Connectors are also often called connectors in the industry. They refer to devices that connect two active devices to transmit current or signal. However, we usually need to understand the classification of connectors to choose what we want to buy more clearly. The following are three categories of connectors:

1. According to technical development and actual situation, it can be divided into low-frequency circular connector, rectangular connector, printed circuit connector, RF coaxial connector, optical soldering connector, etc

2. According to the shape and structure, it can be divided into circle and rectangle

3. According to the working frequency, it can be divided into low frequency and high frequency

Through the above division, it is not difficult to know that the coaxial connector is circular, and the printed circuit connector is rectangular. Historically, the printed circuit connector is indeed separated from the rectangular connector. At present, the popular rectangular connector has a ladder section, which is more like a rectangle. The frequency division can be divided into low frequency, high frequency and radio wave based on 3MHZ.