Abstract: S-parameters of Sub-Miniature-A (SMA) coaxial connector was calculated based on the equivalent circuit method, the high frequency characteristics of the connector effectively was simulated thereafter. Especially for the case of connector contact degradation, the parameters in the equivalent circuit model were calculated, and the relationship between the S-parameter and degraded level was established. The developed model could be used as a fault feature for the life prediction, reliability evaluation and fault diagnosis of the connector.

Key words: coaxial connector, contact degradation, S parameters, equivalent circuit