Rf connectors are classified into three types: RF coaxial connectors, RF three-coaxial connectors, and two-core symmetric RF connectors.
1, RF coaxial: mainly used to transmit transverse electromagnetic wave (TEM wave);
2. RF triaxy: mainly used in occasions with higher requirements for shielding efficiency, transmitting transverse electromagnetic waves (TEM waves) or transmitting pulse waves;
3, double core symmetry: mainly used to transmit digital signals with low transmission rate.
RF coaxial connector types:
Ntype connector
Type N connector, threaded connection, rotatable locking. It was one of the first connectors capable of transmitting microwave frequency signals and was invented in the 1940s by Paul Neill of Bell Labs and named after Neill's initials. N-type connectors support signal frequencies ranging from 0 to 11GHz, and enhanced types can reach 18GHz. There are two types of characteristic impedances, 50 ohms (widely used in mobile communications, wireless data, paging systems, etc.) and 75 ohms (mainly used in cable TV systems).
BNC Connector
BNC connector is also one of the often seen RF connectors, is a small can achieve quick connection bayonet connector, BNC full name is Bayonet Nut Connector (buckle fit connector, this name figuratively describes the shape of this connector), the original meaning of BNC (Bayonet Neill – Concelman) is actually from 2 inventors, Paul Neill and Carl The initials of Concelman's surname, Paul Neill is also the inventor of the N-type connector. BNC connectors are widely used in wireless communication systems, televisions, test equipment, and other RF electronic devices, and BNC connectors were also used in early computer networks. The BNC connector supports a signal frequency range of 0 to 4 GHz. There are two types of characteristic impedances: 50 ohms and 75 ohms.
SMA Connector
SMA connector is a widely used small threaded connection coaxial connector, it has the characteristics of frequency bandwidth, excellent performance, high reliability, long life. SMA connector is suitable for connecting RF cables or microstrip lines in the RF loop of microwave equipment and digital communication systems, and is commonly used in GPS clock interfaces on single boards and test ports of base station RF modules on wireless devices. SMA, whose full name is SubMiniature version A, was invented in the 1960s. SMA connectors support signal frequencies ranging from DC to 18GHz, with some types supporting up to 26.5GHz. The characteristic impedance is 50 ohms.
SMB Connector
SMB full name is SubMiniature version B, is a small push-in locking RF coaxial connector, with small size, light weight, easy to use, excellent electrical performance and other characteristics, suitable for radio equipment and electronic instruments in the high-frequency loop to connect coaxial cables. It is often used on wireless devices to connect the base station DDF small transmission box with E1 transmission cable on the base station side. SMB connectors were invented in the 1960s and are smaller in size than SMA connectors. There are two types of characteristic impedances: 50 ohms and 75 ohms. Excellent electrical characteristics in the frequency range from DC to 4GHz. SSMB is a mini version of the SMB connector that can support up to 12.4GHz.
SMC Connector
The full name of SMC is SubMiniature version C, which is also an RF coaxial connector invented in the 1960s. It features a #10-32 UNF threaded interface that provides excellent electrical performance from DC to 10GHz. The SMC male has an external thread and the SMC female has a matching nut. There are two types of characteristic impedances: 50 ohms and 75 ohms, which provide interconnection for small coaxial cables and printed circuit boards that are very concerned about size.
F Type Connector
F-type connector is a radio frequency connector that everyone will see in daily life, widely used in cable TV, satellite TV, cable TV modem and TV connection and other fields. It can be used in the case of impedance matching requirements, and can also be used in non-matching places, which is characterized by threaded connection and convenient insertion. Stable performance. The F-type connector was invented by Eric Winston in the early 1950s and became a common connection connector for VHF TV antennas in the United States in the 1970s. F-type connectors are very inexpensive, with a characteristic impedance of 75 ohms, and the highest frequencies can generally support up to 1GHz or 2.4GHz.
RCA Connector
RCA is an abbreviation for Radio Corporation of American because RCA joints were invented by this company in the 1940s. RCA is commonly known as Lotus socket, also known as AV terminals, AV interface, almost all televisions, DVD player products have this interface. It is not specifically designed for any kind of interface, which can be used for both audio and ordinary video signals. Typical carrier signal ranges from 0-100MHz.
7/16 DIN Connector
DIN type (also known as 7/16 or L29) series coaxial connector is a large 50 ohm impedance threaded connector, with strong and stable, low loss, high working voltage characteristics, and most of them have a waterproof structure, can be used outdoors as a connector for medium and high energy transmission, widely used in microwave transmission and mobile communication systems. Commonly used in base station feeder connectors, antenna connectors, etc. DIN is an abbreviation of the German Institute for Standardization and is a series of connector standards developed by it. DIN connectors are very similar to N-type connectors, with a large DIN head diameter, about 2 times the diameter of N headers.
TNC Connector
TNC is an abbreviation for Threaded Neill–Concelman, is it a bit familiar to see Neill–Concelman, by the way, TNC's NC is the same as BNC's NC, that is, having the same inventor. The TNC connector is a variant of the BNC connector that uses a threaded connection. The characteristic impedance is 50 ohms and the optimal operating frequency range is 0-11GHz. In the microwave band, TNC connectors perform better than BNC connectors. It has the characteristics of strong vibration resistance, high reliability, excellent mechanical and electrical properties, etc., and is widely used in radio equipment and electronic instruments to connect RF coaxial cables.
UHF Connector
This joint has a long history and has been used since the period before World War II. Its other name, "UHF connector", comes from the definition of UHF at the time (frequencies above 30MHz are UHF frequency ranges). Now the test of this connector shows that its characteristics are mainly suitable for frequency use around 100MHz and below. This is what is now commonly referred to as the VHF band.
The most notable feature of this connector is a thicker center conductor (about 4mm thick) in the middle of the plug. The connection and fixing is made by means of the internal thread on the connector and the external thread on the socket. This plug is not waterproof, so special care should be taken when erecting outdoors to the effects of natural conditions such as rainwater.
MCX Connector
Invented in the 1980s, the MCX connector has the same internal contacts and insulator dimensions as SMB connectors, but is 30% smaller than SMBs. The full name of MCX is Mirco Coaxial. The relevant standards are specified in CECC 22220 in Europe. Since the MCX connector adopts a push-in connection method, this makes the connection and separation of the connector very fast, shortening the installation time of the connector. MCX connectors still have good electrical performance at frequencies up to 6GHz, and can also be adapted to a variety of cables, including semi-rigid cables and flexible cables, with reliable connections and long life.
