SMB connector

- details and information about the SMB connector - a useful RF connector- including the SMB socket and plug, SMB adapters and links to suppliers.

The SMB connector derives its name as it is termed a Sub-Miniature version B connector. It was developed as a result of the need for a connector that was able to connect and disconnect swiftly. It does not require nuts to be tightened when two connectors are mated. Instead the connectors are brought together and they snap fit together. Additionally the connector utilizes an inner contact and overlapping dielectric insulator structures to ensure good connectivity and a constant impedance.

The SMB connector is not as robust as the SMA connector, and although they perform well under moderate levels of vibration, they are not suitable for harsh environmental conditions where the levels of vibration rise.

SMB connector impedance

The SMB connector is specified in tow impedances, namely 50 and 75 ohms. The 50 ohm version of the SMB connector is generally specified up to 4 GHz, but the 75 ohm versions of the SMB connector are normally only specified to 2 GHz.

SMB applications

SMB coaxial connectors are not as widely used as their SMA counterparts. They are used for inter board or assembly connections within equipment, although they are not widely used for purchased microwave assemblies in view of their inferior performance.

Although the SMB connector is not as widely used as its SMA cousin, large quantities are nevertheless used. The connector is much easier to connect and this can be a distinct advantage in applications where its performance is sufficiently good. As a result the SMB connector is a very successful design and used for many applications.

By Ian Poole

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