Coaxial termination connectors (hereinafter referred to as RF connectors) are usually considered as components installed on cables or instruments, serving as electrical connections or separation components for transmission lines. It belongs to the category of electromechanical integration products. Simply put, it mainly serves as a bridge.

　　Compared with other electronic components, the development history of RF connectors is relatively short. The UHF connector that emerged in 1930 was the earliest RF connector. During World War II, due to the urgent need for war, with the development of radar, radio, and microwave communication, medium-sized series such as N, C, BNC, TNC, etc. emerged. After 1958, miniaturized products such as SMA, SMB, and SMC emerged. In 1964, the US military standard MIL-C-39012 "General Specification for Coaxial Termination Connectors" was formulated. From then on, RF connectors began to develop towards standardization, serialization, and generalization.

　　Over the past sixty years, with the joint efforts of experts from various countries, RF connectors have formed an independent and complete professional system, becoming an important component of the connector family. It is an indispensable key component of coaxial transmission systems. The research and development technology of RF connectors in countries such as the United States, the United Kingdom, and France is in a leading position. Their design, production, testing, and usage technologies have been completed and tend to be improved. Not only has a complete standard system been formed, but raw materials, auxiliary materials, testing systems, assembly tools, etc. have also been standardized and professionally produced on a large scale.

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