October 2020 / Chin Nan® Precision Electronics Co., Ltd.We are a manufacturer of electronic components. The main products are connectors and adapters and related cables.

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October 2020

connector-type

October 2020

Connector interface type and application


Coaxial connectors are also commonly referred to as RF connectors, although most connectors are used in the microwave range.

1. Standard(Standard)
2. Miniature (small)
3. Sub- Miniature (subminiature)
4. Micro-Miniature (Micro-Miniature)

The above four types represent the development of the design concept of the coaxial connector from 1930 to 1980. In the early days, the coaxial cable used was much larger than today's, so the "standard" connectors belonged to the larger and earlier designs, while the "subminiature" and "micro-miniature" connectors belonged to the larger and earlier designs. "The connectors are smaller in size and more advanced in design.

The "UHF" connector was designed and invented by E. Clark Quackenbush of Amphenol (a major manufacturer of connectors) in 1930 and used in radio broadcasting systems. The cable lock-in type is called PL-239 connector.
"Since the impedance is not constant, its frequency is limited to 300 MHz and is usually classified as a low-cost connector. "UHF connectors are mainly used in low-frequency communication equipment such as CB radio and public communication systems.

The "N" connector is designed by Paul Neill of bell labs and is the first true microwave frequency range connector. The "N" connector is threaded for interface coupling and has a standard impedance of 50 Omega. A 75 Omega impedance connector is also available, which is the same as the 50 Omega connector. The "N" type connector with 50 Omega impedance is designed to operate at 11GHz, while the "N" type connector with more precise design can operate at 18GHz, but it is not commonly used. Applications for the "N" connector include local area networks (LANs), test equipment, broadcast, satellite and military communications equipment.

"The most commonly used coaxial connector is the "BNC" connector, which was developed in 1940. Bayonet" means Bayonet-Neill-Concelman. Bayonet is a mechanical description of interface coupling. Neill and Concelman are the inventors of the "C" type connector and the "N" type connector.

"The "BNC" connector is a reduced size version of the "C" type connector, while the "C" type connector is a flanged structure of the "N" type connector. The "BNC" connector is designed with two types of impedance, 50 Omega and 75Omega , which can be compatible with each other without damaging the structure.

The "TNC" connector was developed in 1950.
TNC" means "Threaded-Neill-Concelman". "TNC" connector is a 50 Omega "BNC" connector changed to
Threaded interface coupling design, operating frequency up to 11GHz; "TNC" connector can be used in vibrating environments.
It is often used in military and aviation applications.

The "SMA" (Sub-Miniature-A) connector was originally designed to fit the .141 semi-rigid cable (RG-402).
Some of the more sophisticated "SMA" connectors can operate at frequencies as high as 26.5GHz; as for "SMA" connectors with cables, the "SMA" connector is designed for 50 Omega impedance and coupled with a threaded interface. The maximum frequency of SMA connectors is determined by the type of cables to be installed. Suitable microwave system components include amplifiers, attenuators, filters, mixers, oscillators, switchgear, and more.

The "SMB" (Sub-Miniature-B) connector is a sub-miniature connector developed for quick connection and disconnection. The structure has a shrapnel between the body and housing and an overlapping insulator, which makes it easy to bite the connector and has good working efficiency under moderate vibration. "There are two types of SMB 75-ohm impedance connectors, one of which cannot be connected to the MIL-C-39012/SMB (50-ohm) design (BT43, BT43, BT43). (SMZ), which is generally used for internal signal transmission including RF and digital signals.

"The SMC (Sub-Miniature-C) connector is similar in design to the SMB, with the same center and overlapping insulating structure, but the SMC uses a threaded coupling instead of a spring bite contact.

The "MCX" (MicroCoaX) connector was developed in Europe in 1980. Like the "SMC" connector, the "MCX" connector is designed and mechanically structured. Both are similar to the SMB connector, with the same center and overlapping insulating structure and the same coupling interface by means of spring bite. On the other hand, despite the opposite design of the spring coupling, the SMB connector operates just as reliably as the SMB connector, but is about 30% smaller and lighter than the SMB connector. "MCX" connectors can be used at frequencies up to 6GHz and are used in the same applications as conventional "SMB" connectors, but are suitable for smaller and lighter applications. (G.P.S.), mobile phone, cellular phone and data transmission.