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Performance Selection of RF Coaxial Connectors

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When purchasing an RF coaxial connector, you should not only care about the price but more importantly, consider the basic performance of the connector: mechanical performance, electrical performance, and environmental performance. Another important mechanical property is the mechanical life of the connector. Mechanical life is actually a durability index, which is called mechanical operation in the national standard GB5095. It takes one insertion and one unplugging as a cycle, and judges whether the connector can normally complete its connection function after the specified plug-in cycle.

1. Mechanical performance As far as the connection function is concerned, the insertion force is an important mechanical performance. The requirements for insertion and extraction forces are divided into the insertion force and extraction force. There are provisions for maximum insertion force and minimum separation force in the relevant standards, which shows that from the perspective of use, the insertion force should be small, and if the separation force is too small, it will affect the reliability of contact. The plug-in force and mechanical life of the connector are related to the coating quality of the contact part of the contact structure and the dimensional accuracy of the contact arrangement.

RF Coaxial Connector

2. Electrical performance The main electrical performance of the connector includes contact resistance, insulation resistance, and dielectric strength. For radio frequency coaxial connectors, there are electrical indicators such as characteristic impedance, insertion loss, reflection coefficient, and voltage standing wave ratio (VSWR). Due to the development of digital technology, in order to connect and transmit high-speed digital pulse signals, a new type of connector, namely a high-speed signal connector, has appeared. Accordingly, in terms of electrical performance, in addition to the characteristic impedance, some new electrical indicators have also appeared, Such as crosstalk, transmission delay, time lag, etc.

3. Environmental performance Common environmental performance includes temperature resistance, humidity resistance, salt spray resistance, vibration, and impact.

An important feature of coaxial connector technology that needs to be noted is that their power and voltage-related dielectric breakdown are much lower than waveguide interconnects of similar frequencies. If weight and cost are of high concern, this may be acceptable. However, the problems of material outgassing and material performance changes at high temperature and pressure may reduce the feasibility of coaxial technology in aerospace applications.

The above information is provided by the coaxial connector factory.