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RF coaxial connector basic overview


The RF coaxial connector is an electromechanical component that connects the electrical circuit and serially makes the transmission line electrically connect or segment. It belongs to a mechatronic product with complicated mechanism of mutual interference. RF coaxial connectors are also known as RF connectors. "R" is the first letter of RADIO (radio), and ‘F’ is the first letter of FREQUENCY.

An RF coaxial connector (hereinafter referred to as an RF connector) is generally considered to be an element attached to a cable or mounted on an instrument as an electrical connection or separate component of the transmission line. It is a mechatronic product. Simply speaking, it mainly serves as a bridge.

The UHF connector that appeared in 1930 was the original RF connector.

During the Second World War, due to the urgent need for war, through the development of radar, radio and microwave communications, N, C, BNC, TNC, and other medium-sized series were produced. After 1958, small-scale products such as SMA, SMB, and SMC appeared. In 1964, the US military standard MIL-C-39012 "General Specification for RF Coaxial Connectors" was established. Since then, RF connectors have begun to develop in the direction of standardization, serialization, and generalization.

Over the past 80 years, through the joint efforts of experts and engineers from all over the world, RF connectors have formed an independent and complete professional system, which has become an important part of the connector family and an indispensable key to the coaxial transmission system. element.

The RF connector development technology of the United States, Britain, France and other countries/regions is in a leading position. Its design, production, testing and use technology have been complemented by Jackie Chan, and it has become perfect, forming a complete standard system, and raw materials, transmission materials, testing. Systems, assembly tools, etc. have also been standardized and produced on a professional scale, with a high degree of automation.

RF coaxial connector professional features

(1) Variety of specifications: more than 50 international general series, more varieties and specifications.

(2) It is an electromechanical integration product by mechanical structure to ensure electrical characteristics, which is essentially different from other low frequency connectors.

(3) The machining of parts is mainly machining of turning machines. There are many manual operations and it is difficult to carry out automatic assembly.

(4) Product update is slow.

(5) It is an important part of the electrical connector and belongs to labor-intensive products with certain technical content.

(6) Product reliability, failure mode and failure mechanism are complex.

RF coaxial connector development trend

(1) miniaturization

With the miniaturization of the whole system, the size of the RF connector is getting smaller and smaller, such as SSMB, MMCX and other series, the volume is very small.

(2) High frequency

HP has introduced RF connectors with frequencies up to 110 GHz a few years ago. The domestic general product use frequency does not exceed 40GHz. The frequency of the flexible cable is not more than 10 GHz, and the semi-rigid cable is not more than 20 GHz.

(3) Multifunctional

In addition to the role of the bridge, it also has the function of processing signals, such as filtering, phase adjustment, mixing, attenuation, detection, and limiting.

(4) Low standing wave, low loss

Meet the needs of weapon systems and precision measurements.

(5) Large capacity, high power

Mainly adapted to the development needs of the information superhighway.

In the past 20 years, the communication industry has grown rapidly, and the RF connector market has seen an unprecedented development momentum. The RF connector usage has increased by about 20% per year. It is the most competitive product in the electronic component market, the most active in the market and the most exportable. One.

The RF coaxial connector is a transmission system in which the inner and outer conductors are centered on the same axis, and the inner and outer conductors are supported by an insulating medium. The function of the radio frequency coaxial connector is to transmit various types of radio frequency electromagnetic field signals and connect various subsystems of the communication system. Or it acts as a signal connection between the devices. It is a passive port component of a communication system.

The coaxial transmission system has obvious advantages in transmitting electromagnetic field signals. The inserted external conductor has an almost perfect effect. The electromagnetic energy surrounds the center conductor, and a single pure rotating electromagnetic field means that the system is fully utilized. Geometric construction, constant impedance, and excellent broadband characteristics (ie, the frequency band can be used from DC to tens of GHz or even higher depending on the structure).

Each series of RF coaxial connectors has a unified port to facilitate mutual conversion and interleaving. The other end can be mated with printed circuit boards, microstrip lines, strip lines, cables, various active passive devices, and antennas. , the signal is transmitted between different terminals.

The main application of RF connectors:

1, communication, communication and network

Including satellite communications, radar, aircraft, long-distance telecommunications, microwave relay stations, mobile phones, mobile phone base stations, television signals.

2, medical

Including robotic microwave scalpel, pathological graphic imaging system, microwave radiation therapy instrument and so on.

3, traffic monitoring system

4. Seed irradiation equipment, harmless treatment equipment for aquaculture waste, etc.

5, remote sensing telemetry

Radio telescope, space station telemetry equipment.

6, instrumentation

In short, due to the product and technical characteristics of RF connectors, it can be widely used in automobiles, information communication, communication broadcasting, security systems, civil aviation, communication networks, consumer electronics, defense military, instrument testing, medical, aerospace, transportation, antennas. , microwave components, RF microwave switches and other occasions and equipment.

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