise leakage.
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Wherever radio frequency or RF connections need to be made there is the possibility of using coaxial connectors.

In order that the maximum power transfer takes place from the source to the load, the characteristic impedances of both should match. Impedance, frequency range, power handling, physical size and a number of other parameters including cost will determine the best type for a given applications. The plug may be referred to as a PL259 coaxial connector, and the socket as an SO239 connector.
It also enables them to be tightened sufficiently to enable a good low resistance connection to be made between the two halves.
This coax connector was designed by Paul Neill of Bell Laboratories, and it gained its name from the first letter of his surname. The BNC connector has a bayonet fixing to prevent accidental disconnection while being easy to disconnect when necessary.
It was developed as a result of the need for a connector that was able to connect and disconnect swiftly. They are used for inter board or assembly connections within equipment, although they are not widely used for purchased microwave assemblies in view of their inferior performance. It is similar to the SMB connector, but it uses a threaded coupling interface rather than the snap-on connection. These are finding high levels of use, for example in the cellular phone industry, where size, cost and performance are all important. Being some 45% smaller than an SMB connector, the MMCX is ideal where a low profile outline is a key element. The list above describes some of the more popular types of RF connector, but there are nevertheless more varieties available.
Where signals reach frequencies above a few million Hertz, these coaxial connectors need to be used. This RF connector was developed in the late 1940s and it gains its name from a combination of the fact that it has a bayonet fixing and from the names of the designers, the letters BNC standing for Bayonet Neill Concelman.
It is often used for providing RF connectivity between boards, and many microwave components including filters, attenuators, mixers and oscillators, use SMA connectors. However its use extended to other flexible cables, and connectors with centre pins were introduced.

This provides a far superior interface for the connection and as a result, SMC coaxial cable connectors are normally specified to operate at frequencies up to 10 GHz. In view of their performance they find applications in microwave equipment, although they are not normally used for military applications where SMA connectors tend to be preferred. In fact the MCX is about 30% smaller in both size and weight than an SMB connector to which it has many similarities. The MCX connector has many similarities with the construction of the SMB connector using a quick snap-on interface, and utilising an inner contact and an overlapping dielectric insulator structure.
It is therefore ideal for applications where board height is limited, including applications where boards may be stacked. When choosing a coaxial cable connector, the requirements should be carefully matched to the available options to see which RF connector will provide the best choice.
The need for their use arises because it is necessary to transfer radio frequency, RF, energy from one place to another using a transmission line. In fact the BNC connector is essentially a miniature version of the C connector which was a bayonet version of the N-type connector. As the bayonet fixing moved slightly there were small changes to the resistance of the connections and this introduced noise. In this way the best compromise between size, weight, performance and cost can be achieved. The most convenient, and hence the most commonly used form of transmission line is coaxial cable which consists of two concentric conductors, an inner conductor and an outer conductor, often called the screen. To solve the problem a screw fixing was used and the TNC coax cable connector gains its name from the words Threaded Neill Concelman.
Additionally the connector utilizes an inner contact and overlapping dielectric insulator structures to ensure good connectivity and a constant impedance.

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