RF coaxial connector overview

       Coaxial connector (some people call it RF connector or RF connector. In fact, RF connector is not exactly the same as coaxial connector. RF connector is classified from the use frequency of connector, while coaxial connector is classified from the structure of connector. Some connectors are not necessarily coaxial, but are also used in the field of RF and coaxial connection        The connector can also be used in low frequency, for example, the very common audio headphone plug, the frequency is not more than 3MHz. From the traditional point of view, RF refers to the category of MHz, and the current coaxial connector is often used in the field of microwave, GHz, the word "RF" has been used, overlapped on the word "micro wave"), which is a branch of the connector, and there are similarities and particularity of the connector.
       The coaxial connector has inner conductor and outer conductor. The inner conductor is used to connect the signal wire, while the outer conductor is not only the ground wire of the signal wire (reflected on the inner surface of the outer conductor), but also plays the role of shielding electromagnetic field (shielding internal electromagnetic wave to external interference through the inner surface of the outer conductor, shielding external electromagnetic field to internal interference through the outer surface of the outer conductor), This feature gives coaxial connector a lot of space and structural advantages. The external and internal surfaces of coaxial connector are basically cylindrical - special cases are often required for mechanical fixation, and have a common axis, so it is called coaxial connector.
       Among the several forms of transmission lines, coaxial cable is widely used due to its outstanding advantages (simple structure, high space utilization, easy manufacturing, superior transmission performance, etc.), resulting in the need to connect the coaxial cable, so the coaxial connector is applied. Because of the advantages of coaxial structure, the continuity of characteristic impedance of (coaxial) connector (compared with other connectors) is more easily guaranteed. The transmission interference and EMI are very low, and the transmission loss is small, which is used in the field of radio frequency and microwave almost exclusively. Because it is used in high frequency almost absolutely, some electrical performance requirements are different from other connectors

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