Impact of trace spacing on noise coupling for guard trace in stripline structure

This work investigates how the noise coupling is affected for a guard trace with different trace spacings in stripline structure. For a guard trace maintaining the same trace separation, although reducing crosstalk noise can achieve good efficiency, a guard trace with different trace spacings induces residual crosstalk voltage on the guard trace. Residual crosstalk voltage can be regarded as a main signal and capable of inducing a significant amount of extra crosstalk noise at both the near end and far end on the victim line. To address this issue, 3D full-wave simulation is performed. Compared to the same trace spacing, due to the different trace spacings, the increasing amount of magnitude of time-domain crosstalk noises exceeds 70 % on the victim line. Additionally, in the frequency domain, the increasing amount of magnitude of the first and largest resonant crosstalk peak at about 1GHz is more 25dB.