Although the division of connector product types is somewhat confusing, from a technical point of view, there are only two basic division methods for connector product categories:

① According to the shape structure: round and rectangular (cross section);

② According to the operating frequency: low frequency and high frequency (with 3MHz as the boundary).

According to the above division, the coaxial connectors belong to the circle, and the printed circuit connectors belong to the rectangle (from a historical point of view, the printed circuit connectors are indeed separated from the rectangular connectors into one category), and the current popular ones The cross-section of the rectangular connector is trapezoidal, which is similar to a rectangle. The division of low frequency and high frequency with 3MHz as the boundary is basically the same as the frequency division of radio waves.

As for other types, they can be divided into many different types according to their use, installation method, special structure, special performance, etc., and often appear in publications and manufacturer's publicity materials, but generally only to highlight a certain feature and use, the basic classification is still The above-mentioned division principle is not exceeded.

Considering the technical development and actual situation of connectors, connectors can be divided into the following categories (categories) from their versatility and related technical standards:

①Low frequency circular connector;

②Rectangular connector;

③ Printed circuit connectors;

④ RF coaxial connector;

⑤ Optical fiber connector.