RF connector is a kind of connecting device in RF transmission system, which can transmit RF signal with small loss and reflection, and provide fast and repeated connection. It is mainly composed of contact, insulator, shell and accessories.

With the rapid development of science and technology, the application scope of electronic equipment is becoming more and more extensive, which has penetrated into almost all departments of the national economy, including public security, communication, medical and other fields. Therefore, the reliability of electronic equipment has attracted more and more attention.

This paper mainly introduces some passive components on the communication link, and introduces the appearance, function, type, main technical index definition and scope of components.

1G realizes mobile call, 2G realizes SMS, digital voice and mobile Internet access, 3G brings picture based mobile Internet, and 4G promotes the development of mobile video. 5g network is regarded as the basis for the interconnection of things, vehicles and other things in the future.

There are many kinds of coaxial connectors: SMA, SMB, SMC, apc-7, K connector and so on. No matter what kind of connector you use, you should pay attention to its applicable frequency range before use.

RF coaxial cable is used to transmit RF and microwave signal energy. It is a distributed parameter circuit, and its electrical length is a function of physical length and transmission speed, which is essentially different from low-frequency circuit. RF coaxial cables are divided into three types: semi rigid and semi flexible cables. Different types of cables should be selected for different applications. Semi rigid and semi flexible cables are generally used for interconnection within equipment; In the field of testing and measurement, flexible cables should be used.

Terahertz (THz) wave refers to the electromagnetic wave with frequency in the range of (0.1-10) THz (wavelength 3000-30 microns), 1thz = 1012hz. It coincides with millimeter wave (submillimeter wave) in the long band, while terahertz wave occupies a special position in the electromagnetic wave spectrum in the short band. THz is located in the special position of electromagnetic spectrum. It has many superior characteristics and has very important academic and application value (some have been in practice), which has attracted great attention all over the world.