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Increased inductance values and contact resistance in connector contact surfaces due to degradation of connector contact performance have been reported.In particular, inductance increases while degradation remains minimal.We focus on a slight loosening in which increased inductance values are observed, without increased resistance values, and investigate the effect of loose connectors on transmission line coupling noise under such circumstances.We find a proportional relation between coupled noise current and frequency.Moreover, we find a proportional relationship between the increased inductance value, which depends on the change in connector contact distribution, and the coupled noise current in the transmission line.