Influence of Corrosion on Signal Integrity of Connector

Taking the connector contact as the research object, this paper simulates and analyzes the influence of corrosion in the contact area on the signal integrity of the connector. Firstly, the simulation model of corrosive is established by using the three-dimensional electromagnetic simulation software CST, and then the influence of conductivity, dielectric constant and thickness of corrosive on the signal integrity of contact is simulated and analyzed in the frequency range of 0–15 GHz. The following conclusions were drawn in this paper: when the conductivity of corrosives is 1 × 10⁴ S/m, different dielectric constants have little effect on the signal integrity parameters; When the conductivity of corrosive is 1 S/m, the gradient of insertion loss and return loss decreases with the increase of the dielectric constant, and the gradient of input impedance decreases and the maximum value decreases. When the conductivity of corrosives is greater than or equal to 1 × 10² S/m, the signal integrity is very similar to, or even slightly better than that without corrosion. When the conductivity of corrosives is less than 1 × 10² S/m, The maximum value of return loss is almost unchanged, the minimum value of insertion loss decreases, and their frequency moves forward; The input impedance no longer meets the requirements of 100 ± 10 Ω; The signal integrity degrades sharply. When the thickness of corrosives is less than or equal to 0.0125 mm, the insertion loss is basically consistent with the model without corrosion; When the thickness of corrosives is greater than 0.0125 mm, the insertion loss is reduced by 0.06 dB compared with that without corrosion model; The maximum and minimum values of the input impedance increase with the increase of corrosion thickness.