Five ways to choose radio frequency sma connector
1. Interface mechanism type
The connection mechanism of the connector is not only to provide convenient and fast connection or separation of the coaxial transmission line, but also to provide stable electrical performance and environmental protection devices. When there is not enough space to rotate the connecting nut in the use occasion, a non-twist type connection should be selected. mechanism. In addition, for frame connectors, non-twisting connection mechanisms are also very useful.
2. Electrical performance
a. Characteristic impedance: The connector should match the impedance of the transmission system and cable, otherwise it will cause the system performance to decline;
b. Withstand voltage: the maximum withstand voltage of the connector should meet the withstand voltage requirements of the system;
Generally speaking, if it is a wideband application, some favorable broadband impedance matching characteristics should be sacrificed to obtain the required high voltage rating.
c. Maximum work efficiency.
3. Cable connection method and cable type
a. Cable connection: There are two ways to connect the connector cable: one is welding the center conductor, and the standard tightening method of combing the braided wire is still common, especially suitable for occasions without special installation tools, and convenient for on-site maintenance. two. The clamping method of welding the center conductor and crimping the braid. Because of the high working efficiency of the crimping method. Reliable termination performance and good consistency have become a common method today.
b. Cable type: The appropriate connector should be selected according to the characteristics of the various cables used (such as flexible cables, semi-rigid cables, corrugated conductor insulated cables, foam insulated cables). Generally, cables with small outer diameters are matched with small connectors.
4. Termination form
Connectors can be used for radio frequency coaxial cables, printed circuit boards, machine frame drawer type functional components and their connection interfaces.
5. Material and coating
The outer shell and inner conductor are mainly brass, beryllium copper, tin bronze, and the insulating material is mainly tetrafluoroethylene.
The center conductor is generally plated with silver or gold, and the outer shell is plated with nickel or silver.
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